Market Readiness Scorecard Summary Findings Cheryl Moseley Business

Market Readiness Scorecard: Summary Findings Cheryl Moseley Business Rules and Contracts Manager April 6, 2001 1 12/28/2021

Readiness Scorecards • • • Readiness Scorecards are issued on a weekly basis Scorecards issued to MP project managers Scorecard areas for today’s report • Registration & Agreements (All)…………. . • Data Conversion (TDSPs)……………… • Generation Asset Data Forms (Resources)……… • ERCOT-Polled Metering Proposals (TDSPs)……… • NOIE meter point Registration (TDSPs). . …………. • EDI Testing (CRs and TDSPs)…………. . • EDI Systems (TDSPs)………………. • TDSP as LSE issues (IOU – TDSPs)……………… • Private WAN Connection (QSEs and TSPs)………. • Market Operations Interface, API (QSEs). ………… • Market Operations Interface, Portal (QSEs). ……… • Real Time Communications RTU/ICCP…………… 2 12/28/2021

Registration and Agreements 319 Market Participation Applications Received: • 36 QSEs (30 expect to be in pilot) • 102 LSEs (12 REPs expect to be in pilot) • 120 TDSPs • 61 Resource entities 3 12/28/2021

Registration and Agreements Issues • TDSPs – 9 Munis and Coops have not registered • LSEs – 6 of 102 applications pending identification of a QSE • All CRs participating in pilot have QSEs designated • Resources – 7 of 61 applications pending identification of a QSE Action Plan • ERCOT contacting all unregistered Munis and Coops • LSEs and Resources understand the need to identify QSE – under negotiations • Requested PUCT serves approved Protocols to all affected parties 4 12/28/2021

Generation Asset Data Forms 550 Units connected to ERCOT Grid 286 264 Action Items: • ERCOT contacting Resource Entities • ERCOT validating forms received 5 12/28/2021

Metering Design Proposal Status ERCOT’s network model contains 443 active units As of 04 -05 -2001 124 109 86 124 Action Items: • ERCOT contacting TDSPs • ERCOT working with TDSPs to approve pending proposals 6 12/28/2021

NOIE Meter Point Registration Status 110 Munis and Coops Identified As of 04 -05 -2001 NOIE Registration Received 92% Action Items: 101 9 No NOIE Registration 8% • ERCOT contacting missing NOIEs • ERCOT validating forms received 7 12/28/2021

EDI Testing Issues • End to End testing was delayed from 3/26 to 4/2 • ERCOT and MPs are having difficulty completing testing frames within the 3 day turnaround. Currently frames are taking 5 days • NOIE meter data submission test plan completed. Testing for meter data submission will begin on 4/16 Action Plan • TTPT & ITPTA will review timeline and may move to 7 days a week rather than 5 8 12/28/2021

EDI Systems (TDSPs) Issues • TDSPs have informed ERCOT that they would not build systems to interface via EDI for the 95% of non-pilot accounts • TDSPs did not build EDI systems to respond as “old CR” for the 5% Action Plan • ERCOT and TDSPs have agreed upon a workaround • ERCOT has prepared a system change request to be implemented on July 31 st • Workaround will perform data repair on true-up systems and reconcile UFE created from April (end of data conversion) until July 9 12/28/2021

Private WAN Connection Issues • • Frame Relay • QSEs – 16 of 21 QSEs that need frame relay circuits have completed installation and testing • ERCOT completed installation at 3 of the remaining 5. QSEs need to complete construction at their site • The remaining 2 may not need WAN for beginning of pilot • Point to Point • 10 of 24 QSEs that need point to point circuits have completed installation and testing • ERCOT completed installation on 9 of the remaining 14 QSEs • TDSPs – ERCOT completed frame relay circuit installations at all TSPs. 5 TSPs need to complete their site installations for connectivity tests to proceed Action Plan • Client site installation issues have been escalated to project managers 10 12/28/2021

Market Operations Interface (API) Issues: • Connectivity Tests • All 21 QSEs (out of 21 who are qualifying using programmatic interface) have completed XML connectivity tests • Functional Tests • All 21 QSEs have completed XML functional tests • This was a critical mock market entry criteria • Last QSE has passed majority of test • Last phase of functional qualification will continue into the mock market Action Plan • Will monitor performance during the first two weeks of mock market to complete qualification 11 12/28/2021

Market Operations Interface (Portal) Issues: • Functional test on the portal was unable to be performed due to connectivity issues with test environment • 8 QSEs will use portal only during mock market and beginning of pilot (none will represent generation) Action Plan • Functional qualification will be performed in parallel with first two weeks of mock market • ERCOT has made a training environment available for participants 12 12/28/2021

Real Time Communications (ICCP/RTU) Issues: • Technical Testing with QSE systems for RTU and ICCP has started • Resource specific testing will require data submission from all generation units for each QSE • Data from many generation units in network model is missing as QSEs finalize relationships with resource owners who need to submit data forms Action Plan • ERCOT is working with resource owners to expedite submission of data forms 13 12/28/2021

Questions? 14 12/28/2021