NOTICE DATE: October 11, 2023

NOTICE TYPE: W-A092923-02 Operations

SHORT DESCRIPTION: One-Day Reminder of EMS Upgrade Project Closed-Loop Testing

INTENDED AUDIENCE: ERCOT Market Participants

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

LONG DESCRIPTION: As noted in Market Notice W-A092923-01, ERCOT will be performing closed-loop testing of the Energy Management System (EMS) Upgrade Project on Thursday, October 12, 2023. As part of this testing, the ERCOT control room will utilize an upgraded EMS in place of the current EMS in the Production Environment for grid operations. The testing is expected to be conducted over a four-hour period between 10:35 and 14:35 CPT, but may be delayed depending on system conditions at that time.  ERCOT will make a Hotline call to Market Participants before the start and following the completion of testing.

During this testing:

• The current Inter-Control Center Communications Protocol (ICCP) system will be used and will be recycled at the start and completion of the testing. There will be a brief interruption (around 2 - 3 minutes) to ICCP data flow during the cutover to the upgrade EMS and the cutback to the current EMS.
• The current Production EMS will be disconnected from the current ICCP, Market Management System (MMS), Settlements, Market Information System (MIS), and other downstream systems.
• The upgraded EMS will receive telemetry from Market Participants through the current ICCP system.
• The upgraded EMS will monitor and control the grid frequency and provide data to MMS, Settlements , MIS, ERCOT Data Warehouse (EDW), and other downstream systems and applications.
• The upgraded EMS will send Regulation signals, Base Points, Updated Desired Base Points (UDBPs), and Resource-specific Locational Marginal Prices (LMPs) to Market Participants through current ICCP system.
• The Real Time EMS data from this testing will be archived in ERCOT's PI historian.
• The current System Operations Test Environment (SOTE) system will be available for Transmission Service Providers (TSPs) for their STNET studies.  The upgraded SOTE system will not be available for this test.

Impacts during this testing period:

• MMS – Security Constrained Economic Dispatch (SCED)/Look-Ahead SCED applications may be unavailable for three SCED intervals from 10:40 to 10:55 CPT during the transition from the current Production EMS to the upgraded EMS.
• MMS - SCED/Look Ahead SCED applications may be unavailable again for three SCED intervals from 14:40 to14:55 CPT during the transition back to the current Production EMS.
• Base Points from SCED may not be created from 10:40 to 10:55 CPT and from 14:40 to 14:55 CPT. During these periods, Qualified Scheduling Entities (QSEs) with Resources may be required to follow Emergency Base Points from ERCOT Load Frequency Control (LFC).
• SCED Real-Time LMPs may not be calculated and published from 10:40 to 10:55 CPT and from 14:40 to 14:55 CPT.
• DRUC may be delayed during the transition from the upgraded EMS to the current EMS.
• 15-minute Real-Time Settlement Point Prices (RTSPPs) may not be calculated and published during the 10:40 to 10:55 CPT and 14:40 to14:55 CPT time frames. MMS will calculate and publish the RTSPPs for these durations once the testing is completed.
• Dashboards and displays on the ERCOT website will not be populated with data during the transitions.
• The following current day reports containing SCED/Real-Time Dispatch (RTD)/LMP/SPP data may be unavailable during the transitions from 10:40 to 10:55 CPT and from 14:40 to 14:55 CPT:  
• SCED and RTD reports
• Network Security Analysis (NSA) Active and Inactive Constraint reports
• State Estimator reports
• Real-Time Dynamic Rating Data reports
• Wind Power Production -- 5-minute Averaged Actual values
• Solar Power Production – 5-minute Averaged Actual values

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 ClientServices@ercot.com.

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