I-SEM Project Managers Group. 21 March 2018

I-SEM Project Managers Group 21 March 2018 1

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 2

Previous Meeting Minutes & Actions I # Action Resolution Status 301 Consider the forum for discussion of Day 2 Issues and add to a future agenda of the PMG 328 Provide additional details on the priority defects classified as participant impacting 329 Investigate and report if it is possible to add an All or nothing functionality in M7 Keep action open until time allows to discuss on PMG agenda. Detailed Defect Report issued and presented at the Market Trial Coordinators Group Meeting 13 April see slides 35-51 of MTCG Presentation. This will be updated and reissued periodically throughout the Trial. It has been confirmed that it is not possible to have All or nothing functionality in M7 and will not be offered for blocks in IDC. Open Closed Closed 3

Previous Meeting Minutes & Actions II # Action Resolution Status 330 Confirm when the registration freeze will end 331 Confirm the rules for starting & resetting the 168 hr clock during scenario 7 332 Organise PMG conference calls midway between each monthly PMG meeting The data freeze period will end on 16 March 2018. This information was previously communicated in the Market Participant Cutover Guide and in the SEMO News section of the SEMO website. V1.0 of the MT 168 Hour Operations Procedure published 12 March 2018. Meetings in I-SEM Calendar; first of these between meetings conference calls took place on 7 March 2018. Closed Closed Closed 334 Collateral Posted for FTRs what happens if there is a delay to I-SEM Go-Live? Measures being taken to mitigate the risk and consider possible back-out contingency measures in the event that the delay to golive is realised (to be discussed at meeting). Closed 4

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 5

I-SEM Project Milestones Status Update

Current Progress on Milestones 5 milestones have been completed since 21 Feb 18 PMG: TSOs #174c Central Systems Ready to Complete Market Trial RAs #139 Publication of I-SEM Charges/Tariffs ICOs #198 FTR Auction Trial, Training & Participant Test period end #197 FTR Auction EWIC & Moyle service active with JAO #199 FTR Auction EWIC & Moyle live on JAO platform 7

Current Progress on Milestones The slides which follow detail: 2 milestones currently reported as being late (red); and 3 milestones currently reported as being at specific risk (amber) In each case, the impacts and mitigating actions are noted All other milestones are currently reported as being on track, noting that all are not without some risk Please refer to the latest I-SEM Status Report for more details, which is published weekly on the SEMO website 8

Slipped Milestones Currently Red (1) #9 BM Engine Certification Complete: As discussed at the 21 Feb. PMG, certification of the BM engine has been extended to 8 May, based upon the current plan for fixing defects in the QBOA software. Achieving this date remains dependent on the timing and quality of software releases, however, we now have increased confidence in this date given (a) the advanced stage of the defect fix work and (b) the recent successful loading & running of QBOA cases in the certification tool. 9

Slipped Milestones Currently Red (2) #109a Effective date of ROI Generator and Supplier Licences: In response to a request by a Licence Holder to the Minister in DCCAE, an Appeals Panel was established on 10 Nov 17. It has a maximum period of six months to reach its decision. 10

At Risk Milestones Currently Amber (1) #87 Market Trial Complete and #250 Go Live: The status of these two dependent Milestones is shown as amber, given the increased levels of risk being carried in the central programme concerning defect fixes; the impact on participants own test plans given the more condensed period of unscripted trialling without material system defects; and other readiness concerns reported by Market Participants via the Market Readiness Assessment, and at the PMG. 11

At Risk Milestones Currently Amber (2) #52 FTR Auction Commences: This milestone has been marked at risk as we await the outcome of the I-SEM Steering Group s decision on approval of the FTR Auction Stage Gate. This decision will be communicated to participants in due course. 12

Forward Look at Upcoming Milestones The following 6 TSO Level 2 Milestones are due to be completed by the end of April 18: #7l I-SEM Technical Specification 8.0 #234b I-SEM Data Publication Guide - Issue 2.0 #215 MRC Approval #119 Finalisation of SEMOpx Procedures #216 Intraday Regional & Member Test complete #217 Day Ahead MRC, Regional & Member Test complete 13

