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NOTICE DATE: September 4, 2019

NOTICE TYPE: M-A090419-01 Operations

SHORT DESCRIPTION: Change to programmatic access from ERCOT’s External Web Services API

INTENDED AUDIENCE: Market Participant personnel that administer programmatic communication from ERCOT’s production and testing environments

DAYS AFFECTED: September 5, 2019 and October 8, 2019

LONG DESCRIPTION: On September 5, 2019, ERCOT will implement the following configuration change to the Market Operations Testing Environment (MOTE) for API Listener Notification Messages, to allow Market Participants to test their systems prior to this change being implemented in ERCOT’s production environment.

On October 8, 2019, ERCOT will implement the following configuration change to the production Listener Notification Messages.

Note that inbound (MP to ERCOT) programmatic communication to ERCOT’s External Web Services API already supports TLS 1.2.

There is no impact to Market Participants that access the Market Information System (MIS) or other ERCOT websites through a web browser.

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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