NOTICE DATE: May 21, 2024

NOTICE TYPE: M-A051724-02 Operations

SHORT DESCRIPTION: ERCOT reminds User Security Administrators of action required regarding ERCOT Root Certificate.

INTENDED AUDIENCE: User Security Administrators (USAs)

DAYS AFFECTED: May 21, 2024

LONG DESCRIPTION: As of May 26, 2023, ERCOT worked with the certificate vendor to extend the expiration date of the ERCOT Client Root CAs until May 21, 2034 and the CAs were published to (

ACTION REQUIRED: Market Participants (MPs) must add the new Root Certificate (CA) to all browsers or API keystores no later than May 21, 2024 6:59:59 PM CST to ensure that access to ERCOT's secure websites is not affected.

ADDITIONAL INFORMATION: Please review the ERCOT website for previous Market Notices related to this subject.

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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