Cutover & Implementation Aggregated Programme RAG UK Link Programme Dashboard Report Change Overview Board – 3rd November 2014 Executive summary RAG status for the Programme remains at ‘amber’. File formats issued to plan, with reps closed for phase 1 and 2 file formats. Walkthrough day planned for 28th October and extraordinary UK Link Committee planned for 30th October Functional fit currently remains positive at approximately c.80%. *Detailed design activities completed with the exception of non core SAP (ie customisation items) which will complete in November Walkthroughs of “to be” business processes continues to agreed plan Shipper File format reviews continue to plan with all format changes being published and reps closing for phases 1 & 2. Industry walkthroughs of “to be” business processes continues to plan and on schedule to complete in December The release plan for non-shipper file formats has been developed; industry engagement approaches are being agreed. Two Transition mods (mod 514 and 515) have been raised and are being progressed through their respective working groups. Two further mods are being progressed through the required governance in order to raise to the Industry. Build activities continue to plan System testing activities continue Preparation work for System Integration Testing has commenced Recent Achievements Progress and close out the File Format consultation process through the UK Link Committee. Continue to progress build and System Test activities Ensure that suitable progress is made in data cleanse activities through the Data Cleanse Forum. Continue to progress the ‘To Be Process Walkthrough’s; the current schedule will conclude as planned in December Continue to work through the Market Trials approach, scheduled for Industry communication during Q1 2015. Continue to progress the formal raising of Transition mods through PNUNC. Finalise the approach and plan for Non-Shipper file format release. Commence preparation for User Acceptance Testing Future Priorities 2014 Q1 2014 Q2 2014 Q3 2014 Q4 2015 Q1 2015 Q2 2015 Q3 2015 Q4 Industry Engagement Comms Reporting Date GO LIVE IE Comms. To-Be Processes IDR Updates 12/5 Test Strategy 18/6 Transition Strategy 02/10 Shipper Egt Day Q1 2015 Mkt Trials Approach 31/3 Transition Mods Approved 31/3 Imp. Dates Outage Window 01/6 Start of Market Trials, L/L Cutover Plan 30/9 File Format Release 30/11 Industry Go, No Go Straw Man 28/8 End of Market Trials 13/11 Targeted FF Approval Programme Milestones Key Milestone High Level Design Complete Detailed Design Xoserve UAT Industry Testing Start Cutover & Implementation Baseline Date 18/04/14 26/09/2014 28/05/15 01/06/15 01/10/15 Current Planned Date 30/04/14 24/10/2014* 28/06/15 01/10/2015 Aggregated Programme RAG Risks Key Dependencies Risk Summary Impact Date Mitigation Industry readiness: Risk that there is a varied understanding within stakeholder organisations of Nexus requirements due to lack of or inconsistent attendance at industry forums. June 2015 Xoserve’s programme of industry engagement at all levels aims to level-set understanding. Terms of Reference in UKLIEF will avoid re-working topics agreed through PNUNC. File Formats: There is a risk that any changes to file formats as a result of the UKLC approval process (formal consultation and reps) may impact on the ability of the industry to deliver by Oct 2015 due to design re-work Nov 2014 Draft file formats released in August to give early sight and UKLP Engagement Day set up to focus on file formats in the context of business processes. Market Testing: Risk that Market Trials is insufficient in length, too late within the programme, and participants may not be ready in time to take part. Xoserve are investigating the feasibility of de-coupling Market Connectivity Testing and Market Trials. Dependency Date Required Impact if missed Status Industry participants to cleanse Settlement data by December 2014 Dec 2014 Output from the Testing phase may produce unexpected results due to uncleansed data. Industry (Shipper) agreement on Shipper file formats through UKLC Nov The programme will continue build and testing activities at risk. Industry Stakeholders to complete their internal system builds Jun Industry may not be able to fully participate in the Market Trials phase

