44
OUTLOOK: HYDRO IN EUROPE 24 TACKLING GEOTECH CHALLENGES IN THE HIMALAY AS 26 SMALL HYDRO DEVELOPMENT 35 TLOOK: HYDRO IN EUROPE O ACKLING GEOTECH CHALLENGES IN THE HIMALA Y AS 26 MALL HYDRO DEVELOPMENT 35 www.hydroworld.com Connecting The Worldwide Hydro Community July 2009 Contents | Zoom in | Zoom out Search Issue | Next Page For navigation instructions please click here Contents | Zoom in | Zoom out Search Issue | Next Page For navigation instructions please click here

HRW_20090701_Jul_2009

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Page 1: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 144

OUTLOOK HYDRO IN EUROPE 24

TACKLING GEOTECH CHALLENGES

IN THE HIMALAYAS 26

SMALL HYDRO DEVELOPMENT 35

TLOOK HYDRO IN EUROPEO

ACKLING GEOTECH CHALLENGES

IN THE HIMALAYAS 26

MALL HYDRO DEVELOPMENT 35

wwwhydroworldcom

Connecting The Worldwide Hydro Community July 2009

ntents | Zoom in | Zoom out Search Issue | Next PageFor navigation instructions please click here

ntents | Zoom in | Zoom out Search Issue | Next PageFor navigation instructions please click here

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 244

Visit us at Waterpower XVI Booth 901

httphrwhotimscom RS 1

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_______________

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wwwhydroworldcom July 2009 HRW 1

JULY 2009

WIND-HYDRO INTEGRATION

ARTICLES

24 Hydropower in EuropeCurrent Status Future Opportunities By Marla J Barnes

For hydro the European Unionrsquos current push to increase use of renewables translates to

signi1047297cant growth in the development of new capacity and in upgrading of existing facilities

26 Project Development in the HimalayasSolving Geotechnical Challenges

By Imran Sayeed

During hydro project construction in the Himalayas Indian

utility NHPC Limited has faced multiple geotechnical challenges

To overcome these the company has implemented a number

of solutions including providing adequate reinforcement for

rock slopes and choosing tunneling practices to best deal with

the rock conditions

DEPARTMENTS

ADVISORY BOARD

H Irfan AkerDolsar Engineering

Limited Turkey

Ian M CookICCL United

Kingdom

Chris HeadChris Head amp Associates

United Kingdom

Leonard B KassanaEast African Tea

Trade AssociationKenya

Peter Thomas MulvihillPioneer Generation Ltd

New Zealand

Raghunath Gopal(RG) Vartak

AFCONS InfrastructureLimited India

EmmanuelAntwi-Darkwa

Volta River AuthorityGhana

Arturo GilGarcia

IberdrolaGeneration

Spain

Liu HengInternational Network on

Small Hydropower(IN-SHP) PeoplesRepublic of China

Carlos Alberto KnakiewiczItaipu Binacional

Brazil

Montri Suwanmontri PhDDr Montris amp Associates

Thailand

Luis C VintimillaConsulting Engineer

Ecuador

Zhang BotingChinese Society for

Hydropower EngineeringPeoples Republic of

China

Roger GillHydro Focus

Pty LtdAustralia

Zhang JinshengChina Yangtze

Three Gorges ProjectPeoples Republic of

China

Dr Terry MossEskom Generation

South Africa

CVJ VarmaCouncil of Power Utilitiesand The Dams Society

India

James Yang PhDVattenfall Research

and Development ABSweden

2 Viewpoint Hydro and Wind Power

4 Briefings

34 New Hydro

35 Small Hydro

40 Index to Advertisers

12 Pumped Storage Supports Wind Energy

By Fernando Peraacuten Montero and Juan J Peacuterez

Spanish utility Iberdrola isbuilding the 852-MW La Muela 2pumped-storage plant to help 1047297rmthe variability of its more than4200 MW of wind capacity

26

12

Peer Reviewed

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In the world of renewable energy news from 2008 includes the fact of wind pow-

errsquos continued rapid growth Wind added 29 GW during the year Hydropower

also added capacity in this same range mdash 25 to 30 GW

In four years worldwide wind capacity has grown by a factor of 25 times

from 48 GW in 2004 to 121 GW in 2008 mdash an annual growth rate of 26 This

is higher than the growth rate of any other electricity source Three countries mdash

Germany Spain and the United States mdash now host more than half of the worldrsquos

wind capacity And China and India in 4th and 5th place are both adding wind

power at a terri1047297c pace

Hydropower facility owners operators and developers need not worry about

hydro being displaced by wind power or by other new renewable energies or any

other power source The world needs all the electricity it can get mdash especially

renewable energy And where hydro projects are feasible they deliver solid value

Hydro often is a low-cost source of electr icity that provides long-term support for

regional economies Moreover the long life reliability and durability of hydro

projects often provide a bonus Many types of power projects including wind

projects will not endure beyond a 20- or 30-year life Yet after 30 years the

typical hydro project has hardly reached the middle of its li fe

Because the worldwide installation rates of wind and hydro are about the same

gigawatt per gigawatt it could seem fortuitous that new hydro could ldquobalancerdquo

the intermittency of new wind installations Indeed among the top 1047297ve wind-

power countries Spain China and India are rapidly adding hydro and these ad-

ditions aid them in successfully integrating wind power into their electricity grids

Other countries are not so lucky Ireland for example is adding wind power and

is experiencing integration challenges Within Ireland and many other countries

the opportunities for using hydro to support integration are limited

We cannot get too much hydro and wind power To put energy needs in per-

spective what if all of the new demands for electricity in the past ten years had

been provided from hydro and wind (or other renewables) (And please keep

in mind that electricity provides but a fraction of total energy supplies) Over

the decade the 40 addition to total electricity generation added about 6000

terawatt-hours of energy per year To supply this much electricity from hydro

and wind power additions would have required total annual capacity additions

totaling 150 to 200 GW hellip or about three times as much as was installed in 2008

a banner year While these levels of addition may not be beyond possibility they

are de1047297nitely a far stretch from where we are today Itrsquos hard to imagine getting

enough of either hydro or wind

Editor Emeritus

2 HRW July 2009 wwwhydroworldcom

V i e w p o i n t

Hydro and Wind Power

Vol 17 No 3 July 2009

1421 South Sheridan RoadTulsa OK 74112PO Box 1260 Tulsa OK 74101

Telephone (918) 835-3161Fax (918) 831-9834

E-mail hydroreviewpennwellcomWorld Wide Web httpwwwhydroworldcom

PUBLISHER AND CHIEF EDITOR mdash Marla Barnes(816) 931-1311 ext106 marlabpennwellcom

SENIOR ASSOCIATE EDITOR mdash John Braden(816) 931-1311 ext123 johnbpennwellcom

ASSOCIATE EDITOR mdash Elizabeth Ingram(816) 931-1311 ext125 elizabethip ennwellcom

PRESENTATION EDITOR mdash Kermit Mulkins(918) 831-9554 kermitmpennwellcom

CONTRIBUTING EDITOR mdash James L Gordon BSc

CONSULTANTS ADVISORS mdash Leslie Eden and Carl Vansant

SUBSCRIBER SERVICE

PO Box 3264 Northbrook IL 60065-3264Customer Service 847-559-7330

Fax 847-291-4816Email hrwomedacom

MARKETING MANAGER mdash Ashley Wood(918) 832-9326 ashleywpennwellcom

GROUP PUBLISHER NORTH AMERICAN RENEWABLE ENERGY GROUP

Dick Rauner mdash (918) 832-9249 dickrpennwellcom

SR VP POWER GENERATION mdash Richard G Baker(918) 831-9187 richardbpennwellcom

SALES DIRECTOR mdash Howard Lutzk

(816) 931-1311 ext109 howardlpennwellcom

CORPORATE HEADQUARTERS mdash PennWell Corp1421 S Sherid an Road Tulsa OK 74112

Telephone (918) 835-3161

CHAIRMAN mdash Frank T LauingerPRESIDENT CEO mdash Robert F Biolchini

CHIEF FINANCIAL OFFICER SENIOR VICE PRESIDENT mdash Mark C Wilmoth

AUDIENCE DEVELOPMENT MANAGER mdash Emily Martha MartinSR VP AUDIENCE DEVELOPMENT amp BOOK PUBLISHING mdash Gloria Adams

PRODUCTION DIRECTOR mdash Charlie ColePRODUCTION MANAGER mdash Dorothy Davis

HRW (ISSN 1072-9542) is published six times in March May July Sep-

tember October and December by PennWell Corp 1421 S Sheridan Rd

Tulsa OK 74112 phone (918) 835-3161 Printed in USA Canad ian GST

Registration Number 12681 3153 RT0001 Canada Post International

Publications Mail Product (Canadian Distribution) Publications Agree-

ment No 40029359 Copyright 2009 by PennWell Corp (Registered i n

US Patent Trademark Of1047297ce) No part of this periodical may be repro-duced without the consent of the publisher Authorization to photocopy

items for internal or personal use or the i nternal or personal use of speci1047297c

clients is granted by HRW ISSN 1072-9542 provided that the appro-

priate fee is paid directly to Copyright Clearance Center 222 Rosewood

Drive Danvers MA 01923 USA 508-750-8400 Prior to photocopying

items for educational classroom use please contact Copyright Clearance

Center 222 Rosewood Drive Danvers MA 01923 USA 508-750-8400

Periodicals postage paid at Tulsa OK and additional mailing of1047297ces An-

nual subscription rate US$44 per year Single copies US$20 Payments

accepted in US funds only HRW is a subscriber to Reuters and Business

News Americas news services and incorporates their copy in its news col-

umns POSTMASTER Send change of address other circulation infor-

mation to HYDRO REVIEW PO Box 3264 Northbrook IL 600 65-3264

ldquoHRW rdquo is a registered trademark of PennWell Corp Return undeliver-

able Canadian addresses to PO Box 122 Niagara Falls ON L2E 6S4

PRINTED IN THE USA GST NO 12681 3153 RT0001

Publications Mail Agreement No 40029359

reg

Member BPA International

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8132019 HRW_20090701_Jul_2009

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OUR WORLD LEADING TECHNOLOGY

WILL HELP YOU CONVERT EVERY DROP

INTO EFFICIENT HYDROPOWER

In a crowded market to stay competitive your hydropower plant needs to run at peak performancewhenever you need it Alstom is the expert in building new and refurbishing old hydropower plants

Using our advanced technology wersquoll breathe new life into your plant - delivering you a higheroutput of clean renewable and flexible energy with better reliability and efficiency Or as we say

hydro efficiency

To learn more visit wwwpoweralstomcomhydro

Visit us at Waterpower XVI Booth 900httphrwhotimscomRS 2

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______________________

_______________

8132019 HRW_20090701_Jul_2009

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4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 744

We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

GGB North America bull 700 Mid Atlantic Parkway Thorofare NJ 08086 Tel +1-856-848-3200 bull Fax +1-856-848-5115 bull hydroGGBearingscom

GGB Austria GmbH bull Gerhardusgasse 25 bull A-1200 Wien bull Tel +43-(0)1-332 49 92 bull Fax +43-(0)1-332 91 60 bull hydroGGBearingscom

copy2009 GGB All rights reserved

Visit us at Waterpower XVI Booth 700httphrwhotimscom RS 3

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 844

6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

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httphrwhotimscom RS 4

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______________

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

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8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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8132019 HRW_20090701_Jul_2009

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Long wear life low friction high abrasion resistance

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

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i t us a

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u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 2: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 901

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_______________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 344

wwwhydroworldcom July 2009 HRW 1

JULY 2009

WIND-HYDRO INTEGRATION

ARTICLES

24 Hydropower in EuropeCurrent Status Future Opportunities By Marla J Barnes

For hydro the European Unionrsquos current push to increase use of renewables translates to

signi1047297cant growth in the development of new capacity and in upgrading of existing facilities

26 Project Development in the HimalayasSolving Geotechnical Challenges

By Imran Sayeed

During hydro project construction in the Himalayas Indian

utility NHPC Limited has faced multiple geotechnical challenges

To overcome these the company has implemented a number

of solutions including providing adequate reinforcement for

rock slopes and choosing tunneling practices to best deal with

the rock conditions

DEPARTMENTS

ADVISORY BOARD

H Irfan AkerDolsar Engineering

Limited Turkey

Ian M CookICCL United

Kingdom

Chris HeadChris Head amp Associates

United Kingdom

Leonard B KassanaEast African Tea

Trade AssociationKenya

Peter Thomas MulvihillPioneer Generation Ltd

New Zealand

Raghunath Gopal(RG) Vartak

AFCONS InfrastructureLimited India

EmmanuelAntwi-Darkwa

Volta River AuthorityGhana

Arturo GilGarcia

IberdrolaGeneration

Spain

Liu HengInternational Network on

Small Hydropower(IN-SHP) PeoplesRepublic of China

Carlos Alberto KnakiewiczItaipu Binacional

Brazil

Montri Suwanmontri PhDDr Montris amp Associates

Thailand

Luis C VintimillaConsulting Engineer

Ecuador

Zhang BotingChinese Society for

Hydropower EngineeringPeoples Republic of

China

Roger GillHydro Focus

Pty LtdAustralia

Zhang JinshengChina Yangtze

Three Gorges ProjectPeoples Republic of

China

Dr Terry MossEskom Generation

South Africa

CVJ VarmaCouncil of Power Utilitiesand The Dams Society

India

James Yang PhDVattenfall Research

and Development ABSweden

2 Viewpoint Hydro and Wind Power

4 Briefings

34 New Hydro

35 Small Hydro

40 Index to Advertisers

12 Pumped Storage Supports Wind Energy

By Fernando Peraacuten Montero and Juan J Peacuterez

Spanish utility Iberdrola isbuilding the 852-MW La Muela 2pumped-storage plant to help 1047297rmthe variability of its more than4200 MW of wind capacity

26

12

Peer Reviewed

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 444

In the world of renewable energy news from 2008 includes the fact of wind pow-

errsquos continued rapid growth Wind added 29 GW during the year Hydropower

also added capacity in this same range mdash 25 to 30 GW

In four years worldwide wind capacity has grown by a factor of 25 times

from 48 GW in 2004 to 121 GW in 2008 mdash an annual growth rate of 26 This

is higher than the growth rate of any other electricity source Three countries mdash

Germany Spain and the United States mdash now host more than half of the worldrsquos

wind capacity And China and India in 4th and 5th place are both adding wind

power at a terri1047297c pace

Hydropower facility owners operators and developers need not worry about

hydro being displaced by wind power or by other new renewable energies or any

other power source The world needs all the electricity it can get mdash especially

renewable energy And where hydro projects are feasible they deliver solid value

Hydro often is a low-cost source of electr icity that provides long-term support for

regional economies Moreover the long life reliability and durability of hydro

projects often provide a bonus Many types of power projects including wind

projects will not endure beyond a 20- or 30-year life Yet after 30 years the

typical hydro project has hardly reached the middle of its li fe

Because the worldwide installation rates of wind and hydro are about the same

gigawatt per gigawatt it could seem fortuitous that new hydro could ldquobalancerdquo

the intermittency of new wind installations Indeed among the top 1047297ve wind-

power countries Spain China and India are rapidly adding hydro and these ad-

ditions aid them in successfully integrating wind power into their electricity grids

