NOTICE DATE: August 20, 2025

NOTICE TYPE: M-A082025-01 General

SHORT DESCRIPTION: ERCOT Digital Certificates transition to new Root CA.

INTENDED AUDIENCE: User Security Administrators (USAs)

DAYS AFFECTED: October 1, 2025

LONG DESCRIPTION: On October 1st, 2025, ERCOT will start generating Digital Certificates based on a new Root CA.  

Any valid Digital Certificates (based on the present Root CA) will still be accepted by ERCOT MIS and API.  As certificates expire are renewed or reissued, the new Root CA will be required.

ERCOT does not anticipate any interruptions or changes to the current process as we migrate to the new Root CA.

In the case of machine-to-machine communication, there should not be any differences from our current setup.

ADDITIONAL INFORMATION: Root CA installation and location information to be provided in a subsequent Market Notice.

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