Settlement Stability 2024 Q4 Update to WMS by Magie Shanks

Settlement Stability 2024 Q4 Update to WMS Magie Shanks ERCOT Settlements 02/05/2025

8.2(2)(c)(i) Track number of price changes Reporting Period: 2024 Q4 # of Corrected Prices # of Intervals Affected Operating Day Market Notice ORDC Adders ORDC Adders DASPP MCPC RTSPP RTRMPR RTESOGPR DASPP MCPC RTSPP RTRMPR RTESOGPR 12973 11 24 7 M-B042424-09 01/20/2024 14 14 13 M-B101624-02 08/09/2024 12009 13036 5339 32 33 32 M-B101624-02 08/10/2024 29557 31763 13152 1 1 1 1 M-B101624-03 08/20/2024 927 996 2 411 Notes: The price changes reported on this slide display the price corrections that have been done after the Settlement Statement has posted for the Operating Day. A CRRBA Resettlement was issued due to the DAM Resettlement for Operating Day 01/20/2024. Please refer to Market Notice M-B042424-11 for more information. 2 PUBLIC

8.2(2)(c)(iv) Track number of resettlements due to non-price errors Reporting Period: 2024 Q4 Operating Day(s) Resettled Reason for Resettlement Affected Charge Types Market Notice Number M-D083024-16 M-D083024-17 M-D083024-18 M-D083024-19 M-D083024-20 M-D083024-21 M-D083024-22 M-D083024-23 M-D083024-24 M-D083024-25 An EPS Meter was incorrectly stopped in the Settlement System requiring a resettlement of multiple Operating Days. EMREAMT, ESACAMT, LAEMREAMT, LARTRNAMT, RTEIAMT 12/13/2023 01/02/2024 Due to a DAM Resettlement that included corrections for MCPCs, an RTM Resettlement was required to correct RTM charge types dependent on these values LARTRNAMT, RTEIAMT 01/20/2024 M-B042424-10 3 PUBLIC

8.2(2)(c)(ii) Track number and types of disputes submitted 8.2(2)(c)(iii) Compliance with timeliness of response to disputes YEAR 2024 100% of dispute resolutions were timely. CALENDAR QUARTER REPORTED Q1-Q4 Disputed Charge Sub-Type Submitted Resolved Denied Granted Granted with Exceptions Ancillary Services-RT 11 11 8 3 0 Emergency Operations 2 3 1 2 0 Energy-RTM 44 19 15 4 0 Firm Fuel Supply Service 4 3 0 3 0 Base Pt Deviation 17 15 12 1 2 Reliability Unit Commitment 15 11 0 11 0 TOTAL 93 62 36 24 2 Submitted but not resolved disputes may be: Not started Open Rejected Withdrawn 4 PUBLIC

8.2(2)(c)(v) Other Settlement metrics NOTE: ERS Final settlement OD data is not represented in graph. Average percent change 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 FINAL 3.49 2.56 2.83 3.18 2.99 2.57 3.01 2.93 2.66 3.09 3.53 3.36 2.90 2.34 TRUEUP 0.41 0.39 0.33 0.31 0.25 0.28 0.27 0.26 0.2 0.26 0.46 0.99 0.83 0.38 5 PUBLIC

8.2(2)(c)(v) Other Settlement metrics 6 PUBLIC

8.2(2)(c)(v) Other Settlement metrics 7 PUBLIC

8.2(2)(c)(vi) Availability of ESIID consumption data Load Volume Availability % INITIAL (Jul24-Dec24) FINAL (May24-Oct24) TRUEUP (Jan24-Jun24) 100% Day 1 represents the first operating date of the ranges displayed above 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 97 101 105 109 113 117 121 125 129 133 137 141 145 149 153 157 161 165 169 173 177 181 DAY 8 PUBLIC

8.2(2)(c)(vi) Availability of ESIID consumption data ESI ID Count Availability % INITIAL (Jul24-Dec24) FINAL (May24-Oct24) TRUEUP (Jan24-Jun24) 100% Day 1 represents the first operating date of the ranges displayed 99% 98% 97% 96% 95% 94% 93% 92% 91% 90% 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 97 101 105 109 113 117 121 125 129 133 137 141 145 149 153 157 161 165 169 173 177 181 DAY 9 PUBLIC