Other countries are not so lucky Ireland for example is adding wind power and

is experiencing integration challenges Within Ireland and many other countries

the opportunities for using hydro to support integration are limited

We cannot get too much hydro and wind power To put energy needs in per-

spective what if all of the new demands for electricity in the past ten years had

been provided from hydro and wind (or other renewables) (And please keep

in mind that electricity provides but a fraction of total energy supplies) Over

the decade the 40 addition to total electricity generation added about 6000

terawatt-hours of energy per year To supply this much electricity from hydro

and wind power additions would have required total annual capacity additions

totaling 150 to 200 GW hellip or about three times as much as was installed in 2008

a banner year While these levels of addition may not be beyond possibility they

are de1047297nitely a far stretch from where we are today Itrsquos hard to imagine getting

enough of either hydro or wind

Editor Emeritus

2 HRW July 2009 wwwhydroworldcom

V i e w p o i n t

Hydro and Wind Power

Vol 17 No 3 July 2009

1421 South Sheridan RoadTulsa OK 74112PO Box 1260 Tulsa OK 74101

Telephone (918) 835-3161Fax (918) 831-9834

E-mail hydroreviewpennwellcomWorld Wide Web httpwwwhydroworldcom

PUBLISHER AND CHIEF EDITOR mdash Marla Barnes(816) 931-1311 ext106 marlabpennwellcom

SENIOR ASSOCIATE EDITOR mdash John Braden(816) 931-1311 ext123 johnbpennwellcom

ASSOCIATE EDITOR mdash Elizabeth Ingram(816) 931-1311 ext125 elizabethip ennwellcom

PRESENTATION EDITOR mdash Kermit Mulkins(918) 831-9554 kermitmpennwellcom

CONTRIBUTING EDITOR mdash James L Gordon BSc

CONSULTANTS ADVISORS mdash Leslie Eden and Carl Vansant

SUBSCRIBER SERVICE

PO Box 3264 Northbrook IL 60065-3264Customer Service 847-559-7330

Fax 847-291-4816Email hrwomedacom

MARKETING MANAGER mdash Ashley Wood(918) 832-9326 ashleywpennwellcom

GROUP PUBLISHER NORTH AMERICAN RENEWABLE ENERGY GROUP

Dick Rauner mdash (918) 832-9249 dickrpennwellcom

SR VP POWER GENERATION mdash Richard G Baker(918) 831-9187 richardbpennwellcom

SALES DIRECTOR mdash Howard Lutzk

(816) 931-1311 ext109 howardlpennwellcom

CORPORATE HEADQUARTERS mdash PennWell Corp1421 S Sherid an Road Tulsa OK 74112

Telephone (918) 835-3161

CHAIRMAN mdash Frank T LauingerPRESIDENT CEO mdash Robert F Biolchini

CHIEF FINANCIAL OFFICER SENIOR VICE PRESIDENT mdash Mark C Wilmoth

AUDIENCE DEVELOPMENT MANAGER mdash Emily Martha MartinSR VP AUDIENCE DEVELOPMENT amp BOOK PUBLISHING mdash Gloria Adams

PRODUCTION DIRECTOR mdash Charlie ColePRODUCTION MANAGER mdash Dorothy Davis

HRW (ISSN 1072-9542) is published six times in March May July Sep-

tember October and December by PennWell Corp 1421 S Sheridan Rd

Tulsa OK 74112 phone (918) 835-3161 Printed in USA Canad ian GST

Registration Number 12681 3153 RT0001 Canada Post International

Publications Mail Product (Canadian Distribution) Publications Agree-

ment No 40029359 Copyright 2009 by PennWell Corp (Registered i n

US Patent Trademark Of1047297ce) No part of this periodical may be repro-duced without the consent of the publisher Authorization to photocopy

items for internal or personal use or the i nternal or personal use of speci1047297c

clients is granted by HRW ISSN 1072-9542 provided that the appro-

priate fee is paid directly to Copyright Clearance Center 222 Rosewood

Drive Danvers MA 01923 USA 508-750-8400 Prior to photocopying

items for educational classroom use please contact Copyright Clearance

Center 222 Rosewood Drive Danvers MA 01923 USA 508-750-8400

Periodicals postage paid at Tulsa OK and additional mailing of1047297ces An-

nual subscription rate US$44 per year Single copies US$20 Payments

accepted in US funds only HRW is a subscriber to Reuters and Business

News Americas news services and incorporates their copy in its news col-

umns POSTMASTER Send change of address other circulation infor-

mation to HYDRO REVIEW PO Box 3264 Northbrook IL 600 65-3264

ldquoHRW rdquo is a registered trademark of PennWell Corp Return undeliver-

able Canadian addresses to PO Box 122 Niagara Falls ON L2E 6S4

PRINTED IN THE USA GST NO 12681 3153 RT0001

Publications Mail Agreement No 40029359

reg

Member BPA International

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 544

OUR WORLD LEADING TECHNOLOGY

WILL HELP YOU CONVERT EVERY DROP

INTO EFFICIENT HYDROPOWER

In a crowded market to stay competitive your hydropower plant needs to run at peak performancewhenever you need it Alstom is the expert in building new and refurbishing old hydropower plants

Using our advanced technology wersquoll breathe new life into your plant - delivering you a higheroutput of clean renewable and flexible energy with better reliability and efficiency Or as we say

hydro efficiency

To learn more visit wwwpoweralstomcomhydro

Visit us at Waterpower XVI Booth 900httphrwhotimscomRS 2

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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______________________

_______________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 644

4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 744

We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

GGB North America bull 700 Mid Atlantic Parkway Thorofare NJ 08086 Tel +1-856-848-3200 bull Fax +1-856-848-5115 bull hydroGGBearingscom

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 844

6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___________

___

8132019 HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

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their impact on our environment

with products and processes

that eliminate pollution

Thordon Bearings will reduce your environmentalimpact while improving overall performance by

providing non-polluting oil and grease-free

bearing solutions for rehabilitation and new

turbine projects

Long wear life low friction high abrasion resistance

greaseoil free operation and application engineering

technical support will provide you with bearing solutions that

meet or exceed specifications With worldwide installations

ranging from micro-turbines to units with main shafts up to 24m

(94) Thordon hydro-turbine products will improve performance

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Oil and Grease Free Bearings for all your Hydro Turbine Applications

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

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______________________________

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

Call l 0013304527400 Click l wwwtuffboomcom

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t f l o o d c o n t r o l d a m i n

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

_______________

8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

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Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

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associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

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nation of our global competence

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Page 3: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 344

wwwhydroworldcom July 2009 HRW 1

JULY 2009

WIND-HYDRO INTEGRATION

ARTICLES

24 Hydropower in EuropeCurrent Status Future Opportunities By Marla J Barnes

For hydro the European Unionrsquos current push to increase use of renewables translates to

signi1047297cant growth in the development of new capacity and in upgrading of existing facilities

26 Project Development in the HimalayasSolving Geotechnical Challenges

By Imran Sayeed

During hydro project construction in the Himalayas Indian

utility NHPC Limited has faced multiple geotechnical challenges

To overcome these the company has implemented a number

of solutions including providing adequate reinforcement for

rock slopes and choosing tunneling practices to best deal with

the rock conditions

DEPARTMENTS

ADVISORY BOARD

H Irfan AkerDolsar Engineering

Limited Turkey

Ian M CookICCL United

Kingdom

Chris HeadChris Head amp Associates

United Kingdom

Leonard B KassanaEast African Tea

Trade AssociationKenya

Peter Thomas MulvihillPioneer Generation Ltd

New Zealand

Raghunath Gopal(RG) Vartak

AFCONS InfrastructureLimited India

EmmanuelAntwi-Darkwa

Volta River AuthorityGhana

Arturo GilGarcia

IberdrolaGeneration

Spain

Liu HengInternational Network on

Small Hydropower(IN-SHP) PeoplesRepublic of China

Carlos Alberto KnakiewiczItaipu Binacional

Brazil

Montri Suwanmontri PhDDr Montris amp Associates

Thailand

Luis C VintimillaConsulting Engineer

Ecuador

Zhang BotingChinese Society for

Hydropower EngineeringPeoples Republic of

China

Roger GillHydro Focus

Pty LtdAustralia

Zhang JinshengChina Yangtze

Three Gorges ProjectPeoples Republic of

China

Dr Terry MossEskom Generation

South Africa

CVJ VarmaCouncil of Power Utilitiesand The Dams Society

India

James Yang PhDVattenfall Research

and Development ABSweden

2 Viewpoint Hydro and Wind Power

4 Briefings

34 New Hydro

35 Small Hydro

40 Index to Advertisers

12 Pumped Storage Supports Wind Energy

By Fernando Peraacuten Montero and Juan J Peacuterez

Spanish utility Iberdrola isbuilding the 852-MW La Muela 2pumped-storage plant to help 1047297rmthe variability of its more than4200 MW of wind capacity

26

12

Peer Reviewed

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 444

In the world of renewable energy news from 2008 includes the fact of wind pow-

errsquos continued rapid growth Wind added 29 GW during the year Hydropower

also added capacity in this same range mdash 25 to 30 GW

In four years worldwide wind capacity has grown by a factor of 25 times

from 48 GW in 2004 to 121 GW in 2008 mdash an annual growth rate of 26 This

is higher than the growth rate of any other electricity source Three countries mdash

Germany Spain and the United States mdash now host more than half of the worldrsquos

wind capacity And China and India in 4th and 5th place are both adding wind

power at a terri1047297c pace

Hydropower facility owners operators and developers need not worry about

hydro being displaced by wind power or by other new renewable energies or any

other power source The world needs all the electricity it can get mdash especially

renewable energy And where hydro projects are feasible they deliver solid value

Hydro often is a low-cost source of electr icity that provides long-term support for

regional economies Moreover the long life reliability and durability of hydro

projects often provide a bonus Many types of power projects including wind

projects will not endure beyond a 20- or 30-year life Yet after 30 years the

typical hydro project has hardly reached the middle of its li fe

Because the worldwide installation rates of wind and hydro are about the same

gigawatt per gigawatt it could seem fortuitous that new hydro could ldquobalancerdquo

the intermittency of new wind installations Indeed among the top 1047297ve wind-

power countries Spain China and India are rapidly adding hydro and these ad-

ditions aid them in successfully integrating wind power into their electricity grids

Other countries are not so lucky Ireland for example is adding wind power and

is experiencing integration challenges Within Ireland and many other countries

the opportunities for using hydro to support integration are limited

We cannot get too much hydro and wind power To put energy needs in per-

spective what if all of the new demands for electricity in the past ten years had

been provided from hydro and wind (or other renewables) (And please keep

in mind that electricity provides but a fraction of total energy supplies) Over

the decade the 40 addition to total electricity generation added about 6000

terawatt-hours of energy per year To supply this much electricity from hydro

and wind power additions would have required total annual capacity additions

totaling 150 to 200 GW hellip or about three times as much as was installed in 2008

a banner year While these levels of addition may not be beyond possibility they

are de1047297nitely a far stretch from where we are today Itrsquos hard to imagine getting

enough of either hydro or wind

Editor Emeritus

2 HRW July 2009 wwwhydroworldcom

V i e w p o i n t

Hydro and Wind Power

Vol 17 No 3 July 2009

1421 South Sheridan RoadTulsa OK 74112PO Box 1260 Tulsa OK 74101

Telephone (918) 835-3161Fax (918) 831-9834

E-mail hydroreviewpennwellcomWorld Wide Web httpwwwhydroworldcom

PUBLISHER AND CHIEF EDITOR mdash Marla Barnes(816) 931-1311 ext106 marlabpennwellcom

SENIOR ASSOCIATE EDITOR mdash John Braden(816) 931-1311 ext123 johnbpennwellcom

ASSOCIATE EDITOR mdash Elizabeth Ingram(816) 931-1311 ext125 elizabethip ennwellcom

PRESENTATION EDITOR mdash Kermit Mulkins(918) 831-9554 kermitmpennwellcom

CONTRIBUTING EDITOR mdash James L Gordon BSc

CONSULTANTS ADVISORS mdash Leslie Eden and Carl Vansant

SUBSCRIBER SERVICE

PO Box 3264 Northbrook IL 60065-3264Customer Service 847-559-7330

Fax 847-291-4816Email hrwomedacom

MARKETING MANAGER mdash Ashley Wood(918) 832-9326 ashleywpennwellcom

GROUP PUBLISHER NORTH AMERICAN RENEWABLE ENERGY GROUP

Dick Rauner mdash (918) 832-9249 dickrpennwellcom

SR VP POWER GENERATION mdash Richard G Baker(918) 831-9187 richardbpennwellcom

SALES DIRECTOR mdash Howard Lutzk

(816) 931-1311 ext109 howardlpennwellcom

CORPORATE HEADQUARTERS mdash PennWell Corp1421 S Sherid an Road Tulsa OK 74112

Telephone (918) 835-3161

CHAIRMAN mdash Frank T LauingerPRESIDENT CEO mdash Robert F Biolchini

CHIEF FINANCIAL OFFICER SENIOR VICE PRESIDENT mdash Mark C Wilmoth

AUDIENCE DEVELOPMENT MANAGER mdash Emily Martha MartinSR VP AUDIENCE DEVELOPMENT amp BOOK PUBLISHING mdash Gloria Adams

PRODUCTION DIRECTOR mdash Charlie ColePRODUCTION MANAGER mdash Dorothy Davis

HRW (ISSN 1072-9542) is published six times in March May July Sep-

tember October and December by PennWell Corp 1421 S Sheridan Rd

Tulsa OK 74112 phone (918) 835-3161 Printed in USA Canad ian GST

Registration Number 12681 3153 RT0001 Canada Post International

Publications Mail Product (Canadian Distribution) Publications Agree-

ment No 40029359 Copyright 2009 by PennWell Corp (Registered i n

US Patent Trademark Of1047297ce) No part of this periodical may be repro-duced without the consent of the publisher Authorization to photocopy

items for internal or personal use or the i nternal or personal use of speci1047297c

clients is granted by HRW ISSN 1072-9542 provided that the appro-

priate fee is paid directly to Copyright Clearance Center 222 Rosewood

Drive Danvers MA 01923 USA 508-750-8400 Prior to photocopying

items for educational classroom use please contact Copyright Clearance

Center 222 Rosewood Drive Danvers MA 01923 USA 508-750-8400

Periodicals postage paid at Tulsa OK and additional mailing of1047297ces An-

nual subscription rate US$44 per year Single copies US$20 Payments

accepted in US funds only HRW is a subscriber to Reuters and Business

News Americas news services and incorporates their copy in its news col-

umns POSTMASTER Send change of address other circulation infor-

mation to HYDRO REVIEW PO Box 3264 Northbrook IL 600 65-3264

ldquoHRW rdquo is a registered trademark of PennWell Corp Return undeliver-

able Canadian addresses to PO Box 122 Niagara Falls ON L2E 6S4

PRINTED IN THE USA GST NO 12681 3153 RT0001

Publications Mail Agreement No 40029359

reg

Member BPA International

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OUR WORLD LEADING TECHNOLOGY

WILL HELP YOU CONVERT EVERY DROP

INTO EFFICIENT HYDROPOWER

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hydro efficiency

To learn more visit wwwpoweralstomcomhydro

Visit us at Waterpower XVI Booth 900httphrwhotimscomRS 2

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______________________

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8132019 HRW_20090701_Jul_2009

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4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

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8132019 HRW_20090701_Jul_2009

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We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

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8132019 HRW_20090701_Jul_2009

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6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

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httphrwhotimscom RS 4

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______________

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

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8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___________

___

8132019 HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

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Long wear life low friction high abrasion resistance

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httpslidepdfcomreaderfullhrw20090701jul2009 1444