Forward Look at Upcoming Milestones There are no RA Level 2 Milestones due to be completed by the end of April 18: 14

Forward Look at Upcoming Milestones The following ICO Level 2 Milestone is due to be completed by the end of April 18: #52 FTR Auctions commence 15

Change Requests Approved Approved since the last PMG: JCR_360: Modification to TSO Level 2 Milestone: #119 Finalisation of SEMOpx Operating Procedures JCR_361: Introduce a new TSO Level 2 Milestone: #139 Publication of I-SEM Charges/Tariffs 16

Day 2 Requests No Day 2 Requests have been approved since the last PMG, and none are currently in the pipeline for consideration The objective remains only to issue Day 2 Requests were absolutely essential to preserve the I-SEM Project timeline 17

Top Risks I (not in any particular order) Risk Mitigating Controls Trend Legislation/Licensing Delays: Risk that necessary legislation or licensing arrangements are not in place in time for Go-Live RAs on-going liaison with Departments Include relevant market readiness metrics against which to track and report progress Neutral Licence Appeal in Progress; Milestone #109a delayed. 18

Top Risks II Risk Mitigating Controls Trend BREXIT Impact: Risk that Government revisits I-SEM decision, or National Grid/Ofgem choose not to comply with the European Network Codes or not actively support the Target Model cross border arrangements, resulting in changes to scope, project delays, cost overruns, reduced quality, or potentially undermine I-SEM Ensure key decision makers are well informed about the benefits of market coupling Close liaison between RAs and Depts. Development of alternative models considering the impact of Brexit scenarios Neutral With the inaugural T-1 CM Auction run complete and Market Trial underway, the risk of a Brexit impact to golive is likely trending down. However, the risk of a longer-term impact on the I-SEM arrangements post go-live is likely continuing to trend up. 19

Top Risks III Risk Mitigating Controls Trend Central System Testing / Defect Fixing: Risk that completion of Rigorous management processes for tracking Level testing / defect fixing of the vendor deliverables central systems slips, resulting in Strong hands-on those systems not being available management oversight when needed to progress Market Trial. This may result from of vendors, with robust slippages in the delivery and contractual testing of the multitude of systems (e.g. due to vendor nonperformance), arrangements Fill in as many vendor introduction of shortfalls as possible by necessary changes, volume of taking on additional defects or because of the responsibilities/work complexity in bringing together all those systems in the limited time available Plan agreed with ABB for defect fixes required for go-live; two major releases planned for 3 & 22 April. To support delivery to this plan, we have strengthened our vendor on-site presence and will be testing defect fixes on an ongoing basis as they are completed by the vendor. The impact on participants own test plans given the more condensed period of unscripted trialling without material system defects, remains a concern. 20

Top Risks IV Risk Mitigating Controls Trend External Dependencies - Regional Coupling & Cross Zonal Arrangements: Risk that NGET, Ofgem, GB NEMOs &/or ICOs will not deliver key elements/decisions required in a timely fashion resulting in Project delays, cost overruns, or reduced quality. Joint Steering Committee (JSC) (TSOs, NEMOs & ICOs) in place. Joint Implementation Group (JIG) (RAs, TSOs, NEMOs & ICOs) in place. Put in place framework agreements between regional partners. Agree cost sharing arrangements. Down SEM-GB Regional Coupling activities continue to progress well. Going live with a single GB NEMO for the Intraday Auctions was agreed at JSC and JIG meetings in early March. 21

Top Risks V Risk Mitigating Controls Trend Participant Access to Clearing Member Readiness workstream Down Bank: Risk that the clearing model may cause a barrier to entry for market participants, especially smaller participants. has been established which will be an actioned forum where issues can be discussed between NEMO and ECC. The result may be that smaller ECC implementing a direct clearing participants may not be able to solution for market participants. enter the DA and ID markets, with flow on consequences for Participants have managed this risk market readiness. by aggregating through intermediaries In excess of thirty Members registered and the Direct Clearing solution having been established. At Feb PMG one Participant noted they did not have access to a clearing bank. Risk remains open. 22

