NOTICE DATE: September 29, 2023

NOTICE TYPE: W-A092923-01 Operations

SHORT DESCRIPTION: EMS Upgrade Project Closed Loop Testing


DAYS AFFECTED: October 12, 2023, 10:30 – 15:00 CPT

LONG DESCRIPTION: ERCOT will be performing an EMS Upgrade Project Closed Loop Testing on Thursday, October 12, 2023 wherein, ERCOT Control Room will utilize an upgraded Energy Management System (EMS) in place of the existing EMS in the Production Environment for grid operations. Closed Loop Testing will be performed for a 4 hour period between 10:35 and 14:35 CPT.

During the EMS Upgrade Project Closed Loop testing:

Note: The EMS Upgrade Project system switchover activities are scheduled to begin at approximately 10:35 CPT and switchback activities are scheduled at 14:35 CPT; however, the actual start and completion times may be delayed depending on system conditions at that time.  A Hotline call to Market Participants will be executed prior to the start and following the completion of the Closed Loop Testing.

Impacts during Production Closed Loop Testing period:

ACTION REQUIRED: QSEs with Resources may be instructed to follow Emergency Base Points during the transitions of the EMS.

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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