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1544

W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1644

14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

Call l 0013304527400 Click l wwwtuffboomcom

Worthington waterway barriers L o g j a m a

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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Visit us at Waterpower XVI Booth 119

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________________________________

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

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peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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S 1 4

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

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httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

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bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

_________

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POWER SOLUTIONS

MARELLI MOTORI SpA

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

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Page 4: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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In the world of renewable energy news from 2008 includes the fact of wind pow-

errsquos continued rapid growth Wind added 29 GW during the year Hydropower

also added capacity in this same range mdash 25 to 30 GW

In four years worldwide wind capacity has grown by a factor of 25 times

from 48 GW in 2004 to 121 GW in 2008 mdash an annual growth rate of 26 This

is higher than the growth rate of any other electricity source Three countries mdash

Germany Spain and the United States mdash now host more than half of the worldrsquos

wind capacity And China and India in 4th and 5th place are both adding wind

power at a terri1047297c pace

Hydropower facility owners operators and developers need not worry about

hydro being displaced by wind power or by other new renewable energies or any

other power source The world needs all the electricity it can get mdash especially

renewable energy And where hydro projects are feasible they deliver solid value

Hydro often is a low-cost source of electr icity that provides long-term support for

regional economies Moreover the long life reliability and durability of hydro

projects often provide a bonus Many types of power projects including wind

projects will not endure beyond a 20- or 30-year life Yet after 30 years the

typical hydro project has hardly reached the middle of its li fe

Because the worldwide installation rates of wind and hydro are about the same

gigawatt per gigawatt it could seem fortuitous that new hydro could ldquobalancerdquo

the intermittency of new wind installations Indeed among the top 1047297ve wind-

power countries Spain China and India are rapidly adding hydro and these ad-

ditions aid them in successfully integrating wind power into their electricity grids

Other countries are not so lucky Ireland for example is adding wind power and

is experiencing integration challenges Within Ireland and many other countries

the opportunities for using hydro to support integration are limited

We cannot get too much hydro and wind power To put energy needs in per-

spective what if all of the new demands for electricity in the past ten years had

been provided from hydro and wind (or other renewables) (And please keep

in mind that electricity provides but a fraction of total energy supplies) Over

the decade the 40 addition to total electricity generation added about 6000

terawatt-hours of energy per year To supply this much electricity from hydro

and wind power additions would have required total annual capacity additions

totaling 150 to 200 GW hellip or about three times as much as was installed in 2008

a banner year While these levels of addition may not be beyond possibility they

are de1047297nitely a far stretch from where we are today Itrsquos hard to imagine getting

enough of either hydro or wind

Editor Emeritus

2 HRW July 2009 wwwhydroworldcom

V i e w p o i n t

Hydro and Wind Power

Vol 17 No 3 July 2009

1421 South Sheridan RoadTulsa OK 74112PO Box 1260 Tulsa OK 74101

Telephone (918) 835-3161Fax (918) 831-9834

E-mail hydroreviewpennwellcomWorld Wide Web httpwwwhydroworldcom

PUBLISHER AND CHIEF EDITOR mdash Marla Barnes(816) 931-1311 ext106 marlabpennwellcom

SENIOR ASSOCIATE EDITOR mdash John Braden(816) 931-1311 ext123 johnbpennwellcom

ASSOCIATE EDITOR mdash Elizabeth Ingram(816) 931-1311 ext125 elizabethip ennwellcom

PRESENTATION EDITOR mdash Kermit Mulkins(918) 831-9554 kermitmpennwellcom

CONTRIBUTING EDITOR mdash James L Gordon BSc

CONSULTANTS ADVISORS mdash Leslie Eden and Carl Vansant

SUBSCRIBER SERVICE

PO Box 3264 Northbrook IL 60065-3264Customer Service 847-559-7330

Fax 847-291-4816Email hrwomedacom

MARKETING MANAGER mdash Ashley Wood(918) 832-9326 ashleywpennwellcom

GROUP PUBLISHER NORTH AMERICAN RENEWABLE ENERGY GROUP

Dick Rauner mdash (918) 832-9249 dickrpennwellcom

SR VP POWER GENERATION mdash Richard G Baker(918) 831-9187 richardbpennwellcom

SALES DIRECTOR mdash Howard Lutzk

(816) 931-1311 ext109 howardlpennwellcom

CORPORATE HEADQUARTERS mdash PennWell Corp1421 S Sherid an Road Tulsa OK 74112

Telephone (918) 835-3161

CHAIRMAN mdash Frank T LauingerPRESIDENT CEO mdash Robert F Biolchini

CHIEF FINANCIAL OFFICER SENIOR VICE PRESIDENT mdash Mark C Wilmoth

AUDIENCE DEVELOPMENT MANAGER mdash Emily Martha MartinSR VP AUDIENCE DEVELOPMENT amp BOOK PUBLISHING mdash Gloria Adams

PRODUCTION DIRECTOR mdash Charlie ColePRODUCTION MANAGER mdash Dorothy Davis

HRW (ISSN 1072-9542) is published six times in March May July Sep-

tember October and December by PennWell Corp 1421 S Sheridan Rd

Tulsa OK 74112 phone (918) 835-3161 Printed in USA Canad ian GST

Registration Number 12681 3153 RT0001 Canada Post International

Publications Mail Product (Canadian Distribution) Publications Agree-

ment No 40029359 Copyright 2009 by PennWell Corp (Registered i n

US Patent Trademark Of1047297ce) No part of this periodical may be repro-duced without the consent of the publisher Authorization to photocopy

items for internal or personal use or the i nternal or personal use of speci1047297c

clients is granted by HRW ISSN 1072-9542 provided that the appro-

priate fee is paid directly to Copyright Clearance Center 222 Rosewood

Drive Danvers MA 01923 USA 508-750-8400 Prior to photocopying

items for educational classroom use please contact Copyright Clearance

Center 222 Rosewood Drive Danvers MA 01923 USA 508-750-8400

Periodicals postage paid at Tulsa OK and additional mailing of1047297ces An-

nual subscription rate US$44 per year Single copies US$20 Payments

accepted in US funds only HRW is a subscriber to Reuters and Business

News Americas news services and incorporates their copy in its news col-

umns POSTMASTER Send change of address other circulation infor-

mation to HYDRO REVIEW PO Box 3264 Northbrook IL 600 65-3264

ldquoHRW rdquo is a registered trademark of PennWell Corp Return undeliver-

able Canadian addresses to PO Box 122 Niagara Falls ON L2E 6S4

PRINTED IN THE USA GST NO 12681 3153 RT0001

Publications Mail Agreement No 40029359

reg

Member BPA International

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8132019 HRW_20090701_Jul_2009

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OUR WORLD LEADING TECHNOLOGY

WILL HELP YOU CONVERT EVERY DROP

INTO EFFICIENT HYDROPOWER

In a crowded market to stay competitive your hydropower plant needs to run at peak performancewhenever you need it Alstom is the expert in building new and refurbishing old hydropower plants

Using our advanced technology wersquoll breathe new life into your plant - delivering you a higheroutput of clean renewable and flexible energy with better reliability and efficiency Or as we say

hydro efficiency

To learn more visit wwwpoweralstomcomhydro

Visit us at Waterpower XVI Booth 900httphrwhotimscomRS 2

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______________________

_______________

8132019 HRW_20090701_Jul_2009

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4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 744

We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

GGB North America bull 700 Mid Atlantic Parkway Thorofare NJ 08086 Tel +1-856-848-3200 bull Fax +1-856-848-5115 bull hydroGGBearingscom

GGB Austria GmbH bull Gerhardusgasse 25 bull A-1200 Wien bull Tel +43-(0)1-332 49 92 bull Fax +43-(0)1-332 91 60 bull hydroGGBearingscom

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 844

6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 944

httphrwhotimscom RS 4

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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______________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1044

8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1144

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___

8132019 HRW_20090701_Jul_2009

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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8132019 HRW_20090701_Jul_2009

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

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______________________________

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1944

httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2144

wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2244

Our HyService is electrifying

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2344

w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

_______________

8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2544

wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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___________

____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

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i t us a

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u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 5: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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OUR WORLD LEADING TECHNOLOGY

WILL HELP YOU CONVERT EVERY DROP

INTO EFFICIENT HYDROPOWER

In a crowded market to stay competitive your hydropower plant needs to run at peak performancewhenever you need it Alstom is the expert in building new and refurbishing old hydropower plants

Using our advanced technology wersquoll breathe new life into your plant - delivering you a higheroutput of clean renewable and flexible energy with better reliability and efficiency Or as we say

hydro efficiency

To learn more visit wwwpoweralstomcomhydro

Visit us at Waterpower XVI Booth 900httphrwhotimscomRS 2

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______________________

_______________

8132019 HRW_20090701_Jul_2009

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4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 744

We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

GGB North America bull 700 Mid Atlantic Parkway Thorofare NJ 08086 Tel +1-856-848-3200 bull Fax +1-856-848-5115 bull hydroGGBearingscom

GGB Austria GmbH bull Gerhardusgasse 25 bull A-1200 Wien bull Tel +43-(0)1-332 49 92 bull Fax +43-(0)1-332 91 60 bull hydroGGBearingscom

copy2009 GGB All rights reserved

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 844

6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 4

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______________

8132019 HRW_20090701_Jul_2009

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1144

8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___

8132019 HRW_20090701_Jul_2009

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Long wear life low friction high abrasion resistance

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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8132019 HRW_20090701_Jul_2009

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 6: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 644

4 HRW July 2009 wwwhydroworldcom

PennWell names Barnes publisher of Hydro GroupPennWell Corporation has named Marla Barnes publisher of its Hy-

dropower magazines and events including Hydro Review and HRW

magazines the HydroVision and Waterpower conferences and exhibi-

tions and the electronic news service HydroWorldcom

At the same time Dick Rauner was named publisher of PennWellrsquos

North American Renewable Energy Group of which the Hydro-

power businesses are a part along with the Renewable Energy World

North America Conference and Exhibition and the newly announced

Renewable Energy World North America magazine

Barnes previously was chief editor of the hydropower publications which PennWell

acquired in December 2008 from Kansas City Mo-based HCI Publications Inc She

has 20 yearsrsquo experience as an editor and conference organizer in the hydroelectric power

industry She is relocating from Kansas City to PennWellrsquos headquarters in Tulsa Okla

Rauner built Renewable Energy World North America conference

Rauner previously was exhibit and sponsorship sales manager for PennWellrsquos Renew-

able Energy World North America conference and exhibition He grew the show from

its inception six years ago to its current position as the leading all-renewables confer-

ence and exhibition in North America

Barnes will report to Rauner who will continue to report to Richard G Baker senior

vice president North America Power Group

ldquoWith Dick Rauner as group publisher and Marla Barnes as publisher PennWell

further strengthens its industry-leading North American Power Group to effectively

direct our rapidly growing renewable energy businessesrdquo PennWell President and CEO

Robert F Biolchini said

Variable-speed pumped storage for SwissA partnership of a Swiss utility and a federal railway awarded a 125 million euro

(US$167 million) contract to Alstom to supply the 628-MW Nant de Drance hydro-electric project its 1047297rst variable-speed pumped-storage power plant

Swiss energy provider Alpiq Forces Motrices Valaisannes and Swiss federal railway

SBB are building the 990 million franc (US$950 million) pumped-storage project at

Finhaut in the Swiss Alps

Alstom said it is to supply four 157-MW vertical Francis reversible turbines four

170-megavolt-ampere vertical asynchronous motor-generators and other key equip-

ment to the new plant Alstom said the new installation integrates two state-of-the-art

technologies a conventional pump-turbine and a variable-speed pump-turbine

The conventional unit pumps water into an upper reservoir during low energy

reg

BrieflyCommunaute Electrique du

Benin (CEB) commissioned

Chinese hydropower construc-

tion company SinoHydro to

build the 147-MW Adjarala

hydroelectric project between

Togo and Benin on Africarsquos

Mono River Work on the 282

million euro (US$389 million)

project is to be completed in 45

months

Bolivia President Evo Mo-rales signed a contract with

Italian-led consortium Consor-

cio Hidroelectrico Misicuni for

construction of the 120-meter-

tall Misicuni Dam multipur-

pose project The consortium

is led with 51 percent owner-

ship by Grandi Lavori Fincosit

SpA of Italy Boliviarsquos Em-

presa Nacional de Electricidad

and South Korearsquos Korea Elec-

tric Power Corp have agreed to

build a 120-MW hydro plant at

Misicuni

Empresa de Generacion

Electrica Machupicchu SA(Egemsa) awarded a contract

to Grana y Montero of Peru

to rehabilitate and expand the

107-MW Machu Picchu hydro-

electric project in Perursquos Cusco

Region to 206 MW Grana y

Montero the sole bidder of-

fered a bid of US$148 million

Rehabilitation of Machu Picchu

is required due to 1047298ood damage

in February 1998

Turkish construction com-

pany Dogus Insaat awarded a

contract to Continental Manu-

facturing Co (MA RCO) of the

United States to supply engi-neered conveyor systems for the

528-MW Boyabat hydroelectric

project on the Kizilirmak River

in Turkeyrsquos Sinop Province

MARCO said it is to supply

conveyor systems to transport

and place concrete during con-

struction of Boyabatrsquos 95-me-

ter-tall concrete gravity dam

Boyabat Elektrik Uretim ve

Tic Ltd Sti was granted per-

mission in 2007 to operate the

project for 49 years

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 744

We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

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copy2009 GGB All rights reserved

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8132019 HRW_20090701_Jul_2009

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6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 944

httphrwhotimscom RS 4

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______________

8132019 HRW_20090701_Jul_2009

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1144

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___

8132019 HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

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Long wear life low friction high abrasion resistance

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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8132019 HRW_20090701_Jul_2009

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

Call l 0013304527400 Click l wwwtuffboomcom

Worthington waterway barriers L o g j a m a

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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8132019 HRW_20090701_Jul_2009

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

MARELLI MOTORI SpA

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(T) +39 0444 479 711 - (F) +39 0444 479 888

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

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Page 7: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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We designed our

maintenance-free bearings

with more than just

your plant in mind

GGB Bearings 100 years of bearing experience and superior performance for the hydropower industry

At GGB (formerly Glacier Garlock Bearings) we know how important it is to preserve the environment as well as your

profits With GGB bearings yoursquoll be able to help the environment while also saving on maintenance and man-hours

Self-lubricating GGB HPM trade HPF trade and DB trade bearings were specifically developed to meet hydropower applications

for high load capacity low wear low friction and a long service life So when choosing a bearings

supplier choose one with a history of superior performance Choose GGB

To learn more about GGB hydropower bearings visit wwwGGBearingscomhydro

or e-mail us at hydroGGBearingscom

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6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

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httpslidepdfcomreaderfullhrw20090701jul2009 944

httphrwhotimscom RS 4

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______________

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

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They call Worthington

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security barriers as well as a range of customized

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Our worldwide installation base includes Canada

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Suriname Mozambique Italy Sweden Panama

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You can count on Worthington to provide quality

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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entire facility you get the best

service through HyService

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S 1 4

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____

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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httphrwhotimscom RS 17

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

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associated plant up to and around 20MW

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bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

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bull Plant Assessment bull General Over-

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 8: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 844

6 HRW July 2009 wwwhydroworldcom

demand and releases it to produce energy during peak times The variable-speed unit

regulates the level of the energy it consumes contributing to better grid regulation

The manufacturer said conventional pump-turbines only can operate on a 1047297xed quan-

tity of energy while variable-speed units can regulate the level of energy they comsume