Top Risks VI Risk Mitigating Controls Trend ABB s nmarket is not available to meet Project Timelines: Risk to progress of Market Trial, given the dependency of a large number of participants on ABB s nmarket Suite, in the event that the vendor s delivery plans slip. For individual participants to determine. Up? To be confirmed by participants. At the Feb meeting, participants noted that this risk is in part being realised, as ABB will not now deliver some of the nmarket functionality after go-live. However, view appeared to be that this would not stop those participants from going live. Current status to be confirmed by nmarket participants at the meeting. 23

Top Risks VII Risk Mitigating Controls Trend Participant Readiness: Risk that Market Participants are not ready Regular market readiness assessment reporting. Regular market participant engagement. Up? To be confirmed by participants Participants have previously advised that this risk was trending up, given compressed timelines to finalise system development and processes, a lack of clarity regarding retail tariffs, and uncertainty on whether participants would be able to make changes to their own systems following updates to the I-SEM Technical Specification and I-SEM Data Publication Guide. Whilst the compressed timeline remains a real challenge for all, there has been progress on these issues. Current status to be confirmed by participants at the meeting. 24

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 25

Readiness Update - Agenda a) Go-Live Stage Gate Update b) ICO Readiness c) Registration d) Technical Documentation e) System Defects f) Participant Readiness g) Regional Coupling h) Cutover 26

Readiness (a) Stage Gate Update I-SEM Readiness Stage Gate Update & Go Live Decision Process ISEM Programme Managers Group 21 st March, 2018 27

FTR Auction Stage Gate - Update The FTR Auction Stage Gate was not approved by I- SEM Steering Group. Energy Trading Arrangements Go Live on May 23 is being reported as at Risk reflecting the increased levels of risk being carried by the central programme mostly surrounding defects. Earliest approval will be in line with the SEMC intention to go-live on April 26. 28

Go Live Decision Process Governance Framework Market Trial Report Participant Assurance TSO/SEMO/MDP/ICO Assurance SEMC 26 th April Confirm Intention to Go Live Complete Market Trial & Readiness Activities Indicative Go Live Decision Timeline Formally Confirm Go Live 8 th May ISEM Steering Group will make recommendation Go Live Decision made by SEMC The SEMC will make an announcement approximately [two weeks] prior to Go Live Cutover Preparation D-8 ETA Go- Live Gate Opening

Readiness (b) ICO Readiness ICOs will provide an update on their current state of readiness and plans for the first FTR auction, in light of the I-SEM Steering Committee Decision of 16 March, not to approve the FTR Auction State Gate. 30

Readiness (c) Registration Balancing Market Highlights Units in Market Trial Units Pending 395 32* *End to end testing completed. Current expected date in Market Trial is by Friday 23/03/2018 *SEMO will advise Participants when they access these units in Market Trial What Who Remark Remaining Forecasts and Revised Forecasts - Complete Initial Credit Cover Calculations Reminder to submit signed Authorised Signatories (B19) to SEMO SEMO Participant Ongoing If not already done so 31

Registration Credit Cover Transitional What Who Deadline (By)Sub Complete and Submit Interim Transfer Facility Participant 28/03/2018 (In cases of Cash Collateral Accounts ) Submit TSC Part C Deed of Charge (In cases of Letters of Credit ) Submit LoC amendment based on TSC Part C template I-SEM only Participant 28/03/2018 Participant 28/03/2018 What Who Deadline (By) Submit Request to Open Cash Collateral Account as soon as possible Participant ASAP (deposit to be made by 09/05/2018) (In case of Cash Collateral) Submit TSC Part B Deed of Charge Participant On set up of Cash Collateral Account Submit Letter of Credit in line with TSC Part B template Participant ASAP 32

Registration - Banking Registration are still in the process of agreeing with the Market Trial team when banking details can be entered in Market Trial. Main changes highlighted in table below: What Who Deadline Transition Banking Details from SEM to I-SEM for existing Participants SEMO TBC* Enter New Participant Banking Details into Balancing Market Interface (BMI) Participants TBC* Confirmation of Banking Details Letters (CBDL) drafted SEMO TBC** Finance review all CBDLs Finance TBC** Issue CBDL to Participants SEMO TBC** Authorised Signatories Sign and Submit CBDL to SEMO Participants 20/04/2018 Check CBDL against Authorised Signatories (B19) and if complete accept Banking Details in BMI *To be agreed with the Market Trial team **To be updated based on sign off of * SEMO 27/04/2018 33

