UK Link Technology Refresh Annie Griffith February 2008

Progress Since Last Update Early interface routing changes implemented successfully Completion of 3rd party security penetration testing at new Data Centres Dress Rehearsal completed 4th trial migration + batch catch-up Bulk Migration started SAM completed, incremental updates being applied INV in progress File system migration – in progress

Cut-over and Implementation Outage still planned at 4 days, 23rd-26th February All Go/No-go points defined Back-out points and processes defined Error scenarios worked through and recovery actions understood MOD proposal 184 approved at Mod Panel on 7th Feb, awaiting Ofgem decision, includes: 2 partial non-business days for section G, M and S4 (25th & 26th Feb) 4 days relief from data logger liabilities (24th-27th Feb)

Cutover Approach Data cutover Started on 1st Feb, 3 weeks in advance of main cutover, with BULK migration, followed by “delta” data updates This will have no effect upon the operational service Final cutover starts 22nd/23rd February 2008 REC invoice to be issued early on Friday 22nd – due dates will be unchanged Other production runs on 22nd will be unchanged Outage start time Starts after Datalogger file issue on Saturday 23rd Shippers should continue to send files as usual

System Impacts System Sat 23rd Feb Sun 24th Feb Mon 25th Feb Tue 26th Feb Wed 27th Feb Thu 28th Feb Conquest Outage Service resumes, data will match UK Link Normal service IAD Will have data as 22nd Data will be up to date (27th) SP Transfer No Run Run 24th and 25th Run 26th and 27th Normal Service Data Loggers 23rd Run Run 24th and 25th

Decision Points Summary ID Date Input Output G1 11th Jan Interface Plans Agreed Move to early interface implementation G2 22nd Jan UAT and OAT Completed Initiate Bulk Data Migration G3 01ST Feb Dress Rehearsal completed, All plans in place Start pre-cutover activities G4 21st Feb All approvals in place Approval to start G5 23rd Feb Data loggers Complete Start Outage G6 24th Feb 12:30 Migrations Completed Desk top rollout and reconciliation checks G7 25th Feb 10:00 Data Rec. Completed Release to internal users for screen verification G8 25th Feb 19:30 On Line Verification complete Start batch catch up G9 26th Feb 09:00 Transfer Routes and data validated Release to internal other systems G10 26th Feb 10:00 Files generated and verified Release to Shippers G11 26th Feb 12:00 Batch catch-up progress OK Enable peripheral applications

Implementation Communications Specific updates around the implementation will be emailed to the standard distribution lists UKLC Operational Shipper Contacts Planned Comms w/c 18th Feb – Outage reminder notices issued Monday 25th – notice on progress over weekend Tuesday 26th – notice on catch-up progress Wednesday 27th – further notice on catch-up (if reqd.) In case back-out required Will send out notice over weekend or at earliest opportunity

Next Steps Final pre Go-live Shipper communications Complete Bulk migration activities and other pre-implementation work Go-live Cutover