As a result the variable unit continues to function even at lower energy levels assuring asteady re1047297lling of the reservoir while contributing to stabilization of the network

World Bank outlines sustainable hydro prioritiesAcknowledging a sharp change in direction from the 1990s the World Bank is em-

phasizing a growing role for sustainable hydropower to bring both energy and water

resources bene1047297ts to the developing world

In ldquoDirections in Hydropowerrdquo a newly issued exposition of the World Bank

Grouprsquos views on the value of hydropower the bank said hydropower now is viewed

as an integral factor in addressing energy security climate change water security

and regional cooperation

World Bank lending for hydropower bottomed out in 1999 due to growing opposition

from environmental and other non-governmental organizations

ldquoThere are risks inherent in development and operation of hydropower many of

which were the focus of passionate debate in the 1990srdquo the bank said

Three bottom lines social environmental economic

As a consequence the bank said the de1047297nition of acceptable hydropower has shifted

to one that recognizes core principles of sustainable development with attention to so-

cial and environmental as well as economic ldquobottom linesrdquo It said the shift has been

supported by a decade of better understanding and of developing best practices safe-

guards and self-assessment measures from players including the World Bank Equator

Banks International Hydropower Association International Energy Agency the World

Commission on Dams and the United Nations Environment Program

New lending for hydropower increased signi1047297cantly from less than US$250 million

per year from 2002-2004 to US$500 million per year from 2005-2007 In 1047297scal year

2008 new lending for hydro exceeded US$1 billion The bank said 67 hydropower

projects have been approved since 1047297scal year 2003 amounting to US$37 billion in

World Bank Group contributions to support a total of US$85 billion and nearly 9700

MW in project investments

MagEnergy finishing unit rehab at DR Congorsquos 1424-MW Inga 2Canadian magnesium producer MagIndustries Corp reports its MagEnergy Inc sub-

sidiary has nearly completed refurbishment of a 168-MW generating unit of the 1424-

MW Inga 2 hydroelectric project in the Democratic Republic of Congo (DRC)

MagEnergy has been performing Phase 1 rehab of the project on the Congo River

including emergency repairs to several turbines and refurbishment of the previously

non-functioning 168-MW turbine In a statement of year-end results MagIndustries

said MagEnergy has completed about 90 percent of the work necessary to refurbish

turbine G23 the 1047297rst contract at Inga 2

ldquoMagEnergy is close to completing its initial Phase 1 refurbishment project and the

Firm tapped forEcuadorrsquos 1500-MW Coca CodoSinclairDeveloper Coca Codo SinclairSA signed a letter of intent with

Chinese consortium SinoHydro-

Andes JV to complete negotia-

tions for a contract to build the

1500-MW Coca Codo Sinclair

hydroelectric project on Ecua-

dorrsquos Coca River

SinoHydro-Andes and anoth-

er Chinese group had submitted

bids in March to 1047297nance 85 per-

cent of the project and to build it

in Napo Province Upon comple-

tion expected in 2014 the US$2

billion 10-unit project is to use

water from the Coca River near

the Colombia borderCoca Codo Sinclair SA

is a joint venture of Compania

de Generacion Termoelectrica

Pichincha SA (Termopichin-

cha) of Ecuador and Energia

Argentina SA (Enarsa) of

Argentina

Business News Americas

said the letter of intent envi-

sions achieving technical eco-

nomic and legal pre-contract

agreements as well as seeking

project 1047297nancing by Chinarsquos

Export-Import Bank

Andritz to add385-MW unit to105-MW IffezheimProject operator Rheinkraftwerk

Iffezheim GmbH awarded a con-

tract to Andritz Hydro to supply

electro-mechanical equipment

for a new Unit 5 expanding the

105-MW Iffezheim hydroelec-

tric project on the Rhine River

German utility EnBW

which jointly owns Rheink-

raftwerk Iffezheim with Elec-

tricite de France had issued sev-

eral solicitations seeking various

equipment to expand IffezheimAndrit z said April 29 the 25

million euro (US$333 million)

order calls for a new 385-MW

bulb-type turbine-generator

with a 68-meter-diameter run-

ner When work is complete in

2011 the unit would increase

Iffezheim to 1435 MW mak-

ing it the largest hydropower

plant on the Rhine

The new unit is to increase

total project annual generation

to 860 million kilowatt-hours

from 740 million kWh

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 944

httphrwhotimscom RS 4

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______________

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1144

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

___

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1344

MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

Environmentally Engineered BearingsEliminating Grease and Oil from Your Turbine

Globally individuals and

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their impact on our environment

with products and processes

that eliminate pollution

Thordon Bearings will reduce your environmentalimpact while improving overall performance by

providing non-polluting oil and grease-free

bearing solutions for rehabilitation and new

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Long wear life low friction high abrasion resistance

greaseoil free operation and application engineering

technical support will provide you with bearing solutions that

meet or exceed specifications With worldwide installations

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(94) Thordon hydro-turbine products will improve performance

reduce downtime and save you money

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Tel 19053351440 bull Fax 19053354033

wwwThordonBearingscom

Oil and Grease Free Bearings for all your Hydro Turbine Applications

Visit us at Waterpower XVI Booth 2003httphrwhotimscom RS 6

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1444

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1544

W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

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signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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Worthington waterway barriers L o g j a m a

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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________________________________

___________________

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

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peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

httphrwhotimscom RS 26

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

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Hydro Power

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Page 9: HRW_20090701_Jul_2009

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8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___________

___

8132019 HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

Environmentally Engineered BearingsEliminating Grease and Oil from Your Turbine

Globally individuals and

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with products and processes

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Thordon Bearings will reduce your environmentalimpact while improving overall performance by

providing non-polluting oil and grease-free

bearing solutions for rehabilitation and new

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Long wear life low friction high abrasion resistance

greaseoil free operation and application engineering

technical support will provide you with bearing solutions that

meet or exceed specifications With worldwide installations

ranging from micro-turbines to units with main shafts up to 24m

(94) Thordon hydro-turbine products will improve performance

reduce downtime and save you money

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wwwThordonBearingscom

Oil and Grease Free Bearings for all your Hydro Turbine Applications

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8132019 HRW_20090701_Jul_2009

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1744

httphrwhotimscom RS 8 Visit us at Waterpower XVI Booth 1014

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______________________________

8132019 HRW_20090701_Jul_2009

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

Call l 0013304527400 Click l wwwtuffboomcom

Worthington waterway barriers L o g j a m a

t f l o o d c o n t r o l d a m i n

P e n n s y l v a n i a ( U S A

)

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 10

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Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

_______________

8132019 HRW_20090701_Jul_2009

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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__________

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________

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_______

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

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________

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

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2 7 -3 0 2 0

0 9Booth 1001

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Page 10: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1044

8 HRW July 2009 wwwhydroworldcom

sale of the energy generated from that project will make a solid contribution to the com-

panyrsquos resultsrdquo MagIndustries said ldquoRevenues from the sale of 84 MW representing 50

percent of the fully restored 168-MW capacity will potentially be generated by late 2009rdquo

In February 2008 DRC Prime Minister Antoine Gizenga endorsed a proposal by

MagEnergy to perform Phase 2 rehabilitation of Inga 2 The estimated US$110 millionPhase 2 program would rehabilitate an additional four turbines at eight-unit Inga 2 to

restore them to operation over 1047297ve years

Costa Rica approves hydro project concession lawPresident Oscar Arias signed a new law ensuring the participation of private companies

in the development of hydropower projects in Costa Rica

Arias signed the framework law on concessions for the utilization of hydropower dur-

ing an April meeting of Costa Ricarsquos governing council The measure previously was

approved by Costa Ricarsquos assembly

The presidentrsquos of1047297ce said the law ensures the participation of private enterprise in hy-

dropower generation and provides the Ministry of Environment Energy and Telecom-

munications the power to grant concessions up to 25 years The agency also may extend

concessions for another 25 years if developers comply with ministry requirements

The new law 1047297lls a loophole created by legislation in the 1990s that transformed Costa

Ricarsquos previous concession authority the National Electricity Authority into utility reg-

ulator Autoridad Reguladora de los Servicios Publicos (Aresep) At that time the legisla-

tion failed to establish a new agency to continue to award hydropower concessions

Yangtze Power takes on more of 22400-MW Three GorgesChinarsquos Yangtze Power Co operator of 22400-MW Three Gorges Dam is carrying

out a 1075 billion renminbi (US$1576 billion) restructuring plan that includes acquir-

ing full ownership of the projectrsquos 26 operating units totaling 18200 MW

Yangtze Power said it would issue 155 billion shares to its parent China Three

Gorges Project Corp in a private placement for 1289 renminbi (US$188) each rais-

ing 20 billion renminbi (US$29 billion) and pay 375 billion renminbi (US$55 bil-

lion) in cash to acquire assets from China Three Gorges It also is to take on 50 billion

renminbi (US$73 billion) in debt

The assets being acquired include the remaining 18 generating units of the original

26-unit Three Gorges project that Yangtze Power does not already own The acquisi-

tion is to more than double Yangtze Powerrsquos installed capacity and is to increase its

2009 net pro1047297t to 63 billion renminbi (US$922 million) from last yearrsquos 393 billionrenminbi (US$575 mil lion)

The plan for Three Gorges originally called for 26 generators 14 on the left bank of the

Yangtze River and 12 on the right for a total of 18200 MW The project has since been ex-

panded further with another six turbines being added by 2012 for a total of 22400 MW

Asian bank rates Mekong energy aidThe Asian Development Bank (ADB) rates as ldquosuccessfulrdquo its aid program to the en-

ergy sector in the Greater Mekong Subregion (GMS) of Southeast Asia including as-

sistance to major hydroelectric projects in the region

China bank tofinance 1500-MWMphanda NkuwaThe Export-Import Bank of Chi-

na agreed to 1047297nance construc-tion of the 1500-MW Mphanda

Nkuwa hydroelectrict project on

Mozambiquersquos Zambezi River

Mozambiquersquos O Pais news-

paper quoted Energy Minister

Salvador Namburete saying

construction of the US$2 bil-

lion dam is to begin in 2010

in the northern Tete Prov-

ince The China Exim bankrsquos

US$23 billion loan package

also includes funding a trans-

mission line from the dam site

to Maputo the capital

A detailed proposal for con-

struction of Mphanda Nkuwaboosted the capacity of the pro-

posed project to 1500 MW from

1300 MW in 2007 Additional-

ly the project is seen potentially

expanding to 2400 MW

ldquoWe expect the process to

be 1047297nalized by December this

year and construction should

begin between April and May

next yearrdquo Namburete said

The project is being devel-

oped by Brazil construction

1047297rm Camargo Correa national

utilit y Electricidade de Mocam-

bique and Energia Capital

Alstom torevamp more unitsof 10300-MWSimon BolivarVenezuela utility CVG Elec-

tri1047297cacion del Caroni (Edelca)

has awarded a 31 million euro

(US$414 million) contract to

Alstom Hydro for refurbish-

ment of 1047297ve generators of the

10300-MW Simon Bolivar

hydroelectric project on Ven-

ezuelarsquos Caroni River

The contract is the fourth

awarded to Alstom by Edelca

and is part of a complete mod-

ernization program to extend

the projectrsquos life by 30 years

In 2007 Alstom received an 80

million euro (US$107 million)

contract for refurbishment of

four turbine-generators

In the latest contract Al-

stom is to refurbish 1047297ve 630-

MW generators in powerhouse

2 including rehabilitation of

stators and rotors and the sup-

ply of auxiliaries

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1144

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___

8132019 HRW_20090701_Jul_2009

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

Visit us at Waterpower XVI Booth 119

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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8132019 HRW_20090701_Jul_2009

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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____

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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Since 1931

- Superior quality withbull Highest wear resistance

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- Extended operating life

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

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associated plant up to and around 20MW

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bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

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Your Partner for

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POWER SOLUTIONS

MARELLI MOTORI SpA

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(T) +39 0444 479 711 - (F) +39 0444 479 888

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

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Page 11: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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___________

___

8132019 HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

Environmentally Engineered BearingsEliminating Grease and Oil from Your Turbine

Globally individuals and

companies are striving to reduce

their impact on our environment

with products and processes

that eliminate pollution

Thordon Bearings will reduce your environmentalimpact while improving overall performance by

providing non-polluting oil and grease-free

bearing solutions for rehabilitation and new

turbine projects

Long wear life low friction high abrasion resistance

greaseoil free operation and application engineering

technical support will provide you with bearing solutions that

meet or exceed specifications With worldwide installations

ranging from micro-turbines to units with main shafts up to 24m

(94) Thordon hydro-turbine products will improve performance

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Oil and Grease Free Bearings for all your Hydro Turbine Applications

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1644

14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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________________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1744

httphrwhotimscom RS 8 Visit us at Waterpower XVI Booth 1014

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______________________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1844

16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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t f l o o d c o n t r o l d a m i n

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1944

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Visit us at Waterpower XVI Booth 1008

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2044

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2144

wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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________________

________

___________

8132019 HRW_20090701_Jul_2009

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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___________

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

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Service amp Rehab ndash Your partner nearby

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Page 12: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1244

10 HRW July 2009 wwwhydroworldcom

ADB issued an assessment of its aid to the energy sector program of the GMS

which includes Cambodia Laos Vietnam Thailand Myanmar and provinces in

southeastern China

ldquoThe evaluation found that ADBrsquos GMS energy program has resulted in signi1047297cant

economic bene1047297ts to the participating countriesrdquo ADB said ldquoAn important apparentbene1047297t of the GMS energy program has been the demonstration effect There is clear

evidence that investor con1047297dence in undertaking power export projects in the region

has risen strongly in recent yearsrdquo

The bank said total energy investment costs under the GMS program are US$17 bil-

lion 17 percent of the total GMS project costs of US$103 billion It said to date ADB has

provided US$1854 million additional and concessionary assistance for the GMS energy

sector of which 95 percent is loans and the remainder is technical assistance grants

Three of the loans 1047297nanced construction of hydropower projects in Laos aimed at

exporting power to Thailand They include 60-MW Nam Leuk 210-MW Theun-

Hinboun which is being expanded by the 280-MW Theun-Hinboun Expansion proj-

ect and 1070-MW Nam Theun 2

Philippines implements renewable energy incentivesPhilippines Energy Secretary Angelo Reyes signed rules May 25 implementing legislation

to encourage investments in renewable energy including hydropower and ocean energy

The rules implement the Renewable Energy Act enacted in December providing

tax incentives to investors in hydropower and ocean solar geothermal and biomass

energy Incentives include a seven-year income tax holiday duty-free importation of

equipment and a zero percent value-added tax rate for power sales

Although a third of the Philippinesrsquo energy mix is renewable energy including hydro and

geothermal energy the government plans to increase that to 40 percent over 10 years

Reyes told a news brie1047297ng the government hopes to attract up to US$10 billion in

renewable energy investments over the next decade Local news reports quoted him

saying the total renewable potential of the entire country is 200000 MW compared to

existing generating capacity of 15000 MW

On-Line Report

NA = Not available

ProjectName

Owner Country River Capacity(in MW)

On-LineDate

ServiceProduct Suppliers Cost(US$ millions)

Notes

Kopswerk 2 VorarlbergerIllwerke AG Austria Ill 450 May-09

ABB AG Adams Schweig AG Andr itz Hydro Arge Drukstollen Kops II (Swiete lsky BauTunnelbau GesmbH Torno SA and TornoSpA) Arge Kavernenkrafthaus Kops II

(Jager Bau GmbH Beton und MonierbauZublin and Alpine Mayreder) COWA Remsc-heid GmbH Hans Kunz GmbH VAM GmbH

