UKL Committee - DN Interruption Update 20070208 DN Interruption solution options were presented to the January meeting, and comments have been received SAM solution Shipper interface via IX Data definition in file formats Manual process Shipper interface via e-mail Data definition in templates 10 day comment period following January meeting 5 Shipper responses received 2 expressing preference for manual solution Concerns over complexity & impact on non-participants Evaluate cost benefit of automation once level of take up is known 1 expressing preference for automated solution Requiring 6 months notice of same 1 questioning need for automation for small number of sites 1 supporting development of SPA flows to provide interruptible obligation information through transfer mechanism UKL Committee - DN Interruption Update 20070208

xoserve has considered Shipper comments Detailed responses to comments issued 2nd February Observations made Initially adopt a manual solution (for 2007) Review need for automation in light of participation in and outcomes of first tender - consider costs and benefits to Shippers, Transporters and xoserve Adoption of manual solution does not require Shippers to change systems until some time after results publication (mid July) Awarded Contracts not effective until October 2010, so Shippers can change systems to a timescale of their choosing Changes to SPA flows will impact non-participating Shippers, so consider ‘lower impact’ solution such as changes to IAD screens Proposal to treat as Class 1 Modification Communicate details via operational forums, Gas Forum, etc. UKL Committee - DN Interruption Update 20070208

We are now able to present further detail on the data flows supporting the application process Receive eligible sites information Submit bids for interruptible rights 04 – 15.06.07 Receive details of successful bids Receive statistical summaries Shipper F0S F3 F5 F7 F12 F14 & F15 F16; F17; F18 Identify eligible sites Issue interruption requirement notice Collate and validate submitted bids Notify tender outcomes Notify contract / terms xoserve F0D F1 F8 F14 & F15 Receive statistical summaries Determine interruption requirement Select bids for contracts F2 F9 DN 18.06 – 06.07.07 By 01.05.07 By 13.07.07 UKL Committee - DN Interruption Update 20070208

UKL Committee - DN Interruption Update 20070208 Data definitions are being circulated for representation after today’s meeting Tender Process F0S Pre F1 file for Eligible Supply Point List to Shippers F0D Pre F1 file for Eligible Supply points list to DNs F1 Consolidated Eligible Supply point list F2 Cross Referenced list F3 Publish Interruption Requirement F5 Shipper Bid File F7 Response to Shipper Bid File F8 Bid Notification to DN F9 Contract Notification to xoserve F12 Awarded/Rejected Bids Info to Shippers F14 Summary Report by Location ID F15 Summary Report by LDZ Provision of Contract Information F16 Request Contract Info F17 Contract Details F18 Contract Indicator File UKL Committee - DN Interruption Update 20070208