ERCOT Staff Update: Changes in Controllable Load Resource Participation

ERCOT Staff Update DSWG April 26, 2022

Controllable Load Resource Participation in Non-Spin CLR NPRR and related OBDRR NPRR - Controllable Load Resource Participation in Non-Spin Changes Controllable Load Resource participation in Non-Spin from Off- line to On-Line Non-Spin. Controllable Load Resources will be required to be Security Constrained Economic Dispatch (SCED) qualified and capable of following SCED basepoints. Sets a bid floor of $75 per MWh, equivalent to the offer floor for a Generation Resource providing On-Line Non-Spin. These resources have a standing deployment instruction and therefore the QSE can receive a SCED basepoint at any time their bid is struck. Related OBDRR - ORDC Changes Related to NPRRXXXX, Controllable Load Participation in Non-Spin Removes the CLR providing Non-Spin Schedules and Regulation Schedules from the capacity calculations April 26, 2022 DSWG Meeting 2 PUBLIC

Implementation of NPRR939 Modification to Load Resources Providing RRS to Maintain Minimum PRC on Generators During Scarcity Conditions and NOGR191 NPRR939 Focus is on changes for NCLRs providing RRS Break the RRS from UFR type Load Resources into smaller groups Currently have two groups; will be going to four groups Groups will range in size from 350 MW to 500 MW NOGRR191 4.8.1 Responsive Reserve Service Manual Deployment Allows ERCOT to manually deploy Load Resources other than Controllable Load Resources providing Responsive Reserve (RRS) to maintain a minimum 500 MWs of Physical Responsive Capability (PRC) reserves on Generation Resources to continuously balance the Demand with supply while maintaining the stable grid frequency for smaller disturbances. Note: Scheduled for R3 (5/26/2022 release) April 26, 2022 DSWG Meeting 3 PUBLIC

Interim process for accepting model changes load resources Market notice sent out on Large Flexible Loads participating in ERCOT Review notes and presentations from the LFLTF Workshop on 4/26 Rules are being established to insure studies are being conducted by TDSPs and reviewed by ERCOT Planning and System Operations that meet NERC requirements Requests for Large Load Resource additions to the Network Operations Model are subject to at least a 90 day lead time based on the Protocols Request for smaller new Load Resources are subject to a minimum lead time of at least 45 days prior to the prospective database load date but must have an Interim Update Request Form included with the Service Request Request for Resource Parameters Changes can be submitted for with a short INMU timeline but are going to be subject to availability of personnel to make the changes April 26, 2022 DSWG Meeting 4 PUBLIC

ERS AprMay 2022 procurement summary ERS Time Period ERS10 NWS MW ERS10 WS MW ERS30 NWS MW ERS30 WS MW Total MW 1015.1 1008.4 1022.7 1043.0 1021.6 779.0 799.3 884.4 Clearing Price $/MWh TP Hours TP 1 TP 2 TP 3 TP 4 TP 5 TP 6 TP 7 TP 8 348.6 312.0 309.2 338.8 341.2 300.1 295.1 303.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 664.5 696.3 695.5 679.2 662.4 478.9 484.2 580.6 2.0 0.0 18.0 25.0 18.0 0.0 20.0 0.0 4.54 0.30 0.30 4.44 3.02 0.39 0.37 0.34 168 168 126 126 126 76 114 560 Resource Type Aggregation Type ERS Time Period Generator MW Load MW Individual MW Aggregation MW TP 1 TP 2 TP 3 TP 4 TP 5 TP 6 TP 7 TP 8 285.6 282.4 281.2 282.5 285.6 281.7 279.8 285.6 729.5 725.9 741.5 760.5 736.1 497.3 519.5 598.7 401.4 405.6 409.4 413.2 396.8 279.6 277.2 328.5 613.7 602.8 613.3 629.8 624.9 499.3 522.1 555.9 April 26, 2022 DSWG Meeting 5 PUBLIC

ERS issues related to TNMP 3G Remediation ERS Team sent email to ERS QSEs about issue on April 5, 2022 TNMP has lost communication with 3G IDR meters, changing some sites to Non-IDR meters as a result (including some ERS sites) ERCOT Protocols state that sites lacking 15-minute interval meter data will be treated as missing meter data and deemed unavailable Total share of TNMP sites included in table below, but sites actually affected by the issue expected to be lower: Share of NWS ERS Sites and ERS Megawatts (MW) within TNMP service territory by ERS SCT ERS SCT Share of ERS sites Share of ERS MW Dec 2021 Mar 2022 2.4% 3.3% Apr May 2022 2.2% 5.3% April 26, 2022 DSWG Meeting 6 PUBLIC

ERS issues related to TNMP 3G Remediation ERS QSEs with affected sites may consider: Submitting Substitutions or Supplemental Resources to mitigate the impact any affected sites may have on their ERS Resources. Providing 15-minute interval data directly to ERCOT along with a signed affidavit attesting to the accuracy of the meter data for affected sites (see Section 6.6 through 6.11 of the ERS Technical Requirements & Scope of Work for meter data requirements). Recommend following the TNMP 3G Remediation topic at ERCOT s Retail market Subcommittee (RMS) meetings April 26, 2022 DSWG Meeting 7 PUBLIC