Registration - SEMOpx What REMIT Reporting Agreement Comment Requirements still being finalised with ACER. When S08 is published a communication will be issued to Participants Exchange Member Agreement Registration Change to dates: SEMO will issue the Exchange Member Agreements by 20/03/2018 Participants are asked to return signed, undated by email and post by 16/04/2018 SEMOpx Unit Registration is dependent on Balancing Market registration. There are a number of units pending Balancing Market entry see slide 31. This will be completed in the coming weeks as EPEX require the final Member Referential File by mid April for Type 2 changes and the end of April for Type 3 changes. 34

Registration Capacity Market What REMIT Reporting Agreement Comment Following publication of the C20 REMIT Notification, the System Operators received a number of Requests to Report REMIT Data from Participants. The System Operators shall only process and transmit the REMIT Data to the European Agency for the Cooperation of Energy Regulators on behalf of a Participant for the purposes of compliance with REMIT requirements, as per L.7.1.2 of the CMC. Performance Security The SOs have requested clarification from ACER regarding compliance. Participants that have not achieved Substantial Completion (90% of Awarded New Capacity) by 10/04/2018 shall post Performance Security at the rate of 30,000/MW. Two options: - Letter of Credit as per Appendix H of CMC - Reserve Account 35

Readiness (d) Technical Documentation I-SEM Technical Specification, Release 8.0 (L2-7L) I-SEM Data Publication Guide, Issue 2.0 (L2-234B) Both due to be published 28 Mar 2018 Planned Changes Doc Volume Change ITS ITS DPUG C: Bal Mkt E: Cap Mkt 1. CSB Settlement report schema files (minor edit to relax constraint on order of fields. xs:sequence -> xs:all) 2. CSB Settlement Calendar: update attribute. RUN -> RUN_TYPE 1. Update filename to reflect system-generated file (Part. Auct. Results) 1. Add website report access mechanisms for Type 2, Type 3 2. Add specification for existing ITS Reports REPT_001b (BM-162), REPT_002b (BM-163) 3. Add specification for SEMOpx Intraday Continuous Results reports 36

Readiness (e) Schedule of Priority Defects ABB to EirGrid Release Date Planned 03-Apr Status of Priority Defects for Go-Live Planned 22-Apr Release Pending In EirGrid Test Total (Planned / Pending / In Test) Expected Release Date To Mkt Trial 11-Apr 30-Apr - 19-Mar - # Market Participant Facing Defects 20 9 8 3 40 # Internal Defects 32 16 24 11 83 Total Defects 52 25 32 14 123 Release Pending defects are those for which a release date has not yet been agreed between EirGrid and the vendor discussions are ongoing. ABB has fixed and delivered to EirGrid 143 defect fixes between 01-Jan-18 and 13-Mar-18. 37

Readiness (f) Participants Discussion invited at the meeting on current state of Participant Readiness, and any practical measures which the PMG should consider to help mitigate identified risks or issues impacting on the readiness of participants projects. 38

Readiness (g) Regional Coupling SEM/GB Regional Testing commenced 4 th December Involves functional and procedural testing that is designed to: 1. satisfy the European governing body (MRC) that SEM-GB region can robustly join the European Day-Ahead coupled market and 2. ensure the robustness of the new SEM-GB Intraday market arrangements Testing involves TSOs, SEMOpx, GB NEMOs and Interconnectors Day Ahead functional and procedural testing complete Intraday functional testing due to complete next week; Intraday procedural testing to commence next week All testing remains on track to complete by end April

Readiness (h) Cutover: Participant Guide Cutover Participant Guide (CPG) V1.0 published Feb 16 th Key Activities Identified: Market Trial Scenario 7 Registration Data & Data Freeze Settlement Credit & Clearing Cutover TSC Part A TSC Part B Meter Data Cutover RA approval steps for cutover & go-live Systems cutover arrangements (incl. SEM Systems wind down) Participant cutover activities & timelines Markets cutover timeline for May 22 nd +/- 1 day Internal detailed cutover planning advanced to inform updates to CPG CPG V2.0 published Mar 16 th incorporating updates from feedback received 40

