NOTICE DATE:  July 11, 2016
NOTICE TYPE:  W-A070816-03 Settlements
SHORT DESCRIPTION:  EMS Issue Initial Settlement Data
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  July 7, 2016 from 11:42:00 - 13:23:00 CDT
LONG DESCRIPTION:  On July 7, 2016 from 11:42:00 - 13:23:00 CDT, ERCOT experienced an issue with the Energy Management System (EMS).  EMS was unavailable from 11:42 until 12:05 and some components were running in a degraded state from 12:05 until 13:23. EMS has been fully functional since that time. EMS reports and dashboards for 11:42:00 - 13:23:00 CDT on Operating Day (OD) July 7, 2016 should be considered invalid.
ERCOT has corrected prices for Security-Constrained Economic Dispatch (SCED) intervals from 11:42:55 to 13:20:25 for OD July 7, 2016 (i.e., for Real-Time Market 15-minute Settlement Intervals from Interval Ending (IE) 11:45 to IE 13:30). Complete price correction data was posted on ERCOT's Market Information System (MIS) on Friday, July 8.
As a result of the EMS issue, Emergency Base Point data and generation net telemetry data (GSSPLITSCA) are not reliable for settlement purposes. Consequently, in accordance with Protocol Section 10.3.2.1.3, GSSPLITSCA values from IE 11:30 will be used for settlements of IE 11:45 and IE 12:00. Also, Initial Settlement for the EMS issue period will not include payments or charges related to emergency operations settlement for IE 11:45 through IE 13:30.  ERCOT is continuing to evaluate impacts of the EMS issue which may impact subsequent Settlements (i.e., Final Settlement and True-Up Settlement), and will provide updates as necessary.
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]<mailto:[log in to unmask]>.
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