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GandhinagarGandhinagar Institute Of TechnologyInstitute Of Technology


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` Ocean tides are created from the gravitational pull

of the moon and the rotation of the earth, causing

the tides to ebb and flow twice a day. Only certain

areas in the world are economically viablelocations to harness the power of the tides.

` Thats because the difference between the high

tide and low tide must be more than 16 feet to

harness tidal enough power needed to produceelectricity 2.


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` Tides generated by the combination of the moon

and suns gravitational forces

` Greatest affect in spring when moon and sun

combine forces` Bays and inlets amplify the height of the tide

` In order to be practical for energy production, the

height difference needs to be at least 5 meters

` Only 40 sites around the world of this magnitude` Overall potential of 3000 gigawatts from

movement of tides


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` If one was built across theSevern Estuary, the tidesat Weston-super-Marewould not go out nearly as

far - there'd be water toplay in for most of the time.

` But the Severn Estuarycarries sewage and otherwastes from many places(e.g. Bristol & Gloucester)out to sea. A tidal barragewould mean that this stuffwould hang aroundWeston-super-Mare anawful lot longer!


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Rising Tide Time


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Ebb Tide TimeEbb Tide Time


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` Once you've built it, tidal power isfree.

` It produces no greenhouse gases orother waste.

` It needs no fuel.

` It roduces electricit reliabl .


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` Not expensive to maintain.

` Tides are totally predictable.

` Offshore turbines and vertical-axis turbines are not

ruinously expensive to build and do not have alarge environmental impact.


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` A barrage across an estuary is very expensive tobuild, and affects a very wide area - the environmentis changed for many miles upstream and downstream.Many birds rely on the tide uncovering the mud flats

so that they can feed. Fish can't migrate, unless "fishladders" are installed.

` Only provides power for around 10 hours each day,

when the tide is actually moving in or out.

` There are few suitable sites for tidal barrages


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` Presently costly Expensive to build and maintain

A 1085MW facility could cost as much as 1.2 billion dollars toconstruct and run

` Connection to the grid

` Technology is not fully developed

` Barrage style only produces energy for about 10 hoursout of the day

` Barrage style has environmental affects Such as fish and plant migration

Silt deposits

Local tides change- affects still under study


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` Tidal Power is renewable

` Doesn't cause pollution, doesn't need fuel

`A tidal barrage is very expensive to build

` Only works when tide is going in or out


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` A tidal barrage affects a large area

` There are very few places that you could sensiblybuild a Tidal barrage

` Underwater turbines may be a better bet than abarrage - they are cheaper and don't have the

huge environmental impact.


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