UK Link Programme Dashboard Report (II) CMS Consequential Change Recent Achievements: Consequential impacts to the CMS system have now been ascertained and the review and approval of the HLD is underway Priorities For Next Month: Review and approval of the CMS Consequential Changes and completion of the HLD phase Risks: Changes in the UK Link design during later stages of the project may impact the CMS functionality. Dependencies: Delivery of target UK Link environments to allow CMS changes to run in parallel. Key Milestone HLD Complete Detailed Design Xoserve UAT Industry Test Start Cutover & Implementation Baseline Date 21/10/14 20/11/14 29/05/15 01/06/15 01/10/15 Current Planned Date 17/11/14 12/12/14 03/07/15 13/07/15 Aggregated RAG SAP BW (IP/DE) Recent Achievements: Analysis on existing DE Service progressing Development of Functional and Technical Specifications NB: Detailed Design Complete date now reflects DE Service, previous reports did not. Priorities For Next Month: Progress development of Functional and Technical Specifications for Reports Continue Analysis of current DE Service and clarification of delivery on SAP technology. Risks: There is a risk that UK Link detailed design is not completed on time and leads to delays in finalising the design of SAP BW. Dependencies: Completion of UK Link detailed design to baseline the final requirements for the SAP BW solution Key Milestone Req’s Validation Detailed Design Complete Xoserve UAT Industry Test Start Cutover & Implementation Baseline Date 30/05/14 16/10/14 29/05/15 01/06/15 01/10/15 Current Planned Date 29/12/2014 30/06/15 Aggregated RAG Gemini Consequential Change Recent Achievements: Build progressing to plan System Test planning complete Priorities For Next Month: Commence System Testing Detailed test planning in conjunction with EU Reform Risks: Risk that the UKL DD phase will define further interface requirements impacting Gemini Dependencies: Additional full scale environment required to meet test requirements Key Milestone HLD Complete Detailed Design Xoserve UAT Industry Test Start Cutover & Implementation Baseline Date 11/07/2014 12/09/14 29/05/15 01/06/15 01/10/15 Current Planned Date 30/09/14 Aggregated RAG

Change Portfolio: Programme Dashboards Recent Achievements: Build phase and upgrade of test environments is progressing to plan. Detailed test planning is continuing. Greater understanding is developing of the dependencies between UKLP and EU Reform and development of options to mitigate the delivery risks. Priorities For Next Month: Continue with Application Build. Continue with the upgrade of test environments to accommodate EU Changes. Risks: A solution is required to enable data exchange between Adjacent Transmission System Operators and Gemini, given that TSOs are not using the assumed mechanism. A B2B solution is under selection following analysis of options. High risk of change due to unapproved EU Codes and UNC mods. Dependencies: Baselining and approval of modifications is required. EU Reform – EU Phase 2 and Gas Day Changes Key Milestone Analysis Complete Detailed Design Xoserve UAT Cutover & Imp. Baseline Date 30/06/14 15/08/14 31/07/15 06/09/15 Current Planned Date 06/09/15* Aggregated Programme RAG *Cutover to be planned alongside UKLP Smart Portfolio – DCC Day 1 & DCC Gateway Recent Achievements: Detailed design completed early on 21/10/14 The Build phase for delivery of the DCC Gateway mechanism continues despite uncertainty over potential DCC delays Priorities For Next Month: Order the connection to the DCC Continue with build activities Continue to liaise with the DCC to determine the impact of potential SIT delays Risks: Uncertainty over revised DCC go-live Late delays to UKLP or DCC implementation would impact DCC Gateway cutover Dependencies: DCC Gateway deployment approach remains dependent upon the sequencing of DCC and UKLP go live dates. Key Milestone DCC Day 1 Impl. HLD Complete Detailed Design Xoserve OAT Cutover & Imp. Baseline Date 29/06/14 n/a 05/09/14 24/10/14 13/12/14 Current Planned Date 23/10/14 31/12/14 18/01/15 Aggregated Programme RAG Faster Switching (Mod 477) Recent Achievements: Completion of UAT on schedule and moving into the Implementation Dress Rehearsal Phase. Priorities For Next Month: Dress Rehearsal of Implementation activities Implementation of functional changes to the legacy UK Link system Risks: None Dependencies: Key Milestone Analysis Complete Detailed Design Xoserve UAT Cutover & Imp. Baseline Date 07/04/2014 30/05/14 17/10/14 07/11/14 Current Planned Date Aggregated Programme RAG