8.2(2)(g) Net Allocation to Load - Totals and $/MWh NET ALLOCATION TO LOAD ($M) Dec 2023 Jan 2024 Feb 2024 Mar 2024 Apr 2024 May 2024 Jun 2024 Jul 2024 Aug 2024 Sep 2024 Oct 2024 Nov 2024 Dec 2024 Ancillary Service Settlement 16.9 94.1 10.5 27.5 39.4 146.4 30.1 13.0 36.6 9.6 22.4 15.3 7.9 Balancing Account Payout to Load -19.9 -40.3 -12.1 -21.0 -5.7 -19.0 -29.9 -24.6 -27.6 -16.8 -4.3 -24.5 -13.4 Base Point Deviation Payments -0.5 -0.6 -0.4 -0.9 -1.5 -0.7 -0.6 -0.7 -1.0 -0.5 -0.7 -0.6 -0.7 Black Start Service Settlement 0.6 0.7 0.6 0.7 0.6 0.7 0.6 0.6 0.6 0.6 0.7 0.6 0.7 Block Load Transfer Settlement 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Emergency Energy Charges 0.2 8.1 0.7 0.1 0.2 0.2 0.1 0.1 1.0 0.0 0.0 0.0 0.0 ERCOT Admin Fee Settlement 18.5 24.2 19.4 20.4 21.2 25.3 28.1 28.2 31.1 25.9 24.8 21.3 22.0 ERO Pass-Through Fee 2.1 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 ERS Settlement 8.8 8.8 8.8 8.8 1.7 1.7 7.6 7.6 7.6 7.6 0.0 0.0 0.0 Firm Fuel Service Settlement 7.3 8.0 7.0 3.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 6.7 12.4 High Dispatch Limit Override 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Non-Zonal Auction Distribution -44.2 -37.3 -31.9 -53.4 -61.4 -57.7 -46.5 -30.8 -28.8 -32.5 -48.8 -49.1 -41.3 ORDC Settlement 0.0 1.3 0.2 1.4 1.6 -0.7 0.2 0.1 -0.3 0.4 0.9 0.7 1.5 Revenue Neutrality Total 16.2 10.9 7.9 19.8 13.0 27.1 9.4 9.5 9.8 17.5 9.4 10.5 18.9 RMR Settlement 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 RUC Settlement 0.0 -0.1 -0.1 -0.5 -2.1 -2.1 0.0 0.0 -0.1 -0.1 -0.2 -2.0 -0.1 Voltage Services Settlement 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Zonal Auction Distribution -80.2 -89.1 -91.9 -97.8 -93.0 -100.5 -103.4 -120.5 -119.8 -98.4 -95.6 -84.0 -96.5 Total Allocation to Load -74.2 -9.0 -79.0 -89.0 -83.7 23.0 -102.0 -115.2 -88.6 -84.4 -89.1 -102.8 -86.3 Adjusted Metered Load (TWh) 33.4 38.3 30.8 32.3 33.6 40.1 44.6 44.7 49.4 41.1 39.4 33.8 34.9 $/MWh -2.2 -0.2 -2.6 -2.8 -2.5 0.6 -2.3 -2.6 -1.8 -2.1 -2.3 -3.0 -2.5 Note: The Net Allocation to Load amounts provided in this presentation are for informational purposes only and cannot be relied upon for accurate measurements or forecasts of individual QSE charges and payments. 1The total ERS charges have been evenly allocated across the contract period. 2Zonal Auction Distribution by 2003 Congestion Management Zone, shown below. 3The $/MWh value as calculated per PR 8.2 (2) g 4The $/MWh value by 2003 Congestion Management Zone, as calculated per PR 8.2(2) g 5Allocated to load from two years prior per the Electric Reliability Organization Fee Assessment and Collection Guide 10 PUBLIC

