ERCOT RIWG Meeting Summary
The June 18, 2026, RIWG meeting focused on resource integration process improvements, project readiness requirements, and PSSE v36 model migration. Topics included workflow enhancements, quarterly stability assessment readiness, and dynamic model quality.
1. PSSE v36 Transition – OEM DLL Status and Path Forward
ERCOT provided an update on the transition to PSSE v36 and emphasized that the June 1, 2026 submission deadline for v36-compatible dynamic models has passed. Resource Entities and Interconnecting Entities with outstanding submissions were encouraged to coordinate directly with ERCOT to close remaining gaps.
Key discussion points:
- Generator owners remain dependent on OEMs releasing v36-compatible DLLs before complete model packages can be submitted.
- Tesla, Siemens Gamesa, SMA, Power Electronics, Ingeteam, and EPC have completed their v36 DLL updates.
- Vestas and Sungrow still have outstanding DLL submissions, while GE remains partially complete.
- ERCOT requested that entities use “v36” in RIOO-RS submission subject lines to help prioritize reviews.
- ERCOT will continue coordinating with OEMs and project developers to ensure a smooth transition before future planning studies rely exclusively on v36 models.
2. RIOO INR Workflow Enhancements
ERCOT introduced enhancements allowing users to select operational substations from Resource Services during INR creation beginning July 10, 2026. Existing equipment data will automatically populate, while repowering functionality will be added in October 2026. The update streamlines future modification and repowering activities.
3. Resource Integration Topics
ERCOT reviewed the QSA process and emphasized the importance of meeting all prerequisite milestones to avoid delays in project synchronization. Developers were reminded that all FIS must be completed and posted 45 days before the applicable QSA deadline, along with the submission of dynamic models (PSSE, PSCAD, and TSAT, where applicable) and MQT reports.
ERCOT stressed the importance of completing the FIS and its mandatory 10-day comment period well ahead of the QSA deadline. Waiting until the final submission date can create a surge of study reviews, leaving limited time for ERCOT and TSPs to review comments, resolve deficiencies, and complete the stability assessment within the required timeline. Because of this, TSPs and IEs should plan their studies well in advance to ensure sufficient time for review and resolution of comments. Additionally, the dynamic model review process, including PSCAD model validation and TSAT user-defined models (where applicable), must satisfy Planning Guide Section 6.9 requirements 15 to 30 days before the QSA deadline. Beginning with the August 1, 2026 QSA cycle, submission of the PSCAD Model Quality Test template will also become mandatory.
ERCOT also provided an update on the generation interconnection queue, which currently includes 1,960 active interconnection requests totaling approximately 458 GW, with battery energy storage and solar projects continuing to account for the majority of proposed capacity.
Stay Ahead of ERCOT Interconnection Changes
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