MARKET SYSTEM RELEASE UPDATE

Modifications Committee Meeting

25 September 2012

• Two releases have been scheduled to address a number of defects that were identified in the run-up to and subsequent to IDT go-live.

• SEM R2.0.1 – deployed successfully on Sep. 18th

• SEM R2.0.2 – awaiting delivery from vendors

• SEM R2.0.2 is required due to the identification of a “Long Day” defect after delivery of SEM R2.0.1. It needs to be addressed independently as the next bi-annual release (Nov.) is after the Long Day transition.

SEM R2.0.1 & SEM R2.0.2 – IDT “Wash-Up”

• The Approved scope for SEM R2.1.0 is as follows:

• The deployment date has been set to Friday Nov. 16th due to SEMO and vendor resourcing constraints - only deployment date affected – all other aspects are on schedule.

SEM R2.1.0 – Scope

Mod Ref CR Ref Description

Mod_40_10 SEM_PC_CR254 Differentiation between Dwell Times and Dwell Trigger Points While Ramping Up and Ramping Down

Mod_42_10 SEM_PC_CR255 Changes to the Single Ramp-Up Rate and the Single Ramp-Down Rate calculation.

Mod_01_11 SEM_PC_CR258 UI Payments for Generator Units.

Mod_06_11 SEM_PC_CR259 Increasing maximum daily submission number and automating cancellation of Settlement Reallocation Agreements.

Mod_10_11 SEM_PC_CR274 Interconnector Under Test.

Mod_12_11 SEM_PC_CR275 Interconnector Unit Loss Adjustment when Exporting

Mod_21_11 SEM_PC_CR280 UI Payments for Generator Units Constrained On

SDS SEM_PC_CR207 Automation of FMOC Calculation

SDS SEM_PC_CR260 Additional MI-AMP Feed

SDS SEM_PC_CR261 Removal of orphan Trading Site Settlement Points

SDS SEM_PC_CR266 Change of Effective Date in the MPI

SDS SEM_PC_CR267 Wind and Load Forecast Data

SDS SEM_PC_CR286 Publication of Zero MIUNs when no PQ Pairs available

• In addition, the proposed solution to the “Extreme Ramping” Scenario identified in the MIUN Calculation software will be implemented as part of this release.

• SEMO has issued various communications on this item and delivered a related presentation to the Market Operator User Group on Sep 18th.

• SEMO will be submitting a Modification Proposal in respect of the proposed solution, amending the MIUN Calculator rules as set out in Agreed Procedure 2.

SEM R2.1.0 – Scope – MIUNs Firmness

SEM R2.2.0 – Apr. 2013 – Scope

• Regulatory approval was received on Sep. 18th for the final scope for SEM R2.2.0.

• The approved scope is as follows:

Mod Ref CR Ref Description

Mod_17_11 SEM_PC_CR281 Addition of a D+3 DI report

Mod_03_12 SEM_PC_CR290 Alignment of T&SC with Revised VAT arrangements

SDS SEM_PC_CR193 TLAF Publishing in the MPI

SDS SEM_PC_CR262 Unit Under Test Submission Screen

SDS SEM_PC_CR289 Internal Submission Gates Option 1

SDS SEMPC_CR295 MA System Summary IC Flows

SEM R2.3.0 – Oct. 2013 – Release Cut-Off Date

• The release cut-off date for the October 2013 release to the Central Market Systems is:

Friday February 22nd, 2013.

• All approved Modifications Proposals will be allocated to this release (subject to available capacity).