NOTICE DATE:  August 27, 2015

NOTICE TYPE:  M-A082715-01 General

SHORT DESCRIPTION:  Action Required: ERCOT External Web Services Secure Sockets Layer certificate update

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  September 2, 2015 from 11:25 a.m. – 11:30 a.m. CPT

LONG DESCRIPTION:  On September 2, 2015, between 11:25 a.m. and 11:30 a.m. CPT, ERCOT will update the expiring Secure Sockets Layer (SSL) certificate required for programmatic access to ERCOT’s External Web Services (EWS) Application Programmatic Interface (API) (

ACTION REQUIRED:  Prior to 11:25 a.m. on September 2, 2015, all Market Participants that communicate with the ERCOT EWS API ( must install the updated public key into their application’s key store to be able to send validated SSL submissions after ERCOT’s update of the SSL certificate.  Failure to install the updated public key prior to ERCOT’s update of the SSL certificate will prevent Market Participants from being able to make successful programmatic submissions and queries to ERCOT’s market systems.

In order to avoid communication interruptions during the transition, Market Participants must install the updated public key, in addition to the current public key, into their application’s key store prior to ERCOT’s update of its SSL certificate.  

ADDITIONAL INFORMATION:  The updated public key is identified as ERCOT Public Key (valid from 08/17/2015 to 08/18/2016) and is available for download at the following link:

Additional information can be found in the ERCOT SSL Communications Standards. 

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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