Cutover: Participant Guide CPG V2.0 published Friday March 16 th to address feedback received Feedback received summarily seeking the following: Finalisation of key dates (e.g. gate times, RA decisions) Greater Detail on: Participant Activities Systems Cutover & Access to Production Systems Data cutover arrangements Contingency arrangements Registration Clarifications Market Trial Conclusion Arrangements Fundamental arrangements in CPG V2.0 substantially unchanged 41

Holiday Holiday Holiday GO-LIVE Cutover: Participant Guide Market Trial Phase Month Week Commencing: March-18 12-Mar 19-Mar 26-Mar Unscripted Phase April-18 May-18 02-Apr 09-Apr 16-Apr 23-Apr 30-Apr 07-May 14-May 21-May 28-May 04-Jun June-18 11-Jun 18-Jun 25-Jun Live June-19 03-Jun 10-Jun 17-Jun 24-Jun July-19 01-Jul Market Trial Scenario 7 Key Milestones:Intraday Continuous Market Gate Open Go-Live Key Milestones: Day Ahead Market & Intraday Auctions Gate Open Go-Live Live Operations Key Milestones: Balancing Market Gate Open Go-Live Registration Data Freeze (New Unit Reg. Data) Registration Data Freeze (Changes to Existing Data) SEM Settlement Wind Down Period I-SEM Settlement Taking Place Trading & Settlement Code Part A Validity Trading & Settlement Code Part B Validity * MDPs Input Meter Data into current SEM systems MDPs Input Meter Data into new I-SEM systems SEM Credit Cover Arrangements in Place Credit Cover Transitional Period (between SEM & I-SEM) I-SEM Credit Cover Arrangements in Place Wind Down of Curent SEM Systems Go-Live Decision Confirmed by Regulator *For validity dates of specific sections of TSC Part A, refer to section 2.4.3 RA Decision 42

Cutover - Data Registration Data & Data Freeze Key Dates: Registration Packs submitted for New Units going Effective 01/05/2018* 01/02/2018 VTOD entered in Market Systems for New Units going Effective in SEM and I-SEM on 12/04/2018 01/05/2018 VTOD entered in Market Systems for changes to data for Existing Units going Effective in SEM 19/04/2018 and I-SEM on 08/05/2018 Last available Effective Date for New Units in SEM and I-SEM pre I-SEM go live 01/05/2018 Last available Effective Date for changes to data for Existing Units in SEM and I-SEM pre I- 08/05/2018 SEM go live Date VTOD must be entered in Market Systems for New Units going Effective in I-SEM on 01/06/2018 19/06/2018 First available Effective Date for New Units in I-SEM post I-SEM go live 19/06/2018 *Allowing for the registration process to take up to 60 working days. Registration Packs received after this date will be processed on a best endeavour basis. 43

Cutover Day-Ahead Market DAM Cutover Dates: No. Milestone Trade Date Start Date End Date 1 2 First Day-Ahead Market Gate Open @23:00 for I-SEM Day 1 ( D") First Day-Ahead Market Gate Closure @11:00 for I- SEM Day 1 ("D") 23/05/18 14/05/18 14/05/18 23/05/18 22/05/18 22/05/18 3 Day Ahead Market Go-Live @23:00 23/05/18 22/05/18 22/05/18 Further details added to SEMOpx section of CPG V2.0 in response to queries raised 44

Cutover Intraday Auctions Intraday Auctions Cutover Dates: No. Milestone Trade Date Start Date End Date 1 First Intraday Auction Gate Open @23:00 for IDA1, IDA2 & IDA3 23/05/18 14/05/18 14/05/18 2 First IDA1 Gate Closure @(17:30) 23/05/18 22/05/18 22/05/18 3 Intraday Auction Go-Live @23:00 23/05/18 22/05/18 22/05/18 4 First IDA2 Gate Closed @08:00 23/05/18 23/05/18 23/05/18 5 First IDA3 Gate Closed @14:00 23/05/18 23/05/18 23/05/18 Further details added to SEMOpx section of CPG V2.0 in response to queries raised 45

