NOTICE DATE: December 17, 2020

NOTICE TYPE: M-A121720-01 Outage - Retail/Wholesale

SHORT DESCRIPTION: Unplanned system maintenance with impacted services

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: December 18, 2020 9:00 – 14:00 CPT

LONG DESCRIPTION: ERCOT will be performing unplanned system maintenance of several integration applications on December 18, 2020 during a maintenance window of 9:00 - 14:00 CPT. The following systems may have intermittent outages during the maintenance window.

• Market submissions and requests via Web Services, Market Manager and Outage Scheduler.
• Report publishing to the ERCOT Market Information System (MIS)
• Downloading of extracts and reports from MIS and WebServices.
• The following reports may be unavailable:

• SCED and RTD Reports
• NSA Active and Inactive Constraint Reports
• State Estimator Reports
• NSA Active and Inactive Constraint Reports
• Real-Time Dynamic Rating Data Reports
• Wind Power Production - 5-minute Averaged Actual values
• Solar Power Production – 5-minute Averaged Actual values

ADDITIONAL INFORMATION: Note that the Market Information System (MIS) and Current Day Reports (CDR) system may be impacted. Reports will be rerun and reposted as applicable. The MIS Dashboards and ERCOT.com price displays may not be populated with data during this 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 ClientServices@ercot.com.

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