VA Tech SAT GmbH amp Co Voith Hydro

545

Pumped storageusing separate

pumps andturbines

Laxiwa Yellow River Hydro-power Development

CoChina Yellow 4200 May-09 Voith Hydro 2200

First two of six700-MW units

start

Masparro Corporacion Elec-trica Nacional Venezuela Masparro 25 May-09 NA 40 Built at existing

Masparro Dam

NZ studiesfour Clutha Riverhydro optionsNew Zealand utility Contact

Energy invites comments on

four options to develop hy-dropower on the Clutha Riv-

er ranging from 86 MW to

350 MW

Contact invited comments

on a special Internet site linked

to the utility website www

contactenergyconz Options

include 350-MW Tuapeka

Mouth 185-MW Beaumont

160-MW Queensberry and

86-MW Luggate

ldquoNormally developers se-

lect a preferred project upon

which they consult with the

communityrdquo the Contact

website said ldquoWe donrsquot yethave a preferred option -- we

want to hear peoplersquos views

more generally and on each

of the options that we are cur-

rently reviewingrdquo

The utility said it wants

people to tell Contact what

they think about the possi-

bility for new hydro devel-

opment and what ideas they

might have for possible hydro

schemes It proposes to an-

nounce a preferred option in

2010 leading to further dis-

cussion of a more clearly de-

fined proposalThe four hydro schemes un-

der consideration were inherit-

ed by Contact Energy from its

predecessor Electricity Corp

of New Zealand

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

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They call Worthington

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security barriers as well as a range of customized

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Our worldwide installation base includes Canada

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Suriname Mozambique Italy Sweden Panama

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You can count on Worthington to provide quality

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 10

httphrwhotimscom RS 11

Visit us at Waterpower XVI Booth 1008

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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entire facility you get the best

service through HyService

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S 1 4

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____

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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httphrwhotimscom RS 17

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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PAN reg bronzesand

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- Superior quality withbull Highest wear resistance

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

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Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

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Your Partner for

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POWER SOLUTIONS

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Page 13: HRW_20090701_Jul_2009

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MAIN GUIDE BEARINGS bull WICKET GATE BEARINGS bull SEGMENTED SHAFT SEALS

Environmentally Engineered BearingsEliminating Grease and Oil from Your Turbine

Globally individuals and

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their impact on our environment

with products and processes

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Thordon Bearings will reduce your environmentalimpact while improving overall performance by

providing non-polluting oil and grease-free

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Long wear life low friction high abrasion resistance

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Oil and Grease Free Bearings for all your Hydro Turbine Applications

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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8132019 HRW_20090701_Jul_2009

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

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______________________________

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

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)

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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Visit us at Waterpower XVI Booth 1008

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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8132019 HRW_20090701_Jul_2009

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

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____

_______________

8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2544

wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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Visit us at Waterpower XVI Booth 3016

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

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IHA rsquo09 in Reykjavik

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for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

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environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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_________________________

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________

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

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________

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

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Page 14: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1444

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W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1644

14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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________________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1744

httphrwhotimscom RS 8 Visit us at Waterpower XVI Booth 1014

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______________________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1844

16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

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P e n n s y l v a n i a ( U S A

)

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1944

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Visit us at Waterpower XVI Booth 1008

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2044

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2144

wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

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Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

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Page 15: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 1544

W i n d - H y d r o I n t e g r a t i o n

wwwhydroworldcom July 2009 HRW 13

Public awareness continues to increase re-

garding the environmental effects of green-

house gas emissions As a result of this increasing

awareness over the past 15 years there has been

substantial development throughout the world of

new electricity generating technologies that pro-

duce fewer greenhouse gas emissions

Wind power is now included in the electricity

systems of many developed countries In Spain

more than 13800 MW of wind power is installed

providing about 10 percent of the countryrsquos elec-

tricity production

While wind power can offer signi1047297cant 1047297nan-

cial and environmental returns this resource does

pose many challenges Among these is the fact that

wind is an idiosyncrat ic ldquofuelrdquo due to its stochastic

nature and to the fact that it is impossible to store

This idiosyncrasy poses dif1047297culty for managing

energy systems with a signi1047297cant increase in the

resources required to establish a real-time balance

between generation and demand

There are several existing generation technolo-

gies available to 1047297rm the variability of wind capac-

ity At Iberdrola we believe the best operational

option is pumped storage which is always avail-

able and provides signi1047297cant 1047298exibility with regard

to start ups and shutdowns Iberdrola is building

the 852-MW La Muela 2 pumped-storage plant

for this purpose and is investigating construction

of three additional pumped-storage plants with a

total capacity of 1640 MW

Iberdrolarsquos wind resources

Iberdrola is the largest producer of wind energyin the world At the end of 2008 the company

had an installed wind capacity of 9302 MW

around the world including 4526 MW in Spain

665 MW in the United Kingdom and 2876 MW

in the United States These plants produce nearly

17000 gigawatt-hours of electricity each year In

addition Iberdrola is investigating potential new

wind plants around the world with a total capacity

of more than 54000 MW

By comparison worldwide wind capacity at the

end of 2008 was nearly 121200 MW with pro-

duction of 260 terawatt-hours of electricity each

year according to the World Wind Energy As-

sociation More than 27200 MW of this capacity

was added in 2008 the association reports

Challenges with wind in

an electricity system

Wind is limited in quantity and cannot be stored

Therefore it is important to forecast wind speed

in order to estimate future production However

because wind is highly variable this production

forecast has a large margin of error

Wind imposes special requirements on the elec-

tricity system both in the long and short term

Long term

Over the long term the challenge arises from the fact

that there are periods of time during which high de-

mand coincides with a low level of wind power gen-

eration and vice versa For example for wind pro-

duction by the Spanish mainland power system the

average load level between 2005 and 2007 was about

21 percent During this same time period the load

factor mdash the ratio between the net amount of elec-tricity generated and net output capacity mdash varied

Fernando Peraacuten Montero

and Juan Peacuterez are

electrical engineers in the

hydropower generation

division of Iberdrola Mr

Peraacuten is coordinating

the electromechanical

engineering for the 852-MW

La Muela 2 pumped-

storage plant Mr Peacuterez

formerly was a trader in

the energy management

division of Iberdrola

Spanish utility Iberdrola is building the 852-MW La Muela 2 pumped-storage plant to helpfi rm the variability of its more than 4200 MW of wind capacity in the country The utility seespumped storage as the best option for supporting other renewables

By Fernando Peraacuten

Montero and

Juan J Peacuterez

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

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signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

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security barriers as well as a range of customized

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Our worldwide installation base includes Canada

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You can count on Worthington to provide quality

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LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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________________________________

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

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peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

httphrwhotimscom RS 26

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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hydrogilkescomUSA Gilkes Inc

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

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bull from projects to complex systems

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POWER SOLUTIONS

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Hydro Power

We generate added value for you

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Page 16: HRW_20090701_Jul_2009

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14 HRW July 2009 wwwhydroworldcom

The 635-MW La Muela pumped-storage plant inSpain is being expanded with the addition of a sec-ond powerhouse 852-MW La Muela 2 Iberdrola an-ticipates that this plant will begin operating in 2012

to help firm the variability of the utilityrsquos extensivewind capacity

httphrwhotimscom RS 7 Visit us at Waterpower XVI Booth 2013

signi1047297cantly with values of 25 percent to

70 percent Thus wind power stations may

not be available at those times in which they

are most needed for the electricity system

This requires the installation of additionalpower based on other technologies which

replaces wind during periods of low wind

electricity production

generating company produces a weekly

operation schedule that plans the start up

and shutdown time for each plant (called

the ldquounit commitmentrdquo) Thermal sta-

tions have a high cost associated with

start ups and shutdowns so utilities make

use of their most 1047298exible plants such as

conventional hydro plants and pumped-

storage facilities In this context the

presence of substantial wind power pro-

duction has an important effect on the

weekly operation schedule Because of

the stochastic nature of wind speed the

uncertainty involved in weekly planning

is plusmn25 percent of installed capacity with

a con1047297dence level of 70 percent1 With

wind power in Spain of 13836 MW the

uncertainty level on a one-week horizon is

plusmn3460 MW To absorb this uncertainty

would require shutting down or starting

up about nine 400-MW single-shaft

combined-cycle plants

On the daily horizon auctioning of

production and demand of most of the

systemrsquos energy occurs one day ahead

Predictive uncertainty in wind power

production one day in advance is plusmn 15

percent1 Using the 13836 MW of wind

power in Spain as an example this un-certainty represents about 2075 MW

Short term

Over the short term the effect of wind

power production on the balance be-

tween the market and electricity system

is clear The time horizons of interest in-clude weekly daily and real time

Due to the difference in demand

between work days and holidays each

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

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Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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Visit us at Waterpower XVI Booth 1008

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___________________

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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_______________

8132019 HRW_20090701_Jul_2009

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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- Superior quality withbull Highest wear resistance

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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bull from concept to completion and operation

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POWER SOLUTIONS

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Hydro Power

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Service amp Rehab provides solutions

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Page 17: HRW_20090701_Jul_2009

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

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Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

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You can count on Worthington to provide quality

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

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Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

8132019 HRW_20090701_Jul_2009

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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entire facility you get the best

service through HyService

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

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Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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Visit us at Waterpower XVI Booth 3016

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

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Since 1931

- Superior quality withbull Highest wear resistance

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- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

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Your Partner for

Water Resources and

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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with our local presence guarantees

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Page 18: HRW_20090701_Jul_2009

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16 HRW July 2009 wwwhydroworldcom

Who do the Worldrsquos dam ownerscall for waterway barriers

They call Worthington

Worthington is a name you can trust for all of your

waterway barriers needs including debris and trash

barriers heavy duty hyacinth control boat barriers

security barriers as well as a range of customized

solutions tailored to your project

Our worldwide installation base includes Canada

Spain Portugal Ireland Uganda Chile Indonesia

Suriname Mozambique Italy Sweden Panama

USA and more

You can count on Worthington to provide quality

barriers competent engineering and outstanding

customer service

LOG amp DEBRIS BOOMSLOG amp DEBRIS BOOMS

BOAT BARRIERSBOAT BARRIERS

Call l 0013304527400 Click l wwwtuffboomcom

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This is equivalent to start ing up or shut-

ting down 1047297ve 400-MW single-shaft

combined-cycle plants

A substantial portion of the work to

correct this imbalance may be performedin markets organized less than one day

ahead (typically three to 24 hours) How-

ever the remaining imbalance has to be

andor decrease generation which is

governed in real time by the system

operatorrsquos secondary powerfrequency

regulation loop and

mdash A tert iary reserve mechanismwhich consists of the start upshutdown

of a series of plants that receive remu-

neration for varying the load over a

maximum time of 10 minutes

The role hydro can play in these two

mechanisms is discussed below

Why pumped storage

is the best option

There are several types of electricity gen-

eration technologies that can be used to

help 1047297rm the variability of wind capac-

ity These include conventional hydro

pumped storage conventional thermal

gas and combined cycle To analyze the

regulation capacity of these technolo-

gies Iberdrola considered

mdash Start-up and shutdown capacity

mdash Regulation velocity (in percent

load per minute) and

mdash Technical min imum load (in per-

cent of maximum load)

Conventional hydro

Hydro plants have several advantages

First they are the most 1047298exible of the

technologies in performing continuous

start ups and shutdowns without a sig-

ni1047297cant detrimental effect on the equip-

mentrsquos service life Second their load

variation speed is high For example it is

possible to vary the power by about 100

percent per minute Third the minimum

load is low often less than 10 percent of

the installed power Fourth their fuel

cost is zero And last they do not produce

any emissions of greenhouse gases

The only limitation of this type of tech-

nology is its connection to the hydraulic

management of rivers This is mainly

conditioned by the storage capacity of thereservoirs in the basin in which each plant

managed in real time by other groups of

the system which requires an increase in

the services dedicated to this objective

Using the Spanish mainland power sys-

tem as an example there are two principalmechanisms to solve these imbalances

mdash A secondary reserve system in

which plants offer a range to increase

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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S 1 4

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8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

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i t us a

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u l y

2 7 -3 0 2 0

0 9Booth 1001

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Page 19: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 1008

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________________________________

___________________

____ _______

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2144

wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

wwwvoithhydrocom h t t p h r w h o t i m s c o m R

S 1 4

Visit us at Waterpower XVI Booth 1000

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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POWER SOLUTIONS

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Hydro Power

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Page 20: HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

httphrwhotimscom RS 13

Visit us at Waterpower XVI Booth 4012

peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

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of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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entire facility you get the best

service through HyService

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

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associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

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Page 21: HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 19

Wind turbines provided about 10 percent of the elec-tricity production in Spain Spanish utility Iberdrolathe largest producer of wind energy in the worldhad installed wind capacity worldwide of 9302 MWThe utility is building pumped-storage facilities tohelp firm the variability of its wind capacity

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peak electricity demand

After conventional hydro pumped-

storage plants are the best choice to 1047297rm

the variability of wind Power from these

plants is available without the restrictionsinherent in conventional hydro plants

A disadvantage of this technology is its

ldquofuel costrdquo However in systems with a

signi1047297cant quantity of thermal generation

this risk is quite limited because off-peak

prices usually drop considerably due to

the fact that these stations cannot perform

start ups and shutdowns on a daily basis

Conventional thermal

The star t-up and shutdown capacity of a

conventional thermal plant is limited for

two reasons First its start-up process

requires a substantial amount of energy

which involves a substantial cost Sec-

ond performing continuous start ups

this type of plant the main disadvantage

is their high fuel cost (40 percent greater

than those of combined cycle plants)

Combined cycle

From the 1047298exibility point of view these are

and shutdowns signi1047297cantly reduces the

service life of the plant

The regulation velocity of conven-

tional thermal stations is limited to about

1 percent per minute due to their highthermal inertia However their control

range is acceptable given that the tech-

nical minimum lies at about 45 percent

of maximum power

Open cycle gas

This type of technology involves signi1047297-

cant 1047298exibility for continuous start ups and

shutdowns In addition it allows relatively

rapid power variations with a change ve-

locity of about 4 percent per minute

On the other hand the minimum power

of these plants usually is about 60 percent

of full load which limits their regulation

capacity to 40 percent of rated power

Despite the technical advantages of

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______________

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

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of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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entire facility you get the best

service through HyService

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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_______________

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

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_______________

______________________

8132019 HRW_20090701_Jul_2009

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

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Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

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nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

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Our HyService is electrifying

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

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of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

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S 1 4

Visit us at Waterpower XVI Booth 1000

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Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

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STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

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For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

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Since 1931

- Superior quality withbull Highest wear resistance

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- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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_____

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________

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___________

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POWER SOLUTIONS

MARELLI MOTORI SpA

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(T) +39 0444 479 711 - (F) +39 0444 479 888

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

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nation of our global competence

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Page 23: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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w w w m s w d e

Why do more hydro power ownerschoose Voith Hydro as their reliable

partner for services products and

solutions Because of our exper-

tise We are the preferred supplier

of state-of-the-art hydro power

generation equipment solutions

and service HyService

Our service maintenance andoperational skills are unsurpassed

Whether you want us to trouble-

shoot a generator or upgrade an

entire facility you get the best

service through HyService

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S 1 4

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____

_______________

8132019 HRW_20090701_Jul_2009

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22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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8132019 HRW_20090701_Jul_2009

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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Visit us at Waterpower XVI Booth 3016

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

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for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

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environmentsenvironments

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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___________

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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________