Cutover Intraday Continuous Intraday Continuous Market Cutover Dates: No. Milestone Trade Date Start Date End Date 1 First IDC Gate Open @11:45 23/05/18 22/05/18 22/05/18 2 First IDC Gate Closure One hour before delivery rolling gate closures every 30 minutes 23/05/18 22/05/18 22/05/18 3 Intraday Market Go-Live @23:00 23/05/18 22/05/18 22/05/18 4 First IDC Nominations sent to SEMO @23:15 and every 15 minutes thereafter 23/05/18 22/05/18 22/05/18 Further details added to SEMOpx section of CPG V2.0 in response to queries raised 46

Cutover Balancing Market Balancing Market Cutover Dates: No. Milestone Start Date End Date 1 First Balancing Market Gate Open @11:00 for I-SEM Day 1 ("D") 14/05/18 14/05/18 2 First Balancing Market Gate Closure @t-1 (22:00) on D 22/05/18 22/05/18 3 Balancing Market Go-Live @23:00 22/05/18 22/05/18 Further details added to Balancing Market section of CPG V2.0 in response to queries raised. 47

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 48

Overall Status Last few weeks on improving ex-ante Market Performance Focus now on: Release Programme to fix defects Improving Settlement experience Improving Contents of Reports Preparation for Scenario 7 Understanding 168 Hour goal 49

Market Trial Scenario 7 168-Hour Operations Trial Procedure Scenario 7 Unscripted - plan to commence March 19 Areas of focus Ex-ante volumes Imbalance price Quality - Market reports and solutions Uptime of Markets Exit criteria successful 168-hour Operations Trial 50

Start 168 Epex & ECC Scenario Holiday Holiday Holiday Holiday Market Trial Scenario 7 168-Hour Operations Trial Trial Phase Month Week Commencing: Trial Week Number: 1 - Connectivity 2 - DAM (EirGrid provide data) 3 - DAM + BM (EirGrid provide data) 4 - DAM + IDA + IDC + BM (Participant data) 5 - DAM + IDA + IDC + BM + Settlement 6 - DAM + IDA + IDC + BM + Settlement (Exceptional Conditions) 7 - DAM + IDA + IDC + BM + Settlement Mocked Data Day-Ahead Auction - Uncoupled Intra Day Auction 3 - Uncoupled Day-Ahead Auction - Coupled Intra Day Auction 1 - Coupled Intra Day Auction 2 - Coupled Inter Day Continious Trading Day-Ahead Market Establishment Phase Scripted Phase Unscripted Phase Live December-17 January-18 February-18 March-18 April-18 May-18 04-Dec 11-Dec 18-Dec 25-Dec 01-Jan 08-Jan 15-Jan 22-Jan 29-Jan 05-Feb 12-Feb 19-Feb 26-Feb 05-Mar 12-Mar 19-Mar 26-Mar 02-Apr 09-Apr 16-Apr 23-Apr 30-Apr 07-May 14-May 21-May 28-May 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 EirGrid Resources Live Operations Intraday Market Balancing Market Settlement Reports - content April 11 - Earliest start date (based on current defect plan) 51