8.2(2)(g) Net Allocation to Load - Totals and $/MWh ZONAL AUCTION DISTRIBUTION PER CONGESTION MANAGEMENT ZONE ($M) Dec 2023 Jan 2024 Feb 2024 Mar 2024 Apr 2024 May 2024 Jun 2024 Jul 2024 Aug 2024 Sep 2024 Oct 2024 Nov 2024 Dec 2024 HOUSTON NORTH SOUTH WEST TOTAL -8.7 -15.2 -26.7 -29.6 -80.2 -8.4 -18.0 -32.5 -30.2 -89.1 -8.0 -17.8 -30.2 -36.0 -91.9 -8.7 -14.0 -33.0 -42.1 -97.8 -8.5 -15.7 -30.2 -38.6 -93.0 -11.0 -17.3 -33.2 -39.1 -100.5 -13.1 -21.0 -35.9 -33.3 -103.4 -12.1 -28.2 -42.4 -37.9 -120.5 -11.9 -29.5 -41.7 -36.7 -119.8 -9.8 -21.4 -33.5 -33.6 -98.4 -9.8 -13.9 -34.3 -37.5 -95.6 -7.7 -13.2 -29.9 -33.2 -84.0 -6.9 -15.8 -29.6 -44.2 -96.5 REAL-TIME ADJUSTED METERED LOAD BY CONGESTION MANAGEMENT ZONE (TWh) Dec 2023 Jan 2024 Feb 2024 Mar 2024 Apr 2024 May 2024 Jun 2024 Jul 2024 Aug 2024 Sep 2024 Oct 2024 Nov 2024 Dec 2024 HOUSTON NORTH SOUTH WEST TOTAL 8.1 10.7 8.5 6.0 33.4 8.6 13.6 9.9 6.2 38.3 7.4 9.8 7.8 5.7 30.8 8.0 9.7 8.5 6.1 32.3 8.5 10.1 9.1 5.9 33.6 10.5 12.1 11.1 6.3 40.1 11.7 14.3 12.0 6.6 44.6 10.5 15.4 11.9 6.9 44.7 12.6 16.8 12.9 7.1 49.4 10.7 12.9 11.0 6.5 41.1 10.2 12.1 10.3 6.8 39.4 8.8 10.0 8.7 6.3 33.8 8.4 11.0 8.7 6.9 34.9 ZONAL AUCTION REVENUE PER CONGESTION MANAGEMENT ZONE ($/MWh) Dec 2023 Jan 2024 Feb 2024 Mar 2024 Apr 2024 May 2024 Jun 2024 Jul 2024 Aug 2024 Sep 2024 Oct 2024 Nov 2024 Dec 2024 HOUSTON NORTH SOUTH WEST TOTAL -1.1 -1.4 -3.1 -4.9 -2.4 -1.0 -1.3 -3.3 -4.9 -2.3 -1.1 -1.8 -3.9 -6.3 -3.0 -1.1 -1.4 -3.9 -6.9 -3.0 -1.0 -1.6 -3.3 -6.5 -2.8 -1.0 -1.4 -3.0 -6.2 -2.5 -1.1 -1.5 -3.0 -5.0 -2.3 -1.2 -1.8 -3.6 -5.5 -2.7 -0.9 -1.8 -3.2 -5.2 -2.4 -0.9 -1.7 -3.0 -5.2 -2.4 -1.0 -1.1 -3.3 -5.5 -2.4 -0.9 -1.3 -3.4 -5.3 -2.5 -0.8 -1.4 -3.4 -6.4 -2.8 NET ALLOCATION TO LOAD PER CONGESTION MANAGEMENT ZONE ($/MWh)4 Dec 2023 Jan 2024 Feb 2024 Mar 2024 Apr 2024 May 2024 Jun 2024 Jul 2024 Aug 2024 Sep 2024 Oct 2024 Nov 2024 Dec 2024 HOUSTON NORTH SOUTH WEST TOTAL -1.4 -1.7 -3.4 -5.2 -2.2 0.8 0.5 -1.5 -3.1 -0.2 -0.9 -1.6 -3.7 -6.1 -2.6 -1.4 -1.7 -4.2 -7.2 -2.8 -1.1 -1.7 -3.4 -6.6 -2.5 1.4 1.0 -0.6 -3.8 0.6 -1.3 -1.7 -3.2 -5.2 -2.3 -1.3 -1.9 -3.7 -5.6 -2.6 -0.5 -1.4 -2.8 -4.8 -1.8 -1.0 -1.8 -3.1 -5.3 -2.1 -1.1 -1.2 -3.4 -5.6 -2.3 -1.8 -2.2 -4.3 -6.2 -3.0 -1.0 -1.6 -3.6 -6.6 -2.5 11 PUBLIC

26.2 Securitization Default Charge 27.3 Securitization Uplift Charge Reference Month (RTM_FINAL data) Subchapter N1 Invoice Month Subchapter M Invoice Month Monthly Uplift ($) (TSDCMA) SDCMMATOT (MWh) Monthly Uplift ($) (MTSUCDA) Non-Optout RTAML (MWh) $/MWh Dec-23 Sep-23 1,897,324 243,257,169 Dec-23 11,120,775 17,167,538 0.65 Jan-24 Oct-23 1,897,324 226,729,946 Jan-24 12,654,675 23,018,229 0.55 Feb-24 Nov-23 1,897,324 221,661,975 Feb-24 11,366,927 17,156,251 0.66 Mar-24 Dec-23 1,897,324 238,659,437 Mar-24 11,366,927 16,786,645 0.68 Apr-24 Jan-24 1,897,324 239,846,950 Apr-24 12,542,816 19,363,302 0.65 May-24 Feb-24 1,926,208 223,533,999 May-24 11,838,559 22,144,086 0.53 Jun-24 Mar-24 1,926,208 239,187,399 Jun-24 10,692,892 22,942,646 0.47 Jul-24 Apr-24 1,926,208 225,048,389 Jul-24 12,602,337 28,238,750 0.45 Aug-24 May-24 1,926,208 241,905,226 Aug-24 11,538,720 28,331,475 0.41 Sep-24 Jun-24 1,926,208 242,555,565 Sep-24 11,923,344 25,122,844 0.47 Oct-24 Jul-24 1,926,208 265,253,998 Oct-24 11,923,344 22,196,978 0.54 Nov-24 Aug-24 2,234,826 261,274,635 Nov-24 10,430,100 17,573,882 0.59 Dec-24 Sep-24 2,234,826 254,909,036 Dec-24 13,134,200 21,313,088 0.62 1The data provided is grouped by the month the amount was invoiced. 12 PUBLIC