ERCOT IBRWG Meeting Summary June 15, 2026
The June 15, 2026, ERCOT Inverter-Based Resource Working Group (IBRWG) meeting covered four key topics: the PSSE v36 transition and OEM model readiness, industry and interconnection study updates from ESIG, ongoing NERC reliability standards development affecting IBRs, and ERCOT’s NPRR1333 initiative to incentivize Advanced Grid Support capabilities. Collectively, these efforts reflect ERCOT’s continued focus on maintaining reliability in an increasingly inverter-dominated grid.
1. PSSE v36 Transition
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. ERCOT IBRWG Industry Updates
ERCOT provided a broad industry update covering emerging reliability requirements, interconnection initiatives, and training opportunities.
Highlights included:
- France and Mexico have recently adopted Grid-Forming (GFM) requirements for certain battery energy storage projects, reflecting a global trend toward advanced inverter capabilities.
- ESIG and the U.S. Department of Energy continue to advance the i2X STITCH initiative, which focuses on harmonizing interconnection study practices across U.S. regions and improving study efficiency, transparency, and consistency.
- The i2X FIRST initiative continues to focus on implementation of new reliability standards affecting inverter-based resources, including PRC-029 and future EMT-related requirements.
- ESIG announced several technical workshops and training programs focused on interconnection studies, EMT analysis, large-load modeling, and advanced inverter-based resource studies.
3. June 2026 NERC Update
NERC provided updates on multiple-standard-development efforts associated with FERC Order 901 and inverter-based resources.
Major updates included:
- Milestone 2 (approved except for FERC directives by a new standard project) ride-through revisions remain active, including Project 2025-05 (PRC-029-2), which narrowly missed passing ballot approval and is targeting a final filing by August 2026.
- Milestone 3 (approved in February 2026) projects continue advancing, including MOD-026-2, MOD-033-3, MOD-032-2, TOP-003-8, and IRO-010-6.
- Milestone 4 (drafting underway) Project 2025-04 (Order 901 Planning Studies) achieved passing votes, while Project 2025-03 (Order 901 Operational Studies) did not achieve sufficient approval.
- NERC’s EMT Modeling Project (2022-04) continues to receive significant industry engagement, with more than 170 participants and extensive industry comments under review.
- EOP-004 IBR Event Reporting revisions were approved and are moving toward NERC Board approval.
- NERC finalized its Category 2 Generator Owner/Generator Operator registration initiative, resulting in approximately 800 newly registered entities across North America, including numerous facilities within Texas.
4. NPRR1333 – Advanced Grid Support Incentive Program
ERCOT reviewed NPRR1333, which proposes a one-time Advanced Grid Support (AGS) incentive program intended to accelerate adoption of advanced inverter capabilities by existing inverter-based resources that are not otherwise required to provide those services.
Key discussion points:
- The proposal establishes a voluntary incentive mechanism to encourage eligible inverter-based resources to implement advanced grid support capabilities within a specified timeframe after award notification.
- The initiative builds upon recent grid-forming and advanced-grid-support requirements established through NOGRR272.
- The objective is to improve system strength, stability, and reliability as ERCOT continues transitioning toward a grid with higher inverter penetration.
- Discussions included program structure, eligibility criteria, incentive rates, and performance obligations associated with participation.
Stay Ahead of ERCOT Requirements
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