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8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

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u l y

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0 9Booth 1001

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Page 24: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2444

22 HRW July 2009 wwwhydroworldcom

httphrwhotimscom RS 15

Visit us at Waterpower XVI Booth 606

Because of its rapid development of new

wind turbine installations Iberdrola is

continuously seeking to broaden its port-

folio of pumped-storage stations It can be

dif1047297cult to 1047297nd suitable sites that permitthe construction of pumped-storage sta-

tions at a moderate investment cost Even

in systems where suitable sites are avail-

able the investment cost of this type of sta-

tion is very high which obliges developers

to assume a very high risk during the long

periods of amortization required

Iberdrolarsquos most recent activity to add

to its pumped-storage portfolio involves

expansion of the existing 635-MW La

Muela plant with the installation of a sec-

ond powerhouse La Muela began operat-

ing in 1989 Construction of 852-MW La

Muela 2 began in 2006 and is expected

to be complete in 2012 The new power-

house will contain four sets of generators

In the case of systems with low levels

of hydro generation a mixture of open

cycle and combined cycle power plants

is the most viable alternative to 1047297rm the

variability of wind

Iberdrolarsquos pumped storage

development activity

Iberdrola has always sought to develop

technologies that provide low greenhouse

emissions In fact the company has about

10000 MW of hydro capacity world-

wide including more than 8800 MW

in Spain Of this 8800 MW more than

2300 MW is pumped storage Ibderdro-

larsquos plants represent 47 percent of the

installed hydro capacity in Spain This

large portfolio of hydropower plants has

allowed Iberdrola to maximize the prof-

itability of its wind turbine installations

from the moment of their construction

between conventional thermal stations and

open cycle turbines Thus with respect to

conventional thermal stations they are

more robust to perform continuous start

ups and shutdowns due to the greater1047298exibility provided by the gas turbine

With regard to the regulation veloc-

ity it is about 25 percent per minute

slightly lower than open cycle turbines

because of the higher thermal inertia of

the combined cyclersquos conventional part

Lastly the minimum power of these

plants is nearly 50 percent of the power

at full load

After conventional hydro and pumped

storage combined cycle plants are the

next most likely option to 1047297rm the vari-

ability of wind These plants can render

regulation services at a moderate variable

cost although qualitatively higher than

conventional hydro or pumped storage

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wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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8132019 HRW_20090701_Jul_2009

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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mwhglobalcom3128313515

MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

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Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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Visit us at Waterpower XVI Booth 808

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_________________________

___________

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________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

_________

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________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 25: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2544

wwwhydroworldcom July 2009 HRW 23

httphrwhotimscom RS 16

(supplied by Alstom) and pump-turbines

(supplied by Voith Hydro) Fomento de

Construcciones y Contratas SA (FCC)

of Spain is the civil contractor for La Mu-

ela 2 and a consortium of Alstom SacyrVallehermoso and Cavosa is supplying

the penstock Ingenieria y Construccion

SAU (Iberinco) is performing the engi-

neering work for La Muela 2

In addition to this plant currently

under construction Iberdrola plans to

develop the Alto Tomega hydroelectric

complex in Portugal Construction of

the 1200-MW complex involves build-

ing four dams and four power stations

two of which will be pumped-storage fa-

cilities The two pumped-storage plants

will be 779-MW Gouvaes and the 112-

MW Pradoselos Construction on this

complex is proposed to begin in 2010

and be completed in 2018

Accordingly Iberdrola is involved in the

development of several of these plants

When completed 2018 they will provide

nearly 1750 MW of capacity to the elec-

trical system in Spain and Portugal

Note

1Nielsen Henrik Aalborg et al et al ldquoFrom

Wind Ensembles to Probabilistic Informa-

tion about Future Wind Power Production

ndash Result s from an Actual Applicationrdquo

9th International Conference on Probabi-

listic Methods Applied to Power Systems

Royal Inst itute of Technology Stockholm

Sweden 2006

Reference

Carlsson Frederik and Viktoria Neimane

ldquoA Massive Introduction of Wind Power

Changed Market Conditionsrdquo Elforsk

Report Elforsk Sweden June 2008

Finally Iberdrola is considering sev-

eral other locations for pumped-storage

facilities Among these is the 750-MW

Santa Cristina plant in Spain

Summary

Wind power is a generating technology

that is included in many countriesrsquo electri-

cal systems and permits a substantial re-

duction in emissions of greenhouse gases

However the increasing penetration of

this technology in current electricity sys-

tems requires a substantial increase in the

resources required to balance generation

and demand as well as additional invest-

ments to guarantee the continuity of elec-

tricity supply when wind intensity is low

Of all of the available technologies in

current electricity systems pumped-stor-

age plants constitute the most attractive

option for 1047297rming the variability of wind

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___________

____________

8132019 HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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httphrwhotimscom RS 17

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2844

26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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Visit us at Waterpower XVI Booth 808

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

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Page 26: HRW_20090701_Jul_2009

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24 HRW July 2009 wwwhydroworldcom

Marla Barnes is Publishe r

Hydro Group for

PennWell Corporation

By 2020 a 1047297fth of all energy consumption in

European Union (EU) member countries

must come from renewable sources mdash hydro

wave solar wind and biomass This mandate

which EU leaders signed in March 2007 is part of

a proposal designed to cut greenhouse gas emis-

sions by 20 percent (compared with 1990 levels)

For hydroelectric power this mandate trans-

lates to signi1047297cant growth in development of new

capacity and in upgrading of existing facilities

throughout Europe

Several new conventional hydroelectric proj-

ects entered commercial operation in the past

few months hellip something not seen in several de-

cades Examples of new projects include Sonna

in Norway (270 MW) Glendoe in the United

Kingdom (100 MW) and Blanca in Slovenia

(425 MW)

For small hydro (less than 10 MW) devel-

opment opportunities are signi1047297cant Provided

the mandate by EU member countries is imple-

mented on a timely basis the European Small

Hydropower Association (ESHA) estimates that

installed small hydro capacity could reach 16000

MW by 2020 mdash a more than 4000-MW increase

over current levels

Another area of signi1047297cant growth for the

hydropower sector in Europe especially in the

central region of the continent is in pumped stor-

age In addition to supplying additional electricity

during times when demand for power is highest

pumped storagersquos ability to balance power pro-

duction and regulate the transmission network in

light of increased use of intermittent renewables

particularly wind is attractive

As many as ten pumped-storage facilities are

under construction including 178-MW Avce in

Slovenia 540-MW Kopswerk 2 in Austria 480-MW Limberg 2 in Austria and 141-MW Nestil

in Switzerland Several more potential projects

are being investigated

Europe also is an established leader in research

and development of new technologies mdash ocean

wave and hydrokinetic Thirty years ago the

United Kingdom had the most aggressive wave

power research and development program in the

world This commitment to research and devel-

opment as well as to commercialization of new

designs continues today throughout Europe

Installed hydropower in Europe totals ap-

proximately 179000 MW European countries

with the largest amounts of hydro include France

Italy Norway and Spain Maintaining and in

many cases upgrading this existing infrastruc-

ture continues to be an important focus through-

out Europe

The emphasis in Western Europe is retro1047297tting

hydro plants with modern equipment usually

upgrading the capacity of the plant In Eastern

Europe the focus is rehabilitating aging plants

that often were allowed to deteriorate during the

era of the Soviet Union

Numerous utilities are committing signi1047297cant

resources to upgrade entire portfolios For ex-

ample here in France national utility Electricite

de France (EDF) is investing more than 2 bil-

lion euros (US$25 billion) as part of Francersquos

economic stimulus program including spending

on modernization of hydroelectric projects In

recent months EDF has issued several solicita-

tions for hydropower equipment and other work

for its many projects including up to 50 turbine-

generators over 1047297ve years

mdash Editors of HRW magazine and HydroWorld

com continually track European project construc-

tion and rehabilitation progress To regularly follow

hydropower development and rehabilitation activitybookmark wwwhydroworldcom

Hydropower in Europe

Current Status Future Opportunities

Ou t l o o k

By Marla J Barnes

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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_______________

8132019 HRW_20090701_Jul_2009

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

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_______________

______________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3244

30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

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Internet wwwstellba-hydrochE-Mail infostellba-hydroch

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Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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________________

________

___________

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

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kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

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(T) +39 0444 479 711 - (F) +39 0444 479 888

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Page 27: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 2744

httphrwhotimscom RS 17

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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wwwhydroworldcom July 2009 HRW 27

Visit us at Waterpower XVI Booth 3005

httphrwhotimscom RS 18

build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

8132019 HRW_20090701_Jul_2009

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

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Page 28: HRW_20090701_Jul_2009

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26 HRW July 2009 wwwhydroworldcom

Imran Sayeed is chief

(geology) for NHPC Limited

which develops and

operates hydroelectric

projects in India

This article has been evaluated

and edited in accordance with

reviews conducted by two or

more professionals who have

relevant expertise These peer

reviewers judge manuscripts for

technical accuracy usefulness

and overall importance withinthe hydroelectric industry

C i v i l C o n s t r u c t i o n

Project Development in the Himalayas

Solving Geotechnical ChallengesDuring hydro project construction in the Himalayas Indian utility NHPC Limited has facedmultiple geotechnical challenges To overcome these the company has implemented anumber of solutions including providing adequate reinforcement for rock slopes and choos- ing tunneling practices to best deal with the rock conditions

layas In addition construction is under way on

800-MW Parbati 2 with its 315-kilometer-long

headrace tunnel and 3000-MW Dibang with a

288-meter-high dam which will be the highest

concrete gravity dam in the world

Hydro development in the Himalayas

The Himalayas are the worldrsquos highest moun-

tain range with more than 100 peaks attaining

a height above 7200 meters In India the Hima-

layas run from west to east through the states of

Jammu and Kashmir Himachal Pradesh Uttra-

khand Sikkim Arunachal Pradesh and Assam

The Indus Ganges and Brahmaputra riv-

ers arise in the Himalayas and 1047298ow toward the

northern plains in India These rivers are fed

by the permanent snow line and glaciers in

the summer and by heavy rainfall during the

monsoon season This arrangement of a steep

fall in the Himalayan river beds together with

perennial discharge forms an ideal setting for

hydropower development

Geotechnical challenges and solutions

In the Himalayas the geological challenges

occur in part from the fact that this mountain

range evolved due to the collision of the Aus-

tralasian and Eurasian plates The rocks were

thrown into several folds and fault zones giv-

ing rise to a disturbed rock mass traversed by

several discontinuities Geotechnical chal lenges

that must be solved include assessing foundation

conditions ensuring stability of high cut rockslopes securing rock slopes during construction

I

n India the Himalaya mountain range has

enormous untapped potential for hydro devel-

opment According to the Central Electricity Au-

thority of India about 80 percent of the 148700

MW of hydro potential in the country comes from

rivers that arise in the Himalayas In fact only 2

percent of the potential in northeastern India and

24 percent of the potential in northern India has

been developed

One signi1047297cant challenge in developing this

potential is the structurally unsound rock and

other issues related to the complexity of the re-

gionrsquos geology Throughout 33 years of develop-

ing hydro projects in this area NHPC Limited

(formerly known as National Hydroelectric Power

Corporation Limited) has developed solutions to

a number of geotechnical problems For example

it is possible to successful ly excavate underground

powerhouses or make high cut slopes for spillways

or surface power stations in the Himalayas by

carrying out detailed investigations and using ap-

propriate rock support systems Other challenges

for which NHPC has developed solutions include

dealing with dif1047297cult foundation conditions lo-

cating construction materials and tunneling in

uncertain rock conditions

Experience shows that it is feasible to build

large dams in the Himalayas despite constraints

the geology imposes For example the highest

concrete gravity dam (Bhakra Dam) highest

rock1047297ll dam (Tehri Dam) longest headrace tun-

nel (associated with the 1500-MW Nathpa Jhakri

project) and largest underground powerhousecavern (Tehri) in the country are all in the Hima-

By Imran Sayeed

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wwwhydroworldcom July 2009 HRW 27

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

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Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

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energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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_________________________

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________

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PAN reg bronzesand

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- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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hydrogilkescomUSA Gilkes Inc

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associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

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Your Partner for

Water Resources and

Hydroelectric Development

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________

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POWER SOLUTIONS

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

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Page 29: HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 27

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build a rock1047297ll dam on a site with shal-

low bedrock

Other factors mdash such as availability

of construction materials and capacity

required for the spillway mdash also plan amajor role in selecting the type of dam

For concrete dams proper investiga-

tion is required to determine the sub-sur-

overburden to this depth is feasible

without much dif1047297culty Deeper excava-

tion involves problems of seepage slope

stability and time required to complete

the work However if suf1047297cient materialsare available for construction of a rock-

1047297ll dam and an adequate spillway can be

provided it could be less expensive to

of above-ground powerhouses locating

construction materials and tunneling

in uncertain rock conditions

Assessing condition of the foundationRivers that arise in the Himalayas have a

high-velocity 1047298ow of water because of the

steep fall The rivers often follow weak

zones of rock such as faults In these ar-

eas deep erosion in the river bed may be

covered by loosely consolidated deposits

These rivers often 1047298ow through narrow

gorges that may be the result of a major

discontinuity Because of this situation

there is a general tendency of an irregu-

lar deep bedrock pro1047297le in many river

sections Choices of viable dam sites of-

ten are limited so proper site selection

in the deep gorges or even in relatively

wider valley sections that may have bur-

ied channels is quite challenging

Choosing a site for a dam in the Hi-

malayas primarily requires careful as-

sessment of foundation conditions For

rivers with deep bedrock (30 meters or

more deep) building a rock1047297ll or con-

crete-faced rock1047297ll dam (CFRD) with a

positive cutoff such as a plastic concrete

diaphragm wall is an effective measure

to avoid the need to excavate down to

the bedrock For example NHPC built

a CFRD at 280-MW Dhauliganga 1

where the bedrock was 65 to 70 meters

deep NHPC also used this solution at

520-MW Parbati 3 which features a

conventional rock1047297ll dam with a clay

core and a cutoff wall to a depth of 40

meters Rock1047297ll was chosen over CFRD

for this site because it is less expensive

than excavating to bedrock and avoids

the construction risk involved in this

practice In addition transporting a

large quantity of cement to the remote

location would be challenging

If the bedrock is shallower than 30

meters construction of a concrete dammay be a better option Excavation of

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

8132019 HRW_20090701_Jul_2009

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28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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8132019 HRW_20090701_Jul_2009

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

______________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3244

30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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8132019 HRW_20090701_Jul_2009

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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Visit us at Waterpower XVI Booth 811

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8132019 HRW_20090701_Jul_2009

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

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cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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__________

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8132019 HRW_20090701_Jul_2009

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

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HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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______________

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_____

________

________

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___________

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________

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POWER SOLUTIONS

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

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life cycle of hydro power plants

bull Plant Assessment bull General Over-

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 30: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3044

