Market Information Provision Initiative (MIPI) Phase 2 Update March 2nd 2009

MIPI Phase 2 – Drivers Primary Driver Operational Stability. Data and functionality migration from the current systems started under the MIPI07 project, and will lead to the decommissioning of the legacy system. Secondary Drivers The project enables National Grid to meet its ongoing licence and UNC obligations: Robust platform for future changes related to the publication of market information and future regulatory requirements in the UK and Europe Enables National Grid to meet Information provision targets/incentives Support for legacy system is due to be withdrawn. MIPI Phase 2 sanctioned on the 26-02-3009 Current system IE3 system Legacy system is IE3

MIPI Phase 2 – Market driven and regulatory information provision initiatives Title Comments UNC Mod 195A National Grid needs to meet obligations under UNC MOD 195A. Some additional data needs to be published. NTS forecast system demand as a percentage of the peak 1 in 20 demand Flexibility data for each Day by Exit Zone NTS Line Pack data Shipper Information System (SIS) Data Publish SIS data items via MIPI instead of SIS UNC Modification Proposal 0219 Publication of UK Wholesale Gas Market Liquidity Data Quarterly DADSEC Auction Report Compile and publish a new report entitled “Day Ahead Daily System Entry Capacity – (DADSEC)”.

MIPI Phase 2 – Key Milestones Project Start – 10/03/08 Project Requirements Complete – 26/02/09 Design Complete – 20/05/09 Phased Implementation -1st Phase iGMS changes 3rd quarter 2009 2nd Phase MIPI changes 4th quarter 2009 Project closure – 31/12/09 Systems affected iGMS – Operational system IE3 - Information Exchange 3 Gemini SC2004 MIS SIS