NOTICE DATE: December 9, 2019

NOTICE TYPE: M-A120519-02 Outage

SHORT DESCRIPTION: Reminder - Planned system maintenance with impacted services

INTENDED AUDIENCE: ERCOT Market Participants

DAYS AFFECTED: December 10, 2019, 15:30 – 17:00 CST

LONG DESCRIPTION: ERCOT will be performing planned system maintenance of Energy and Market Management systems (EMS and MMS) databases on December 10, 2019, during a maintenance window of 15:30 – 17:00 CST.

During the maintenance period, Market Participants will experience an outage on the following services from 16:15 until 16:45 CST.

• MMS – Security-Constrained Economic Dispatch (SCED)/Look Ahead SCED applications may be unavailable for 3 SCED intervals during the 16:15 - 16:45 CST time frame.
• Base Points from SCED may not be created for 3 SCED intervals during 16:15 - 16:45 CST 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.
• Report publishing to the ERCOT Market Information System (MIS).
• Downloading of extracts and reports from MIS and WebServices.
• MIS Dashboards and ERCOT.com price displays will not be populated.

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

Note that the 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: Note that the MIS and Current Day Reports (CDR) system will be impacted. Reports will be rerun and reposted as applicable. MIS Dashboards and ERCOT.com price displays will not be populated with data during this timeframe.

Please review the ERCOT website for previous Market Notices related to this subject.

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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