28 HRW July 2009 wwwhydroworldcom

Construction of a positive cutoff wall is one solution for dealing with deep bedrock conditions in rivers in theHimalayan mountain region

face bedrock pro1047297le as well as the founda-

tion conditions In situations where there

is a large deviation in foundation depth

problems may include increased excava-

tion water seepage and large increases

in concrete This can cause problems

with regard to a projectrsquos construction

schedule In addition provisions may be

required for treatment of shear zones For

the concrete dams built to impound water

for the 540-MW Chamera 1 and Parbati

2 projects NHPC was able to use a care-

fully planned drilling program to predict

the bedrock conditions quite accurately

Ensuring stability of rock slopes

There are several projects in the Hima-

layas that may involve slope cuts more

than 50 meters high This includes ex-

cavating for building side channel spill-

ways at rock1047297ll dams or for removal of

weathered or slumped rocks which typi-

cally are present at many sites in the Hi-

malayas Removal of these rocks may be

needed to provide a sound foundation

for placement of the dam and a proper

junction between the dam body and

abutments or for building side channel

spillways at rock1047297ll dams Rock condi-

tions play a pivotal role in the design of

such slopes and the need for adequate

rock reinforcementFor 280-MW Dhauliganga 1 a high

Building above-ground powerhouses

For hydro projects in the Himalayas that

involve surface powerhouses slope sta-

bility is a problem Because of the narrow

con1047297guration of the valleys space mustbe created for powerhouses by cutting the

hill slope For Parbati 2 a surface power-

house with hill cutt ing of 100 of 125 me-

ters was planned This powerhouse is in

meta-basics and chlorite schistsphyllites

with three sets of joints This slope has

suffered three collapses due to the deep

cutting Redressing of the slope with

heavy supports is under way The sup-

port elements consist of 35-meter-long

cable anchors 6- to 12-meter-long rock

anchors shotcrete and wire mesh The

entire slope is expected to be completed

by the end of 2009

As the above example illustrates ex-

ecution of slopes particularly in adverse

rock conditions remains a challenge

Depending on the slope height and rock

conditions heavy supports may be re-

quired Generally for high slopes there

is considerable provision of support

measures These supports include long

rock bolts or anchors (9 to 15 meters)

cable bolts treatment by injection of

grout andor use of reinforced concrete

plugs to make small horizontal tunnels

into the slope Proper drainage arrange-

ments also are necessary

Accordingly it is important to provide

suf1047297cient time in the schedule for instal-

lation of systematic supports during

excavation The amount of time needed

depends on the magnitude of the work

The Bureau of Indian Standards

publishes codes of practice for geologi-

cal investigation for dams and power-

houses1 which are followed in India to

perform river valley investigations In

view of the problems faced in the Hi-

malayas and also based on the successes

achieved at some projects the followingsteps are recommended for deep open

slope cut was to be executed on the right

bank in strong biotite gneiss of Pre-Cam-

brian age However the joint patterns of

this rock were such that prominent un-

stable wedges formed When the excava-

tion work began in 2000 blocks as large

as 10000 cubic meters in volume started

to fall from the cut slope

To solve this problem NHPC engi-

neers proposed special support measures

apart from modifying the slope of the

rock Rock supports already proposed

for the situation included 18-meter-long

cable bolts 9- 12- and 15-meter-long

rock anchors shotcrete and wire mesh

The special measures involved reinforc-

ing the rock mass by driving 30-meter-

long tunnels with additional cross-cuts

into the hill slope and then back-1047297lling

the tunnels and cuts with concrete and

steel This solution stabilized the slope

and enabled the project to be commis-

sioned on schedule in March 2005

In this case the large size of the blocks

was detrimental to slope stability and

necessitated modi1047297cations to the slope

angle as well the support measures The

key to success for a high slope excavation

lies in proper investigations design and

support provisions and careful execution

This arrangement is described below for

surface powerhouses where high opencuts may be involved

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

advanced hydropowerservices for our global clients

STRATEGY MANAGEMENT CONSULTING ENGINEERING CONSTRUCTION

GLOBAL REACHL O C A L T O U C H

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Visit us at Waterpower XVI Booth 801

DESIGN bull ANALYSIS bull INSPECTIONS bull CONSTRUCTION MANAGEMENT

CORPORATE HEADQUARTERS PITTSBURGH PENNSYLVANIA USA

PHONE 0014128569700 FAX 0014128569749

Proudly building on 25 years of RCC and DamConstruction Experience

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

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__________

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

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Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

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____________

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36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

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Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

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Your Partner for

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Hydro Power

We generate added value for you

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Page 31: HRW_20090701_Jul_2009

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MWH the wet infrastructureleader is committ ing to theconservation and controlof the worldrsquos irreplaceableresource ndash water Join us inproviding the most technically

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 23

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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Visit us at Waterpower XVI Booth 3016

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________________

________

___________

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

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IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

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AXYS GHG SentinelAXYS GHG SentinelTMTM

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_______________

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__________

8132019 HRW_20090701_Jul_2009

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34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

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0 9Booth 1001

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Page 32: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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30 HRW July 2009 wwwhydroworldcom

For high cut slopes in the Himalayas use of proper excavation and support methods are important to ensurestability during hydro project construction The photo on the left shows high cut slopes with vulnerable jointsIn the right photo pre-stressed cable bolts are being used to support the slope

excavations for surface powerhouses or

for high cut slopes for other structures

mdash Complete geotechnical mapping

on a 11000 scale covering the entire

area of the cut slope as well as about 50meters on the sides and above the top of

the proposed cutting line

mdash Excavate two to three test tun-

nels to probe the slumped or weathered

zones and determine the nature of any

discontinuities

mdash Dri ll two to three holes beyond

the periphery at an elevation 10 to 20

meters above the top of the cut line to

delineate the overburden and weathered

or slumped rock that must be dealt with

immediately as the cutting begins and to

ascertain the quality of rock in deeper

excavations and thus both establish pre-

treatment before commencing actual

excavation and determine the adequacy

of rock supports

mdash Perform laboratory tests on rock

samples to determine physical and engi-

neering properties

mdash Perform in-situ rock mechanic tests

for shear strength modulus of deforma-

tion and elasticity separate tests may be

necessary for shear strength along joint

planes

mdash Include suf1047297cient provisions for

rock support according to numerical

analysisdesign calculations and proper

scheduling in the tender for the works or

contract with the executing agency

mdash Use controlled blasting and im-

mediate quick rock support during

execution of a high cut slope (height

of unsupported areas may not be more

than 2 meters for individual excavation

rounds) and

mdash Use pre-strengthening measures

like grouting in weak rocks or vulnerable

areas

Locating construction materialsThe choice of a dam type greatly de-

projects in the Himalayas Since 1975

NHPC has completed more than 200

kilometers of tunnels in the region Al-

though many projects with tunnels

have been completed in the Himalayas

by other companies as well some have

taken a decade or more with the delays

mainly attributed to tunnel completion

Contractors cite poor rock conditions

as the prime reason for cost and time

overruns

Keys to successful tunneling include

mdash Invest igation and rock mechanics

testing before construction begins to

develop a suitable tunneling method se-

lect support elements for different types

of rock estimate the quantity of work to

be performed and identify geohazards

that require treatment (such as fractured

and crushed rock zones fault crossings

water ingress under high pressure and

rock burst areas) and

mdash Provision of immediate primary

support in the heading portions consist-

ing of shotcrete or 1047297ber-reinforced shot-

crete together with rock bolts When this

support is not in place there are l ikely to

be collapses and subsequent disruptions

to the work

The tailrace tunnel for 480-MW

Uri 1 provides an example of ef1047297cientsupport methods in poor and highly

pends on the availability of construction

materials In the Himalayas the rocks

contain a considerable percentage of free

mica rendering them unsuitable for use

as aggregate In addition because of the

steep bed slopes in the rivers the occur-

rence of suitable river shoals or terrace

deposits is rare This results in greater

dependence on rock quarries

Detailed work is required to choose

safe and environmentally benign loca-

tions for quarries This work involves

studying the available rock types (which

could be used for aggregate) and per-

forming surveys testing and con1047297rma-

tion regarding exploitable quantities

The optimal choice is to locate quarries

in the area that will be submerged when

the reservoir is impounded because this

avoids affecting new areas If suitable

deposits are not found in the reservoir

area alternative locations for the quarry

are identi1047297ed along with a plan for res-

toration of the quarry site after construc-

tion work is complete Such restoration

plans are now part of the environmental

management plan included in the en-

vironmental impact assessment for all

NHPC projects

Tunneling in uncertain rock conditionsTunneling is an intrinsic part of hydro

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httphrwhotimscom RS 23

httphrwhotimscom RS 24

Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

httphrwhotimscom RS 26

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Visit us at Waterpower XVI Booth 3016

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________________

________

___________

8132019 HRW_20090701_Jul_2009

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3544

Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

_________

__________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3644

34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

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___________

8132019 HRW_20090701_Jul_2009

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wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

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8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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________

_________________________

___________

________

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_______

8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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________

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___________

________

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8132019 HRW_20090701_Jul_2009

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8132019 HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

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Page 33: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3344

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Our services

Engineering

Assembly work Site erection

Production in own workshops

Preventive wear protection

Your partner for hydropower

Refurbishment

Modernization

Automation Control systems

Hydraulic steelwork

Internet wwwstellba-hydrochE-Mail infostellba-hydroch

Stellba Hydro AGLanggas 2CH-5244 BirrhardSwitzerland

Telefon

Telefax

+41 (0)56 201 45 20

+41 (0)56 201 45 21

Internet wwwstellbadeE-Mail infostellbade

Stellba Hydro GmbH + Co KGBadenbergstrasse 30D-89520 HeidenheimGermany

Telefon

Telefax

+49 (0)7321 96 92 0

+49 (0)7321 6 20 73

Hydro

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Visit us at Waterpower XVI Booth 3016

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________________

________

___________

8132019 HRW_20090701_Jul_2009

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3544

Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

_________

__________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3644

34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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________________

___________________

8132019 HRW_20090701_Jul_2009

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Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

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8132019 HRW_20090701_Jul_2009

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PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

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UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

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All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

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8132019 HRW_20090701_Jul_2009

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

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Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

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WATERPOWER XVI

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 34: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

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32 HRW July 2009 wwwhydroworldcom

stressed rock conditions Along the

course of the 2-kilometer-long tunnel

the contractor encountered a folded

thrust zone between the sedimentary

formation and the meta-volcanics Ac-cording to the geomechanical classi1047297ca-

tion developed by ZT Bieniawski the

rock encountered in the tunnel included

1 percent class II 49 percent class III

28 percent of class IV and 22 percent

class V There are 1047297ve rock classes in

the geomechanical classi1047297cation from I

(very good) to V (very poor)

Despite the poor rock quality at

this site no steel arches were needed

for support nor was there a single in-

stance of cavities or heavy overbreak

(Overbreak is rock excavated in excess

of that needed to install the tunnel In

this case overbreak would result from

weak rock or close fractures or shear

zones that could not be controlled)

Support elements used at this site

consisted of pre-grouting of the rock

mass division of the tunnel section

into several parts for easier excava-

tion in poor rock application of 200-

to 250-millimeter-thick shotcrete

with a double layer of wire mesh and

water-expanding bolts and grouted

dowels Successful completion of Uri

1 brought about changes in tunneling

techniques in the Himalayas particu-

larly with respect to the use of flex-

ible supports and pre-grouting as a

stabilization measure The tunneling

method used at this site designed by

Sweco of Sweden is based on t he New

Australian Tunneling Method The

civil contractor was Uri Civil Contrac-

tor AB a Swedish-British consortium

led by Skanska

The use of tunnel boring machines

in the Himalayas has met with lim-

ited success The Parbati 2 project is a

good example This project involvestrans-basin water transfer between two

silt emerged from a probe hole under

high pressure with a discharge of

5000 to 6000 liters per minute This

caused inundation of the tunnel for

nearly 2 kilometers and the tunnel bor-ing machine was virtually buried under

silt The discharge slowly subsided to

2000 liters per minute and continues

more than two years after the leak be-

gan As of February 2009 discharge

had reduced to 1350 liters per minute

An expert group consisting of experts

in contracts civil design cost engineer-

ing geology and 1047297nancing has recom-

mended options for treating the dif1047297cult

zone so that the balance of the tunnel-

ing can be completed These options

include building a bypass tunnel and

treating the weak zone by grouting

Conclusions

Development of the nearly 119000 MW

of hydro potential from rivers in India

that arise in the Himalayas relies on

1047297nding solutions to challenges posed by

the regionrsquos complex geology Through

33 years of experience developing hydro

projects in this area NHPC Limited

has developed solutions to a number of

geotechnical problems These solutions

have allowed construction of some of the

largest dams and hydraulic structures in

the world

The views expressed in this article are

those of the author and not of NHPC

Limited management

Note

1Code of Practice for Sub-Surface Investigation

for Power House Sites IS 10060 1981

Bureau of Indian Standards (BIS) New

Delhi India 1981 and 2004 A number of

other standards for geotechnical investiga-

tion and subsurface exploration are avail-

able under Division 14 Water ResourcesSection WRD-5 of the BIS

rivers via a 315-kilometer-long head-

race tunnel This is one of the longest

water-conducting tunnels in the world

Total tunneling for the project which

includes feeder tunnels and access aditsis 572 kilometers Construction of this

project began in 2002 and is scheduled

to be complete in 2010 according to the

revised program

One element of success at this project

involved use of a double shield inclined

tunnel boring machine to excavate two

inclined pressure shafts These shafts

are 1546 meters in length and 35 me-

ters in diameter at a dif1047297cult angle of 30

degrees and run through meta-basics

and chlorite schist bands Progress in

the second pressure shaft was so fast that

the tunnel was completed in 136 days in

2006 The main reason for the success of

this tunnel boring machine is the moder-

ate strength of the meta-basics which is

amenable to boring without dif1047297culty

Use of an open shield tunnel boring

machine to complete the portion of the

headrace tunnel that passes below a high

ridge met with less success Initially the

machine worked fairly well in granite

gneiss schistose gneiss and schist bands

However progress slowed as the tunnel

entered quartzites and heavy-duty cut-

ters were required Simultaneously as

the rock cover on the tunnel increased to

800 to 1000 meters the jointed quartz-

ite gave rise to wedge failures near the

cutter head

Because there were site limitations to

using shotcrete the contractor used wire

mesh with channels in the crown por-

tion together with rock bolts as support

measures in class III conditions In class

IV and some area of class III ring beams

were used

From 4000 meters onwards the

tunnel encountered closely jointed

zones and silt-1047297lled discontinuities inthe tunnel At 4056 meters water and

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

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Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

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_______________

_________

__________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3644

34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 35: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3544

Environmental Monitoring SolutionsEnvironmental Monitoring Solutions

Made to MeasureMade to Measurehelliphellip

See us at

IHA rsquo09 in Reykjavik

Waterpower XVI in Spokane

Booth 716

ContinuousContinuous

automatedautomated

monitoring systemmonitoring system

for greenhouse gasfor greenhouse gas

concentrations inconcentrations in

freshwaterfreshwater

environmentsenvironments

AXYS GHG SentinelAXYS GHG SentinelTMTM

httphrwhotimscom RS 27 httphrwhotimscom RS 28

httphrwhotimscom RS 29 Visit us at Waterpower XVI Booth 2004

Visit us at Waterpower XVI Booth 811

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

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_______________

_________

__________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3644

34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 36: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3644

