MISO's Revised Tariff Filing Accepted by FERC

Strategic Insights -

The Federal Energy Regulatory Commission (FERC) has accepted the revised tariff filing of Midcontinent Independent System Operator, Inc. (MISO) on September 30, 2025. The filing, which was submitted on July 31, 2025, aims to reconcile MISO's Open Access Transmission, Energy and Operating Reserve Markets Tariff with previous Commission action. The revised tariff was publicly noticed, and no protests or adverse comments were filed.

Key Takeaways:

  • The revised tariff filing, ER25-3042-000, was submitted by MISO on July 31, 2025, to reconcile its Open Access Transmission, Energy and Operating Reserve Markets Tariff.
  • The filing was publicly noticed, and no protests or adverse comments were filed within the required timeframe.
  • FERC accepted the filing, effective September 30, 2025, pursuant to authority delegated to the Director, Division of Electric Power Regulation - Central under 18 C.F.R. SS 375.307.
  • The revised tariff filing grants notices of intervention, timely-filed motions to intervene, and unopposed motions to intervene out-of-time, as per Rule 214 of the Commission's regulations (18 C.F.R. SS 385.214).
  • The action does not constitute approval of any service, rate, charge, classification, or any rule, regulation, contract, or practice affecting such rate or service provided in the filed document(s).
  • Requests for rehearing by the Commission may be filed within 30 days of the date of issuance of this order, pursuant to 18 C.F.R. SS 385.713.

Statistics:

  • 1 revision was submitted by MISO to reconcile its Open Access Transmission, Energy and Operating Reserve Markets Tariff.
  • 1 document, ER25-3042-000, was filed by MISO under Docket No. ER25-3042-000.
  • FERC accepted the filing, effective September 30, 2025.
  • 30 days is the timeframe for requests for rehearing by the Commission.

Sources:

  • FERC Electric Tariff, 1.E, Definitions - E (92.0.0), SCHEDULE 30, Emergency Demand Response Initiative (40.0.0).
  • 18 C.F.R. SS 375.307, 18 C.F.R. SS 385.214, 18 C.F.R. SS 385.713.