NOTICE DATE: October 24, 2023

NOTICE TYPE: W-A102423-01 Operations

SHORT DESCRIPTION: EMS Upgrade Project Cutover

INTENDED AUDIENCE: ERCOT Market Participants

DAYS AFFECTED: November 2, 2023, 10:30 CDT

LONG DESCRIPTION: ERCOT will be performing an EMS Upgrade Project cutover on Thursday, November 2, 2023 that will replace the current Energy Management System (EMS) with the upgraded EMS in the production environment. The cutover will be performed around 10:35 CDT and all post- cutover activities will be completed by 13:30 CDT. Cutover time may be delayed depending on system conditions at that time. ERCOT will make a Hotline call to Market Participants before the start of the cutover and following its completion.

As part of the cutover, the upgraded System Operations Test Environment (SOTE) system will replace the current SOTE system.

During the cutover to the upgraded EMS:

• The current Inter-Control Center Communications Protocol (ICCP) system will be recycled at the start of the cutover. There will be a brief interruption (around 2 - 3 minutes) to ICCP data flow during this time.
• The current Production EMS will be disconnected from 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 Systems, MIS, Enterprise 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 systems.
• Upgraded EMS real time data will be archived into PI Historian.
• The current SOTE system will be available for Transmission Service Providers (TSPs) for 30 days after cutover to perform their STNET studies for any pre-cutover dates.

Impacts during the cutover:

• MMS – Security Constrained Economic Dispatch (SCED)/Look Ahead SCED applications may be unavailable for 3 SCED intervals from 10:40 to 10:55 CDT during the transition from current EMS to Upgraded EMS.
•  
• Base Points from SCED may not be created from 10:40 to 10:55 CDT. During these periods, Qualified Scheduling Entities (QSEs) with Resources may be required to follow Emergency Base Points from ERCOT Load Frequency Control.
• SCED Real-Time LMPs may not be calculated and published from 10:40 to 10:55 CDT.
• 15-minute Real-Time Settlement Point Prices (RTSPPs) may not be calculated and published during the 10:40 to 10:55 CDT time frame. MMS will calculate and publish the RTSPPs for these durations once cutover is complete.
• Dashboards and displays on the ERCOT website will not be populated with data during the transition.
• 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 CDT:  
• 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 transition to the upgraded EMS system.

ADDITIONAL INFORMATION: Market Participants that experience issues after the upgrade should submit a ticket detailing the issues:  https://www.ercot.com/mp/mpsupt

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.

dg