NOTICE DATE: June 10, 2025

NOTICE TYPE: M-B061025-01 General

SHORT DESCRIPTION: ERCOT's Production Notification Listener certificate renewal

INTENDED AUDIENCE: Market Participant personnel that receive notifications from ERCOT's External Web Services on their listeners in the Production environment.

DAYS AFFECTED: June 26, 2025

LONG DESCRIPTION: On June 26, 2025, ERCOT will replace the Notifications Public Key Secure Sockets Layer (SSL) certificate used by the Listeners that receive notifications from the External Web Services (EWS) with a new Notifications Public Key SSL certificate. This applies to the Production environment.

ACTION REQUIRED: Market Participants must download and install the following into their application's key store:

ERCOT Notifications Public Key (valid from 06/06/2025 to 07/08/2026)

All certificates, including the updated public key, are available for download on ERCOT.com at http://www.ercot.com/services/mdt/webservices/.

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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dg