NOTICE DATE:  December 9, 2016

NOTICE TYPE:  W-A120916-01 Outage - Wholesale

SHORT DESCRIPTION:  Planned system maintenance with impacted services

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  December 13, 2016, 15:30 – 17:00 CPT

LONG DESCRIPTION: ERCOT will be performing planned system maintenance of Energy (EMS) and Market Management (MMS) systems source databases on December 13, 2016, during a maintenance window of 15:30 – 17:00 CPT.

During the maintenance period, market participants will experience an outage on the following services during the 16:15 - 16:45 CPT time frame.

· MMS – Security-Constrained Economic Dispatch (SCED)/Look Ahead SCED applications may be unavailable for 3 SCED intervals during the 16:15 - 16:45 CPT time frame.

· Base Points from SCED may not be created for 3 SCED intervals during the 16:15 - 16:45 CPT 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)

· The 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

ADDITIONAL INFORMATION:  Note that the MIS and Current Day Reports (CDR) system will be impacted. Reports will be rerun and reposted as applicable. The MIS Dashboards and ERCOT.com price displays will 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 [log in to unmask].

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