1. *
MARKET SYSTEM RELEASE UPDATE Modifications Committee Meeting 9 August 2011 *
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2. SEM R1.10.0 – Oct. 2011 Scope for SEM R1.10.0 is as follows:
Implementing this change enables:
SEMO to fulfil its obligations under the Code without the need for external contracts;
a rapid turnaround of the MIUN calculation, required under the tight timelines for Intra-Day Trading; and
the commissioning of the new Auction Management Platform (AMP) which will result in the decommissioning of MITs in October 2011.
Deployment Date October 7th, 2011, subject to successful completion of testing.
Change Request
Description
SEM_PC_CR172
MIUN Calculation 2

3. SEM R2.0.0 – Intra-Day Trading - Scope
Scope for SEM R2.0.0 is as follows:
Release cut-off date was Friday, August 5th, 2011
No further changes anticipated. As at the cut-off date there were:
No additional approved Modification Proposals that could be accommodated due to vendor capacity constraints; and
No additional Non T&SC Change Requests submitted to the SDS.
Our vendors have indicated that there is little scope for including additional changes within the Intra-Day Trading release.
Any subsequent approved change will be included within the next release where capacity is available as per the agreed process.
Change Request
Mod Ref
Description
SEM_PC_CR222
18_10
Intra-Day Trading
SEM_PC_CR256
43_10
Variable Price Taker Generator Units and Firm Access 3

4. SEM R2.0.0 – Intra-Day Trading – Project schedule
Key milestones of the project were communicated:
By the SEMO helpdesk to all Participants on July 1st;
At the Market Operator User Group (MOUG) meeting of July 19th; and
At a dedicated meeting for the industry hosted by SEMO on August 3rd.
Major activities and associated schedule for the project are as follows:
* subject to successful completion of testing
Activity
Schedule
Status
Detailed Requirements
Dec 1st , 2010 – Apr 30th, 2011
Complete
Vendor Detailed Design
May 1st, 2011 – Jul 29th, 2011
Design Deliverables Issued to Participants (MPUD etc.)
Aug 29th, 2011
In Progress
Vendor Implementation
Jun 20th, 2011 – Nov 11th, 2011
Factory Testing
Nov14th, Dec 23rd, 2011
System Integration Testing
Jan 3rd, Apr 27th, 2012
Market Trial
Apr 30th, 2012 – Jul 6th, 2012
Deployment
Jul 20th, 2012* 4

5. SEM R2.0.0 – Intra-Day Trading – Current Status
Currently the project is on schedule across all workstreams
A detailed communications plan will be published in the coming weeks to ensure efficient and effective communications for the project duration:
Programme Management Forum (PMF) meetings / conference calls;
Dedicated Design workshops;
Updates to Modifications Committee;
Updates to the Market Operator User Groups (MOUG); and
Regular updates on the SEMO website. 5

6. Friday, November 18th, 2011 SEM R2.1.0 – October 2012
The release cut-off date for the October 2012 release to the Central Market Systems is
Friday, November 18th, 2011
All approved Modifications Proposals will be allocated to this release (subject to available capacity). 6