5.3.18 6.3.18 7.3.18 8.3.18 9.3.18 10.3.18 11.3.18 168-hour Operation Trial - Sample Metrics I-SEM Market Trial 168-Hour Operation (Sample daily assessment) ID Market Type Details Target Weekly Tolerance ISEM_5 BM Process Complete and publish 4 LTS Runs per day with feasible output - REPT_001b 28 1 N N N N N N N ISEM_6 BM Process Complete and publish 96 RTC Runs per day with feasible output - REPT_002b 672 4 N N N N N N N ISEM_7 BM Process Complete and publish 288 RTD Runs per day with feasible output - (REPT_003a & REPT_003b) 2016 12 N N N N N N N ISEM_8 Settlement Process Complete and Publish Indicative Settlement (Trading) - REPT043 & REPT044 within 60 minutes 0 N Y Y Y Y Y N ISEM_9 Settlement Process Complete and Publish Indicative Settlement (Capacity) - REPT043 & REPT044 within 60 minutes 0 N Y Y Y Y Y N ISEM_10 Settlement Process Complete and Publish Initial Settlement (Trading) - REPT043 & REPT044 within 60 minutes 0 Y Y Y Y N Y Y ISEM_11 Settlement Process Complete and Publish Initial Settlement (Capacity) - REPT043 & REPT044 within 60 minutes 0 Y Y Y Y N Y Y ISEM_12 Settlement Process Complete and Publish Settlement Document (Fridays only) - REPT045 By 12:00 0 N ISEM_13 Settlement Process Complete and Publish Credit Management Report 1 Once per day 2 N N N N N N N ISEM_14 Settlement Process Complete and Publish Credit Management Report 2 Once per day 0 Y Y Y Y Y Y Y ISEM_15 Settlement Process Complete and Publish Credit Management Report 3 Once per day 2 N N N N N N N ISEM_16 DAM / IDA Availability ETS Type 2 Available for Submissions 95% 0 Y Y Y Y Y Y Y ISEM_17 DAM / IDA Availability ETS Type 3 Available for Submissions 95% 0 Y Y Y Y Y Y Y ISEM_18 BM Availability MPI Type 2 Available for Submissions 95% 0 100 100 100 100 100 100 100 ISEM_19 BM Availability MPI Type 3 Available for Submissions 95% 0 100 100 100 100 100 100 100 ISEM_20 BM Process gate Closure on time 100% +/- 15mins ISEM_21 DAM Process Cross Zonal Capacity Sent to SEMOpx 100% +/- 15mins Y Y Y Y N N/A N/A ISEM_22 DAM Process Gate Closure 100% +/- 15mins Y Y Y Y Y N/A N/A ISEM_23 DAM Process Auction Run 100% +/- 15mins Y Y Y Y N N/A N/A ISEM_24 DAM Process Final Results publication within 60 minutes 0 Y Y Y Y Y N/A N/A Based on last week s metrics restart 168 52

Issues Summary of Key Issues Participants have raised queries regarding the quality of the content of the BM Settlement Statements and Reports Balancing Market System is not sufficiently stable resulting in lack of availability. As a result, there are periods without schedules being developed and imbalance prices being delivered. The issues with QBOA are currently being addressed but until they are resolved, the settlement statements will not be of the required quality. Actions to Address the Issues Release programme presented on March 13 th. Releases currently in test will address defects in Settlement reports _043 and _045 and defects covered by CR15b. Later releases in early April will address a large number of CSB defects. Releases currently in test address up to 6 QBOA defects. Another 7 QBOA defects will be addressed in early April. A large number of Scheduling and Dispatch defects will be addressed in late April. 53

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 54

Summary of Participant Queries February 2018 Number Received Number Resolved on time* Average Resolution Time (Working Days) 358 74% (70%) 3.81 (3.72) * KPI = 20 days query resolution timescale Figures in brackets are last month s numbers for comparison. 55

Summary of Participant Queries February 2018 February showed the same number of queries received over the previous month; there is noted a continued increase in queries related to Market Trial activities (21% growth in comparison to January). The majority of queries received in the month of February were related to Market Trial (68%) and Market Rules (7%). 56

Queries Processed Recent History by Month 400 334 327 Queries processed 358 358 300 200 100 November December January February 57

Agenda 1. Previous Meeting Notes & Actions 2. Project Status & Key Risks 3. Readiness Update 4. Market Trial Update 5. Query Metrics 6. AOB 58

Any Other Business Opportunity to bring forward any other business for discussion. 59

AOB Contingency Planning We d like to have a discussion at the meeting on understanding the challenges to participants in the event that the SEM Committee at its meeting on 26 April 2018 does not signal its intention to go-live, or at some point thereafter having signalled its intention to go-live, there is a need to stop the 23 May go-live process. 60

Close Web: http://www.sem-o.com/isem/pages/home.aspx Email : I-SEMproject@sem-o.com Thank you for your attendance. Next Conference Call: 5 April @10:30am Next Meeting: April 2018 DATE TBC 61