12/2/22 12:33 PM

M-A120222-01 Planned system maintenance with impacted services

NOTICE DATE: December 02, 2022

NOTICE TYPE: M-A120222-01 Outage - Retail/Wholesale

SHORT DESCRIPTION: Planned system maintenance with impacted services


DAYS AFFECTED: December 7, 2022, 15:30 - 17:00

LONG DESCRIPTION: ERCOT will be performing planned system maintenance of Energy and Market Management systems (EMS, MMS, ITRON) databases on December 7, 2022 during a maintenance window of 15:30 – 17:00.

During the maintenance period on December 7, 2022, Market Participants may experience an outage on the following services between 16:15 and 16:45.

  • MMS – Security-Constrained Economic Dispatch (SCED)/Look Ahead SCED applications may be unavailable for 3 SCED intervals during the 16:15 - 16:45 time frame.
  • Base Points from SCED may not be created for 3 SCED intervals during 16:15 - 16:45  time frame. During this period, Qualified Scheduling Entities (QSEs) with Resources may be required to follow Emergency Base Points from ERCOT Load Frequency Control.
  • Market submissions and requests via Web Services, Market Manager and Outage Scheduler.
  • CDR report publishing and downloading which may cause the following reports to be unavailable:
  • SCED and RTD Reports
  • NSA Active and Inactive Constraint Reports
  • State Estimator Reports
  • Real-Time Dynamic Rating Data Reports
  • Wind Power Production - 5-minute Averaged Actual values
  • Solar Power Production – 5-minute Averaged Actual values
  • The Grid and Market Conditions Dashboards and price displays will not be populated.


Note: Start and completion times of this maintenance may be delayed depending on system conditions at that time. A Hotline call to Market Participants will be executed prior to and following completion of the maintenance.

ADDITIONAL INFORMATION: Market Information System (MIS) and Current Day Reports (CDR) system may be impacted. Reports will be rerun and reposted as applicable.

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

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