NOTICE DATE: September 10, 2025

NOTICE TYPE: M-D082925-03 Operations

SHORT DESCRIPTION: Live production two-hour test for RTC+B closed-loop frequency control on September 11, 2025 between 10:00-13:00

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: September 11, 2025 for two hours between 10:00-13:00

LONG DESCRIPTION: This notice is to confirm the live production two-hour closed-loop test of Real-Time Co-optimization Plus Batteries (RTC+B) planned for September 11, 2025 to occur between 10:00-13:00.  

As previously communicated ERCOT has been working with QSEs with Resources to implement and test new telemetry and market submissions into the RTC+B systems.  This production test will be based on QSE RTC+B telemetry, market submissions, and the ability of Resources to follow ERCOT Dispatch Instructions from RTC+B's Security-Constrained Economic Dispatch (SCED) every five minutes and LFC every four seconds to manage the ERCOT dispatch and frequency.

On September 11, 2025, the ERCOT Control Room will issue Hotline calls to coordinate the test and QSEs should be adequately staffed and prepared to support the testing in accordance with the prescribed activities in the RTC+B LFC Handbook in terms of:

• Control room operations;
• Accurate telemetry support, including support of any submissions affecting telemetry (e.g., Current Operating Plans);  
• Resource control for Generation Resources, Load Resources, and Energy Storage Resources; and
• Market submissions in alignment with the prescribed offer requirements in the RTC+B LFC Handbook.

During the duration of the test, data on the dashboards and reports will not be correct because those will reflect the non-RTC system data.

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 ClientServices@ercot.com.

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