MARKET SYSTEM RELEASE UPDATE Modifications Committee Meeting 31 January 2012

Scope for SEM R was as follows: Release was deployed successfully on Friday October 21 st, 2011 in conjunction with the deployment of the new Auction Management Platform (AMP). SEM R – Oct Change RequestDescription SEM_PC_CR172MIUN Calculation

Scope for SEM R was as follows: Release was deployed successfully on December 15 th, Change Requests were raised during testing with AMP. Changes were delivered by MIUN Calculation solution vendor and not CMS vendors (ABB / Navita). Changes did not impact on interfaces between the CMS and Participant systems. SEM R – Dec Change RequestDescription SEM_PC_CR282RUN_TYPE on SFTP D+1 MIUN Files SEM_PC_CR283Import of IUNs from MI

Scope for SEM R2.0.0 is as follows: SEM_PC_CR284 added to scope on Dec 2 nd Change to the vendor design to ensure alignment of IDT solution with High Level Design Summary agreed at the Modifications Committee. SEM_PC_CR287 added to scope on Dec 12 th, Minor change included to align with the T&SC and to ensure Participants could effectively manage Credit Cover under IDT. SEM R2.0.0 – Intra-Day Trading - Scope Change RequestMod RefDescription SEM_PC_CR22218_10Intra-Day Trading SEM_PC_CR244SO Security (Option 1) SEM_PC_CR25643_10Variable Price Taker Generator Units and Firm Access SEM_PC_CR28418_10Data to be Utilised when MSP Software Cancellation Run occurs SEM_PC_CR287Inclusion of Breach Amount in the Credit Risk Report

Major activities and associated schedule for the project are as follows: The project is on schedule across all workstreams. * subject to successful completion of testing SEM R2.0.0 – Intra-Day Trading – Project schedule ActivityScheduleStatus Detailed RequirementsDec 1 st, 2010 – Apr 30 th, 2011Complete Vendor Detailed DesignMay 1 st, 2011 – Jul 29 th, 2011Complete Design Deliverables Issued to Participants (MPUD etc.) Aug 29 th, 2011Complete Participant Engagement Plan publishedSep 9 th 2011Complete Participant Systems Design WorkshopsSep 28 th, Oct 5 th 2011Complete Vendor ImplementationJun 20 th, 2011 – Nov 11 th, 2011Complete Factory TestingNov14 th, Dec 23 rd, 2011Complete System Integration TestingJan 3 rd, Apr 27 th, 2012In Progress Market TrialApr 30 th, 2012 – Jul 6 th, 2012 DeploymentJul 20 th, 2012*

Major activities and associated schedule for the Technical Workstream: SEM R2.0.0 – Intra-Day Trading – Technical Workstream ActivityScheduleStatus Technical Infrastructure DesignApr-May 2011 Complete Hardware ProcurementJun-Jul 2011 Complete Hardware Installation (EirGrid & SONI)Aug-Sep 2011 Complete Data Network CommissioningOct 2011 Complete Non-Production Test Environments BuildNov Feb 2012 In-Progress Data Centre Capacity Uplift (SONI)Feb-Mar 2012 In-Progress Production Environments Build (Eirgrid & SONI)Jan 2011-Feb 2012 In-Progress Infrastructure Technical TestingFeb-Mar 2012 High Availability & Disaster Recovery TestingMar-Apr 2012 Operational Acceptance TestingMay-Jun 2012 Go-Live Migration RehearsalsMay-Jul 2012 Go-LiveJul 20, 2012

The Modification Proposals approved for inclusion in scope for SEM R2.1.0 are as follows: SEM R2.1.0 – Oct Mod RefCR RefDescription Mod_40_10SEM_PC_CR254Differentiation between Dwell Times and Dwell Trigger Points While Ramping Up and Ramping Down Mod_42_10SEM_PC_CR255Changes to the Single Ramp-Up Rate and the Single Ramp-Down Rate calculation. Mod_01_11SEM_PC_CR258UI Payments for Generator Units. Mod_06_11SEM_PC_CR259Increasing maximum daily submission number and automating cancellation of Settlement Reallocation Agreements. Mod_10_11SEM_PC_CR274Interconnector Under Test. Mod_12_11SEM_PC_CR275Interconnector Unit Loss Adjustment when Exporting Mod_21_11SEM_PC_CR280UI Payments for Generator Units Constrained On

SEM R2.1.0 – Oct The release cut-off date for the October 2012 release to the Central Market Systems was Friday, November 18 th, Two meetings of the Change Control Forum (CCF) were held to determine the non-T&SC release scope, i.e. Changes routed through the SEM Design Service (SDS). A SEM R2.1.0 release scope proposal paper has been issued to the RAs outlining the complete release scope. Once approval has been received from the RAs the release scope will be published to the industry.

SEM R2.2.0 – Apr The release cut-off date for the April 2013 release to the Central Market Systems is : Friday, June 22 nd, 2012 All approved Modifications Proposals will be allocated to this release (subject to available capacity).