NOTICE DATE: September 23, 2025

NOTICE TYPE: M-B092325-01 General

SHORT DESCRIPTION: Posting of Aggregate Operating Reserve Demand Curve (AORDC) for Real-Time Co-optimization plus Batteries (RTC+B) implementation

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: September 23, 2025

LONG DESCRIPTION: The AORDC is used to create the Ancillary Service Demand Curves (ASDCs) which are inputs to the Day-Ahead and Real-Time Markets (DAM and RTM) under RTC+B. With the necessary historical data now available, ERCOT has determined the AORDC for RTC+B, per the method described in Nodal Protocol Section 4.4.12 (note that this Protocol language will remain gray-boxed until implementation of RTC+B). 

The AORDC and associated regression fit parameters have been posted to the ERCOT website under "Key Documents" on the main page for the RTC+B Task Force (link) to provide public access for any interested parties.

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.

If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.

dg