Requirement Development Feb 11Mar 11Apr 11May 11Jun 11Jul 11Aug11Sep 11Oct 11Nov 11Dec 11 [30/04/11] URS Sign-Off [29/07/11] Design Sign-Off 2011 [27/04/12] SIT Complete Jan Feb 12Mar 12Apr 12May 12Jun 12Jul 12Aug12Sep 12Oct 12Nov 12Dec 12Jan 12 Factory TestDetailed Design System Integration Testing MT Execution Vendor Coding [06/07/12] Market Trial End IDT Deployment TSO/IA (SEMO) SEMO Integration Testing Certification UAT (SEMO) Technical Testing – Environments R Deploy TSO/IA (EWIC) [29/08/11] Design Issued to MPs [27/01/12] MT Prep Begins MT Preparation [30/04/12] Market Trial Begins [03/01/12] SIT Begins IDT Release Cut-off Participant Training

Key Project Milestones – Vendor Functional Design Approval29-Jul-2011 – Technical Overview Workshop03-Aug-2011 – MPUD and Technical documentation issued29-Aug-2011 – Factory Test Complete23-Dec-2011 – SIT Execution03-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 5 th, 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

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