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NOTICE DATE: June 17, 2019

NOTICE TYPE: M-A061719-01 Operations

SHORT DESCRIPTION: Changes to programmatic access to ERCOT’s External Web Services API and MarkeTrak API

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

DAY AFFECTED: July 17, 2019

LONG DESCRIPTION: On July 17, 2019 at 3:30 PM CDT, ERCOT will implement the following configuration changes to the production External Web Services API (MISAPI.ERCOT.COM and API.WAN.ERCOT.COM) and MarkeTrak API:

These changes are currently configured in ERCOT’s Market Operations Testing Environment (MOTE) and Retail Market Testing Environment (RMTE), including the MarkeTrak API, to allow Market Participants to test their systems prior to them being implemented in ERCOT’s production environment.

ERCOT’s MOTE and RMTE can be accessed through the following URLs.

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

ACTION REQUIRED: Market Participants must ensure that all API communication into ERCOT’s production environment is using TLS 1.0, TLS 1.1, or TLS 1.2 on July 17, 2019 at 3:30 PM CDT.

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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