NOTICE DATE: December 18, 2023

NOTICE TYPE: M-A121823-01 Operations

SHORT DESCRIPTION: Implementation of Change in Energy Storage Resource (ESR) Ancillary Service Telemetry

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: February 1, 2024

LONG DESCRIPTION: During the series of workshops that were hosted to discuss changes ERCOT sees necessary to improve monitoring and/or modeling of Energy Storage Resources (ESRs) prior to implementation of Real Time Cooptimization (RTC) and Single model ESRs (“RTC+B”) project. Additionally, a specific change related to how ESRs telemeter Ancillary Service (AS) Resource Responsibilities, AS Schedules and Participation Factors for Regulation Service under the current "combo model" framework was also discussed. In order to reduce some of the challenges associated with working with a "combo" model for ESRs, the following telemetry changes were discussed.

All up AS Responsibilities be carried first on the Generation Resource (ESR-GR) side of the ESR up till its telemetered High Sustained Limit (HSL) and any remaining up AS Responsibility then be carried on the Controllable Load Resource (ESR-CLR) side. Similarly, all the Regulation Down Responsibility be carried first on the ESR-CLR side of the ESR up till its telemetered Max Power Consumption (MPC) and any remaining Regulation Down Responsibility then be carried on the ESR-GR side.
The telemetered conventional Regulation Up and Regulation Down participation factors are expected to be updated based on Regulation deployment amount for both ESR-GR and ESR-CLR so that ERCOT can compute expected Regulation deployment from both sides of the ESR.

Further details on this topic are available in Slide 11 and 32 from June 22, 2023 Workshop; Slides 13-26 from July 19, 2023 Workshop and Slides 18-25 from August 2, 2023 Workshop.

Based on feedback received from Stakeholders during the workshops, ERCOT had issued a Request for Information (RFIs) to all ESR Qualified Scheduling Entities (QSEs). Using the responses received and based on follow up conversations, where needed, ERCOT has determined that impacted ESR QSEs will be able to support the changes described above before February 1, 2024.

Hence, ERCOT will enable logic to consume the updated telemetry related to item #2 above on February 1, 2024 at 10:00. ERCOT will issue a Market Notice after this change has been made.

ACTION REQUIRED: QSEs with ESRs in their fleet should prepare to transition to telemetering AS related data using the updated method described above after ERCOT has enabled the functionality on February 1, 2024.

ADDITIONAL INFORMATION: ERCOT's EMS is backwards compatible. Any QSE with ESRs in their portfolio that is not ready to switch to provide telemetry in the new method will be able to provide as they do today until they are ready to switch to the new method.

CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask].

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