Understanding MOD-026-2: Expanded Modeling Obligations and Compliance Timeline

Effective April 1, 2026, NERC MOD-026-2 is a new reliability standard that significantly expands upon the retired MOD-026-1 and MOD-027-1 standards. MOD-026-1 and MOD-027-1 historically covered dynamic model validation requirements for positive sequence models (PSSE/PSLF/TSAT).  

Driven by FERC Order No. 901, MOD-026-2 mandates that IBR Owners submit both positive-sequence and electromagnetic transient (EMT) dynamic models — verified and validated against actual field measurements or staged tests. 

How Will MOD-026-2 Affect IBR Owners? 

• New: EMT Model Required: IBR owners must now submit a verified and validated EMT model (e.g, PSCAD) in addition to the positive-sequence model. 
• New: Large-Signal Benchmarking: Models across different platforms (e.g, PSCAD and PSSE) must be benchmarked using large-signal disturbance tests. 
• Mandatory Field Testing: Model validation must compare simulated vs. measured responses from staged tests or system disturbances — covering both active power/frequency and reactive power/voltage excursions. 
• 10-Year Validation Cycle: Models must be fully reverified and revalidated at least every 10 years, and within 180 days of any hardware, firmware, or control-mode change that alters dynamic response characteristics. 

Why Partner with EPE? 

• End-to-End Service: From test plan to final compliance report — one team, one contract, no coordination gaps. 
• PSS/E, PSLF, TSAT & PSCAD Experts: Expertise in all simulation platforms used by regional Transmission Planners and Planning Coordinators. 
• OEM Coordination: EPE’s team of experts works directly with turbine and inverter OEMs to obtain and validate proprietary PSCAD models. 
• Compliance Calendar Management: Our team tracks your R2, R3, and R4 milestones — so you never miss a model submission deadline. 

To find out how EPE’s team of compliance experts can help you meet the new MOD-026-2 standards efficiently and strengthen reliability in the process, contact us today using the form below.