IBR Standards Under FERC Order 901

FERC issued Order No. 901 in October 2023, directing the North American Electric Reliability Corporation (NERC) to develop new and revised Reliability Standards to address reliability risks associated with inverter-based resources (IBRs). NERC organized this work into four milestones spanning 2024 through 2026, beginning with a comprehensive work plan—Milestone One—with quarterly updates on progress.

Milestone Two focused on IBR performance and disturbance monitoring, and generated new Standards PRC-028, PRC-029, and PRC-030. These Standards were filed in November 2024 and all were approved by July 2025. FERC directed NERC to further address exemptions for high-voltage direct current (HVDC) connected IBRs and long lead time projects through additional Standards work. NERC worked with stakeholders to revise the Standards for these concerns and created Project 2025-05. The Standards Drafting Team formed in late 2025 aims to post an update for public comment in mid-March 2026.

Milestone 3 addresses data sharing, model verification, and model validation. NERC filed revisions to MOD-026-2, MOD-032-2, MOD-033-3, IRO-010-6, and TOP-003-8 in November 2025, and FERC approved the full Milestone 3 package on February 19, 2026.

Work on Milestone 4, covering planning and operational studies (revising TPL-001 and TOP-003), is underway. Webinars were held in February to gain industry input (posted recordings are on NERCs website). An in-person and virtual workshop planned for this May will support the goal of filing with FERC by November 4, 2026.