Requirement Development

1. 2011 IDT Release Cut-off R1.10.0 Deploy Requirement Development Detailed Design Factory Test Vendor Coding [30/04/11] URS Sign-Off [29/08/11] Design Issued to MPs [29/07/11] Design Sign-Off Jan 11 Feb 11 Mar 11 Apr 11 May 11 Jun 11 Jul 11 Aug11 Sep 11 Oct 11 Nov 11 Dec 11 2012 System Integration Testing Technical Testing – Environments IDT Deployment SEMO Integration Testing MT Execution MT Preparation Certification UAT (SEMO) TSO/IA (SEMO) TSO/IA (EWIC) Participant Training [06/07/12] Market Trial End [30/04/12] Market Trial Begins [27/01/12] MT Prep Begins Jan 12 Feb 12 Mar 12 Apr 12 May 12 Jun 12 Jul 12 Aug12 Sep 12 Oct 12 Nov 12 Dec 12 [03/01/12] SIT Begins [27/04/12] SIT Complete

2. Key Project Milestones • Vendor Functional Design Approval 29-Jul-2011 • Technical Overview Workshop 03-Aug-2011 • MPUD and Technical documentation issued 29-Aug-2011 • Factory Test Complete 23-Dec-2011 • SIT Execution 03-Jan-2012 – 27-Apr-2012 • Includes: • System Integration Testing • UUC Certification • TSO / IA Testing • UAT • Market Trial Execution 30-Apr-2012 – 06-Jul-2012 • Proposed Deployment* 20-Jul-2012 • Dependencies • Scope: Release Cut-Off Date August 5th, 2011 • Extension to scope may result in changes to design of Interfaces with Participants • Can only be evaluated once changes are approved for inclusion and confirmation is received from the vendors that the required capacity is available. • Intra-Day Trading Mod 18_10: As this develops there is a risk of changes that may impact design. * subject to successful completion of testing

3. Design Deliverables to Participants: • MPUD (re-engineered) • Technical (will advise when the detailed design is finalised) • Market Trial: • Preparation and consultation begins Jan 2012 • Dedicated team • Consultation workshop • Documentation suite • Market Trial will be fully scripted • Execution timeline 30-Apr-2012 – 06-Jul-2012