NERC EMS Working Group provided updates on dealing with communication failures between control centers.
Highlighted collective efforts, particularly contributions from ERCOT and Sreenivas Badri.
Discussed operational scenarios where system operators and primary EMS servers are in separate control centers, which can lead to issues if communication fails.
Provided three real event cases of communication failures leading to system visibility loss and server conflicts.
The lessons learned from these cases will be published soon, and feedback from members is encouraged to improve system resilience.
Open for any questions and encourages cooperation in developing better practices.
Market trials updates and task force updates will be presented to the group.
Several market trials have begun, with a lot of significant green progress achieved after clearing some policy issues.
Lingering issues include NPRR1282 regarding state of charge duration and NPRR1290 filed 5/28/2025 with regards to a cleanup, although these should not impact market system design.
A frequently asked questions document was established to address inquiries, and more training videos are being added to the RTCBTF homepage.
Sample settlement statements extracts have been posted for testing purposes.
Work on the closed loop frequency control test and transition cutover plan is ongoing.
Weekly phone calls are held for updates and Q&A sessions regarding market trials.
Market trials include QSE connectivity tests, market submission tests, and telemetry setup and checkout.
Scorecards track progress, with dimensions for connectivity, telemetry, and checkout, being updated regularly.
Certain known issues and potential workarounds are highlighted, promising resolution post-migration.
Questions and interactive sessions are encouraged, helping clarify procedures and expectations.
It was confirmed that telemetry during tests does not require accurate live data.
▶️4.2 - Market Trial Testing Status and Telemetry check out process
Sruthi Hariharan covered slides 17 and 18 of the above presentation.
Highlighted frequently asked questions about reports available during market trial.
Market trials will allow participants to view day-ahead reports and obligations during the closed loop phase.
During open loop testing, four specific reports will be published:
SCED Shadow Prices and Binding Transmission Constraints - NP6-86-CD
LMPs by Resource Nodes, Load Zones and Trading Hubs Market Trials - NP6-788-CD
Modify Real-Time ORDC and Reliability Deployment Price Adders and Reserves by SCED Interval - NP6-323-CD
Real-Time Clearing Prices for Capacity by SCED interval – NP6-332-CD
ERCOT will not provide QSE specific settlement statements during market trials but has released generalized sample statements for day-ahead and real-time settlements.
Sample statements and related training videos are available on the May 21 RTC+B task force meeting page.
Updates on reports and settlement statements have been discussed in previous meetings.
Continuous updates to the slide deck will be made for reference material related to market submissions.
Presentation by Tejaswi Potluri on ICCP Handbook updates and changes specific to RTC+B.
Updates to the ICCP handbook, including some changes to RTC+B price adders.
Highlighted necessary changes for the regulation up and down price adders in the ancillary service.
Discussed requirements for the July 7 through August 29 open loop phase of testing.
Discussion on expectations for market participants and ERCOT during this phase, including weekly calls and production quality data requirements, looking over Market Trials Handbook 4.
Prerequisites include ICCP points modeled and checkout completed, and quality data flow demonstration.
Expectations for resource status during test windows, specifically the ability to follow UDSP signals.
Caution about changes needed for receiving and acting on UDSP signals.
Emphasis on key points of the RTC construct being information only, focusing on set point telemetry.
The scorecard process will continue during the testing phase.
Last call for questions, which received no queries.
Reiteration by Sreenivas Badri of importance for QSEs to set up back-end systems for open testing starting in July.
The presentation concluded with a reference to the RTC+B mailbox for further questions.
Preethi Meher from ERCOT's grid and market systems team presented.
The SCR820 RTOC is a web-based tool to enhance real-time coordination between ERCOT and transmission operators, supporting bidirectional messaging and logging interactions.
The tool addresses communication overload during emergencies, reducing reliance on phone calls.
Key project accomplishments:
Built a demo tool, received feedback from TOs, refined project requirements, finalized planning phase.
Target completion and testing timelines:
Internal ERCOT development/testing by January 2026,
TOs/QCs testing from mid-February to mid-April 2026.
Parallel operations in May 2026, full go live by June 2026.
Features include communication views, predefined message templates, and monitoring capabilities for SOL exceedances. Access is controlled with digital certificates with roles like admin, read-only, and operator.
Tool will be accessible via mis.ercot.com application library. Continual updates will be shared in future meetings.
QSEs and TSPs need to prepare for changes and participate in detailed testing plans from February 2026.
The tool supplements the current communication procedures, not replacing existing roles or operations.
▶️8 - NPRR1253 Technical Implementation Review with Example
Presentation of NPRR1253 updates by Subhan Shaik from ERCOT's grid and market applications team.
NPRR1253 involves ERCOT providing system-level ESR charging megawatt and system demand data for market participants' 4-CP load calculations.
Data will be available to participants via ICCP and public API.
ICCP telemetry changes were implemented and went live on March 27, adding a new telemetry point for ESR charging megawatt.
Public API is set to go live today, offering 4-second ESR charging megawatt and system demand values every 5 minutes.
Market participants need to send requests to ERCOT's API to access data; JSON payload metadata specifications discussed.
Two sources of data, ICCP and public API, provide 4-second instantaneous megawatt values, with 15-minute averages needing to be calculated by participants.
MIS WSL report publishes 15-minute intervals of wholesale storage load megawatt-hours, often closely matching calculated values.
Public API provides system demand and ESR charging megawatt samples every 4 seconds, available every 5 minutes with a 20-second offset.
Recommendation to use ICCP or public API for accurate 4-CP load calculations due to synchronization of data sources and timestamps.
Public API goes live today, with full dataset availability from midnight tomorrow.
No initial questions or comments from participants, moving directly into topics.
Discussion on the recent implementation impact on ERCOT and implications for RTC+B beginning preparations.
Emphasized importance of 4-CP intervals during summer months (June-September).
Market participants showed interest in ERCOT's load charging doctrines and their impacts.
Reports indicate changes to 4-CP intervals compared to market participants' expectations last summer.
Clarification on the calculation of coincident peaks within settlement intervals, changes include additions and subtractions concerning energy transfers and wholesale loads.
Post-RTC+B changes will involve settlement only energy storage systems and redefine wholesale load storage.
No additional comments or questions from participants on this topic.
Potential updates on 4-CP topics to ensure market readiness and proactive data dissemination.
Plans to discuss details further and provide more information in future meetings.
Future topics include updates on RTC+B moving into open loop testing and development of DPC automation tool requirements.
Discussion on wrapping up DPC automation tool requirements and feedback submission from TOS for upcoming TWG meeting.
Acknowledgment for meeting facilitation and participation.