34 HRW July 2009 wwwhydroworldcom

New Hydro

Aquamarine Airtricity plan

1000 MW of ocean energyAquamarine an af1047297liate of Scottish and

Southern Energy (SSE) and renewable

energy developer Airtricity a division of

SSE are working to develop 1000 MW

of wave energy sites in the British Isles

by 2020

Aquamarine and Airtricity agreed

in February 2009 to form a 50-50 joint

venture to develop sites off the United

Kingdom and Ireland They said work

on the 1047297rst two sites has begun with

plans to advance additional sites over

three years

Wheeler said the agreement gives

Airtricity a wind and hydro developer

a 1047297rst option on sites developed with

Aquamarine expertise said Airtricity

Director Stephen Wheeler

Study finds extensive ocean

power potential in Chile

A study by the Inter-American Devel-

opment Bank (IADB) 1047297nds Chile has a

high potential for wave and tidal energy

development

Energy Minister Marcelo Tokman

said the report con1047297rms that Chile has

great potential for ocean energy and

details steps to follow in developing the

new energy source

The report identi1047297es attributes and

criteria for project selection and identi-

1047297es priority areas to establish projects It

also indicated a need to implement spe-

ci1047297c measurements of ocean generating

potential in certain areas of the country

In addition the report said it is necessary

to review site plans and existing infra-

structure to take advantage of generation

opportunities

IADB is to promote research of the

new technologies to support creation of

a new market in Chile that can exportknowledge to the world The government

of Chile previously announced plans to

create a renewable energy center to serve

as a clearinghouse and sponsor of non-

conventional renewable energy sources

for Chile and for South America

The study was conducted by IADB

in coordination with Chilersquos economic

development agency Corporacion de

Fomento de la Produccion (Corfo) and

Comision Nacional de Energia

Israel wave energy developer

to supply units to China

Israel wave energy developer SDE En-

ergy Ltd will supply wave plants to Chi-

na with the 1047297rst installation planned off

Guangdong Province in southern China

SDE Managing Director Shmuel

Ovadia said two joint venture companies

formed to implement the agreement plan

to build an initial model in Guangzhou

It is to be deployed by the end of 2009

Once the model has been proven Ovadia

said the companies will begin installing

the plants in China

The Chinese government must ap-

prove the installations and is to purchase

electricity generated by the plants Ova-

dia said Construction of the wave power

plants is to be 1047297nanced by investors from

Hong Kong and China

SDErsquos technology converts the ver-

tical motion of waves into hydraulic

pressure which is then used to generate

electricity The units which are installed

on breakwaters rest on the surface of the

ocean and are connected to the break-

water by a hydraulic arm The units can

produce energy from both the rising and

falling of waves

Ovadia said to date SDE has built eight

model wave power plants with 1047297nancialassistance from the chief scientist of Is-

raelrsquos Ministry of Industry and Trade

Oceanlinx receives Australian

development grant

Oceanlinx Ltd of Australia is using

a A$295 million (US$193 million)

grant from the Australian government

to design and test the next generation

of Oceanlinx technology The grant

awarded under the AusIndustry Climate

Ready program is to be matched by

Oceanlinx

The technology Oceanlinx is develop-

ing consists of wave generators tethered

to the sea bottom that use oscillating

water column technology Wave action

compresses air inside the unit and that

compressed air turns turbine-generators

to produce electricity

Oceanlinx said it successfully re-

deployed its full-scale wave energy con-

version unit at Port Kembla Australia

in early February for continued testing

First deployed in 2005 the unit has been

undergoing planned refurbishment and

modi1047297cations for several months

Brieflyhellip

Voith Hydro and RWE Innogy formed

Voith Hydro Ocean Current Technol-

ogies to develop ocean current power tech-

nologies and projects The German compa-

nies said investment would total 30 million

euros (US$378 million) over the next few

years Finland-based utility Fortum

and Swedish wave generator developer

Seabased Industries are seeking govern-

ment support to develop a 10-MW wave

energy project off the west coast of Sweden

Continued on page 38

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 37: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3744

Visit us at Waterpower XVI Booth 105

httphrwhotimscom RS 30

wwwhydroworldcom July 2009 HRW 35

Small Hydro

Uganda names Norway firm

to build 75-MW Birara RiverThe government of Uganda named Ja-

cobsen Elektro AS of Norway to build

a 75-MW hydroelectric project on the

Birara River

The state-run New Vision said the

project on the border of Kanungu and

Rukungiri districts will be supervised

by the Uganda Rural Electri1047297cation

Agency

Jacobsen Elektro also contracted New

Plan Consulting Engineers to perform

a feasibility study and environmental

impact assessment New Plan is to com-

plete the 1047297rst phase of the study and as-

sessment by the end of 2009

Of1047297cials of Jacobsen Elektro and the

Uganda Ministry of Energy and Mineral

Development are to examine the results

after which construction is to begin

Australia consultant to plan

expansion of 4-MW Afulilo

Samoarsquos Ministry of Finance has named

SMEC International Pty Ltd of Aus-

tralia to develop a plan to augment the

capacity of Samoarsquos 4-MW Afulilo hy-

droelectric project

SMEC received a US$1 million con-

tract to prepare the Afulilo Environmen-

tal Enhancement Project

Turbine rehab awarded for

Swedenrsquos 9-MW Edsforsen

Hydropower operator Fortum Genera-

tion AB awarded a contract to Litostroj

EI of Slovenia to refurbish two turbines

at the 9-MW Edsforsen project on Swe-

denrsquos Klaralven River

Litostroj will supply two new Kaplan

turbine runners and perform related re-

furbishment work at the Edsforsen plant

which was built in 1949

Work is to include design and equip-ment for refurbishing the vertical shaft

units with new runners new inner head

covers new turbine shafts and other

parts Work is to be performed in 2010

and 2011

Austria agency names supplier

for Kainischtraun piping

Osterreichische Bundesforste AG (OBf)

named Austrian 1047297rm Etertec Tiefbau

GmbH to supply pressure piping for the

35-MW Kainischtraun hydroelectric

project

Etertec Tiefbau GmbH is supply-

ing 3600 meters of pressure pipe and

1047297ttings for the small hydro project in

Kainisch and Bad Aussee

ESHA celebrates anniversary

and achievements

The European Small Hydropower As-

sociation (ESHA) is celebrating its 20th

anniversary this year

Looking toward the future ESHA

said a newly adopted renewable energy

sources directive paving the way for 20

percent renewable energy by 2020 will

bring a new drive for sustainable hy-

dropower development in the European

Union (EU)

The organization also said it plans

to continue to represent the interest

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

____________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 38: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3844

36 HRW July 2009 wwwhydroworldcom

Visit us at Waterpower XVI Booth 2011httphrwhotimscom RS 31

of sustainable hydropower within the

renewable energy family thereby con-

tributing to EUrsquos security of energy

supply to economic development andto abatement of climate change

Representation over 20 years has

served to position the small hydro

sector and enabled it to effectively

promote the beneficial use of hydro-

power in the EU ESHA said It has

helped encourage the development

of small hydropower mdash projects with

an installed capacity of up to 10 MW

mdash through lobbying and other act ivi-

ties including conferences seminars

workshops and studies

The non-pro1047297t association based

in Brussels Belgium promotes small

hydro plants and emphasizes environ-

mental integration ESHA was created

through an initiative of the European

Commission in 1989 and has repre-

sented the interests of the small hydro-power sector in the EU since that time

ESHA is a founding member of the

European Renewable Energy Council

It also is a member of the Alliance for

Rural Electri1047297cation

Mavel equips refurbishment of

Finlandrsquos 862-kW Finnholm

Czech equipment supplier Mavel as re-

ceived a contract from Vaasa Engineer-

ing Oy of Finland to supply a turbine for

refurbishment of the 862-kW Finnholm

hydroelectric project on Finlandrsquos Ahta-

vanojoki River

Mavel said it is to provide a double-

regulated Kaplan bulb turbine steel

intake draft tube and lubricating and

cooling system The Mavel KA1800K4

turbine has a runner diameter of 1800millimeters and four runner blades

Finnholm which is owned by Oy

Herrfors Ab has a net head of 535 me-

ters and a 1047298ow of 185 cubic meters per

second Mavel expects to commission

the unit in September 2009

On line reports Macedonia

Norway Panama Peru

New and refurbished small hydropower

projects in Macedonia Norway Pana-

ma and Peru are now operating

Utility EVN Macedonia brought

on line the refurbished and upgraded

96-MW Matka hydroelectric project

on Macedoniarsquos Treska River The

Macedonian Information Agency said

Hydropol of the Czech Republic re-

furbished Matka under a concession

to modernize and manage seven small

hydro plants New turbines and other

equipment were supplied by GE Nor-

way while generators were provided by

INDAR Spain Matka formerly total-

ing 37 MW was built in 1938

Norway utility Statkraft began op-

eration of the 29-MW Rodberg hydro-

electric project in Norwayrsquos Buskerud

County The project uses 60 percent

of the water drop between the 206-

MW Nore 1 and 63-MW Nore 2 hydro

projects by using the minimum 1047298ow

release from Rodberg Dam The plant

is to have an average annual genera-

tion of 155 gigawatt-hours Statkraft

said development of Rodberg meets

the governmentrsquos and Statkraftrsquos goal

of upgrading and extending its existing

hydropower projects

Developer Istmus Hydro Power Corp

has commissioned its 10-MW Concep-

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

___________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 39: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 3944

wwwhydroworldcom July 2009 HRW 37

Visit us at Waterpower XVI Booth 2001

Visit us at Waterpower XVI Booth 803

httphrwhotimscom RS 32 httphrwhotimscom RS 33

cion hydropower project on the Piedra

River in Panamarsquos Chiriqui Province

The project is 500 kilometers west of

Panama City in the Chico River BasinEquipment supplier Mavel as of the

Czech Republic said Istmus Hydro con-

tracted a consortium of ABB Inc and

Mavel to provide equipment and super-

vise installation and commissioning

Canada tungsten miner Malaga

Inc placed the 600-kW Pasto Bueno

project into commercial operation on

the Pelagatos River at Malagarsquos Pasto

Bueno mining operation in northern

Peru Hidropesac Malagarsquos joint hydro

venture with Emerging Power Develop-

ers SA of Switzerland and Peru energy

company Electrokraft SA brought the

projectrsquos 450-kW horizontal and 150-kW

vertical Pelton turbines on line Stucky

Ltd of Switzerland assisted the develop-

ment Hidropesac invested more than

US$3 million in the project Construc-tion was 1047297nanced through sale of carbon

credits under the United Nationsrsquo Clean

Development Mechanism

Briefly hellip

The board of Brazilrsquos Agencia Na-

cional de Energia Eletrica (ANEEL)

approved the application of Casa de

Pedra Energia Ltda to act as an inde-

pendent power producer by deploy-

ment and operation of the 8-MW Rio

dos Indios hydro project ANEEL also

authorized Ferro Liga Ltda to act as

a self-generator of electricity through

development and operation of 15-

MW Maria Celia Mauad Notini in

Minas Gerais State hellip The African

Development Bank approved a loan

and a grant totaling 11 million Units ofAccount (US$164 million) to fund an

electricity supply project in Leso-

tho The project focuses on renewable

energy including mini-hydropower

projects hellip Abu Dhabi National En-

ergy Co acquired a 50 percent stake

in the Caribbean portfolio of Mar-

ubeni Corp including 40 percent of

Jamaica Public Service Co and its

eight small hydroelectric plants totaling

21 MW The US$320 mil lion deal forms

a joint venture portfolio of equity stakes

in generation and transmission facilities

in Jamaica the Bahamas Trinidad and

Tobago and Curacao

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

________________

___________________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 40: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4044

Professional Listings

New Hydro (continued)

The 1047297rms submitted an application of interest to the Swedish En-

ergy Agency for investment support of a full-scale wave power site

to utilize 500 generating units hellip Swedish utility Vattenfall has

acquired a 51 percent stake in Pandion Ltd an Irish ocean ener-

gy site development company for 500000 euros (US$648225)

Vattenfall said ocean energy developer Wavebob Ltd will hold

the remaining 49 percent of Pandion which has applied for ocean

energy sites on the west coast of Ireland hellip British engine and

power systems maker Rolls-Royce plans to embark on sea trials

of a 500-kW tidal power turbine-generator in the United King-

dom in the summer of 2009 said Ric Parker director of research

and technology The unit was developed with Tidal Generation

Limited Rolls-Royce says it plans to test a 1-MW version about

18 months later hellip Npower renewables and wave energy de-

veloper Wavegen are moving forward with development of the

4-MW Siadar Wave Energy Project on the Isle of Lewis in

the Hebrides Islands of Scotland The companies received con-

sent from the Scottish government for the project

httphrwhotimscom RS 34

httphrwhotimscom RS 400

httphrwhotimscom RS 403 httphrwhotimscom RS 404 httphrwhotimscom RS 405

httphrwhotimscom RS 401

httphrwhotimscom RS 402

Visit us at Waterpower XVI Booth 808

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

__________

__________

________

_________________________

___________

________

________

_______

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 41: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4144

httphrwhotimscom RS 406 httphrwhotimscom RS 407 httphrwhotimscom RS 408

PAN reg bronzesand

PAN reg -GFself-lubricating bearings

Since 1931

- Superior quality withbull Highest wear resistance

bull Low maintenance bull Or maintenance free

- Extended operating life

PAN-MetallgesellschaftPO Box 102436 bull D-68024 Mannheim Germany

Phone + 49 621 42 303-0 bull Fax + 49 621 42 303-33

kontaktpan-metallcom bull wwwpan-metallcom

httphrwhotimscom RS 409httphrwhotimscom RS 410

httphrwhotimscom RS 411

UK Gilbert Gilkes amp Gordon LtdCanal head North Kendal

Cumbria LA9 7BZ

hydrogilkescomUSA Gilkes Inc

gilkesgilkesinccom

JAPAN Gilbert Gilkes amp Gordon Ltd

h-yamamorf6so-netnejp

HYDRO AND POWER SYSTEMSReliable and innovative solutions utilizing over

150 years continuous hydro electric

turbines generators controls switchgear and

associated plant up to and around 20MW

httphrwhotimscom RS 412 httphrwhotimscom RS 413 httphrwhotimscom RS 414

All Services for Complete Solutions

bull from concept to completion and operation

bull from projects to complex systems

bull from local to multinational schemes

bull for public and private developers

Lahmeyer International GmbH

Friedberger Strasse 173 middot D-61118 Bad Vilbel Germany

Tel +49 (6101) 55-1164 middot Fax +49 (6101) 55-1715

E-Mail berndmetzgerlahmeyerde middot httpwwwlahmeyerde

Your Partner for

Water Resources and

Hydroelectric Development

httphrwhotimscom RS 415 httphrwhotimscom RS 416 httphrwhotimscom RS 417

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

______________

_________

_____

________

________

__________

__________

___________

________

________

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 42: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4244

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4344

POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

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0 9Booth 1001

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Page 43: HRW_20090701_Jul_2009

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POWER SOLUTIONS

MARELLI MOTORI SpA

VIA SABBIONARA 1 - 36071 ARZIGNANO (VI) - ITALY

(T) +39 0444 479 711 - (F) +39 0444 479 888

wwwmarellimotoricom salesmarellimotoricom

Visit us at Waterpower XVI Booth 215httphrwhotimscom RS 35

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Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

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| | | | | |Previous Page Contents Zoom in Zoom out Front Cover Search Issue Next PageRW F

Page 44: HRW_20090701_Jul_2009

8132019 HRW_20090701_Jul_2009

httpslidepdfcomreaderfullhrw20090701jul2009 4444

Hydro Power

We generate added value for you

Service amp Rehab provides solutions

products and services over the entire

life cycle of hydro power plants

bull Plant Assessment bull General Over-

haul bull Rehabilitation bull Upgrading and

Modernization bull Integrated Plant

Control ldquoNEPTUNrdquo bull Feasibility Studies

bull Residual Life Analysis bull Risk Assess-

ment bull Training Services The combi-

nation of our global competence

with our local presence guarantees

competent and on-the-spot response

Service amp Rehab ndash Your partner nearby

WATERPOWER XVI

V i s

i t us a

t

J

u l y

2 7 -3 0 2 0

0 9Booth 1001

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