Gas Customer Forum DN Interruption Update - Introduction Mark Freeman 30th November 2007

DN Interruption Update Content Mod 0174 – revised tender timescale Incentives Interaction with NTS Exit Reform Systems Key Dates

DN Interruption Update Mod 0174 Change the tender timeline to extend analysis time Mod Panel recommended implementation 18 Oct 07 Ofgem decision 29 Nov 07 Implementation date 1 Apr 08 (in line with Mod 0090)

DN Interruption Update Mod 0174 timescales Mar Apr May Jun Jul Aug Sep Oct Tender Opens Tender Closes Apply for NTS capacity Site Eligibility Notification NTS capacity results Publish Requirements Notify Results Retain tender timescales – move notification of results to end July

DN Interruption Update Incentives Ofgem GDPCR updated proposals 24th Sep 07 Publish capacity outputs incentive consultation 24th Oct 07 Responses to incentive consultation 9th Nov 07 Publish final proposals and proposed licence conditions Dec 07 Application of Economic Test Ofgem published note on 25th October

DN Interruption Update Interaction with NTS Exit Reform Mod 0116 Ofgem open letter 26th October Following CC decision all Mod 0116 Variants to be reconsidered Ofgem information request to NTS 1st Nov Requesting evidence on anticipated scarcity of flow flex Info reqd by Mid December to inform reconsideration of Mod 0116 Review Group 0166 6 industry meetings so far (Sept – Nov) Present Mod Proposal to Mod Panel Jan 08 Aiming for Mod implementation Apr 08 ?

DN Interruption Update Systems User testing replanned because of additional activities on UK Link Technical Refresh project Tender System Key Dates 11/2/08 User Testing starts 21/3 User Testing finishes 29/3 System Implementation 1/4 First Operational Files run 2/6 Bid Window opens 13/6 Bid Window closes 31/7 Notification of Results

DN Interruption Update Key Dates Further Customer Engagement Dec 07 – Mar 08 UAT Start 11 Feb UAT Finish 21 Mar Feb Mar Apr Site Eligibility Notification 1 Apr May Jun Jul Aug Sep Oct Tender Opens 2 Jun Tender Closes 13 Jun Apply for NTS capacity NTS capacity results Publish Requirements 1 May Notify Results 31 Jul Comments on Interruptible Capacity Methodology close out 20th Dec 07

Gas Customer Forum DN Interruption Update - Introduction Any Further Questions ? Mark.freeman@uk.ngrid.com Mark Freeman 30th November 2007