NOTICE DATE: May 1, 2026
NOTICE TYPE: W-A050225-02 Operations
SHORT DESCRIPTION: Reminder - Requirement to submit dynamic models compatible with PSS/E version 36 prior to June 1, 2026
INTENDED AUDIENCE: ERCOT Resource Entities and Interconnecting Entities
DAYS AFFECTED: June 1, 2026
LONG DESCRIPTION: This is a courtesy reminder of Market Notice W-A050225-01 regarding the requirement for Resource Entities and Interconnecting Entities to submit dynamic models compatible with PSS/E version 36 prior to June 1, 2026.
As previously communicated in the Market Notice W-A050225-01, the transition to PSS/E version 36 will support the development of Dynamics Working Group (DWG) base cases beginning in 2026. Entities with equipment represented using user-defined dynamic models are required to submit updated models to ensure compatibility with version 36.
Resource Entities and Interconnecting Entities that have equipment that is represented with standard PSS/E library models are not expected to need to submit updates for compatibility with PSS/E version 36.
Resource Entities and Interconnecting Entities that have equipment that is represented with user defined dynamic models are required to submit updated models to ensure compatibility with PSS/E version 36.
Resource Entities and Interconnecting Entities shall continue to submit dynamic models compatible with PSS/E version 35 until the transition to PSS/E version 36 is complete. The transition will be considered complete after DWG has approved a set of base cases that are compatible with PSS/E version 36 and the DWG Procedure Manual is updated to identify PSS/E version 36 as the current planning model software.
ACTION REQUIRED: Please submit any necessary dynamic model updates for compatibility with PSS/E version 36 via Resource Integration and Ongoing Operations (RIOO) attachment prior to June 1, 2026. Model quality tests in accordance with Planning Guide Section 6.2(5)(c) should accompany updated models to confirm proper model response. File names should reflect the associated PSS/E version 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 ClientServices@ercot.com.
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