NOTICE DATE: December 10, 2021

NOTICE TYPE: M-A121021-01 Outage - Retail/Wholesale

SHORT DESCRIPTION: Planned system maintenance with impacted services


DAYS AFFECTED: December 15, 2021 17:00 – 20:00; December 16, 2021 10:00 – 12:00;

LONG DESCRIPTION: ERCOT will be performing planned system maintenance of several databases on December 15-16, 2021.

During the December 15, 2021 17:00 – 20:00 outage window, all services available through the Market Information System (MIS) will be unavailable, including the following:

During the December 16, 2021 10:00 – 12:00 outage window, Market Participants may experience intermittent issues with the following services:

Note that the outage start times may be delayed depending on the current system conditions.

ADDITIONAL INFORMATION: Reports will be rerun and reposted as applicable. dashboard displays will not be populated with data during the December 15, 2021 17:00 – 20:00 timeframe.

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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