NOTICE DATE: January 30, 2026

NOTICE TYPE: M-A013026-01 General

SHORT DESCRIPTION: Enhancements to the ERCOT Outage Scheduler in MOTE

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: February 2, 2026

LONG DESCRIPTION: In preparation for the implementation of the following enhancements to the ERCOT Outage Scheduler planned for February 26, 2026, the following enhancements will be available in the ERCOT Market Operations Test Environment (MOTE) for testing beginning February 2, 2026:

• A new warning will be sent when a Resource outage High Sustained Limit (HSL) value exceeds the available Resource Planned Outage Limit (RPOL) (formerly Maximum Daily Resource Planned Outage Capacity (MDRPOC)).
• To allow for a better calculation of available capacity, Resource outage requests with the same megawatt (MW) values will no longer be allowed to overlap. Overlapping derates with different MW values will still be allowed. A new warning will be presented showing the conflicting outage identifiers.
• To better align with Protocol Section 3.1.5.12, the Outage Scheduler will allow requests for a Maintenance Outage Level II to be submitted one day  before the scheduled start of the outage; however, it is within ERCOT's discretion to approve that request for reliability purposes or reject the request and require it be submitted two days before the scheduled start of the outage . All requests for a Maintenance Outage Level III t must be submitted at least three days before the scheduled start of the outage.
• When an outage request is created and the Nature of Work is "Other" or "Unknown," the requestor will receive a message to update the Nature of Work and/or add notes to the Requester Notes section explaining the reason the outage is being taken.
• Before an outage request is considered complete, the Nature of Work must be updated to something besides "Other" or "Unknown," or a note must be included in the Requester Notes section explaining what work was being performed. A new warning message will be sent to remind the requestor to update the Nature of Work or add a note once the outage has ended.
• Currently, only single outage requests can be entered using the Recurring Outage function in the Outage Scheduler User Interface (OSUI) and Application Programming Interface (API). With this enhancement, the ability to enter Recurring Group Outages will be available using the OSUI and API.
• Outages greater than six years past their Planned/Actual End are being purged from the Outage Scheduler database.

ACTION REQUIRED: It is recommended that Market Participants test the ERCOT Outage Scheduler Enhancements in MOTE prior to the enhancements being implemented on February 26, 2026.

ADDITIONAL INFORMATION: A few of these changes were discussed during the January 22, 2026 Technology Working Group meeting (Agenda Item No. 8, Outage Scheduler Enhancements Project-MOTE Testing).

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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