Federal Energy Regulatory Commission Issues Delegated Order to Midcontinent Independent System Operator, Inc.

Strategic Insights -

On July 15, 2025, the Federal Energy Regulatory Commission (FERC) issued a delegated order to Midcontinent Independent System Operator, Inc. (MISO) related to the company's Open Access Transmission, Energy, and Operating Reserve Markets Tariff. The order accepted MISO's submission of revisions to certain provisions of the tariff, which were made in response to a previous FERC order issued on October 17, 2024.

Key Takeaways:

  • The FERC issued a delegated order to MISO on July 15, 2025, accepting the company's submission of revisions to its Open Access Transmission, Energy, and Operating Reserve Markets Tariff.
  • The revisions were made in response to a previous FERC order issued on October 17, 2024, and were related to return on equity.
  • The MISO Transmission Owners, including Ameren Services Company, American Transmission Company LLC, and others, were involved in the submission of the revisions.
  • The FERC public noticed the filing and accepted it for filing effective September 28, 2016, as requested.
  • Pursuant to Rule 214 of the Commission's regulations, notices of intervention, timely-filed motions to intervene, and any unopposed motions to intervene out-of-time filed before the issuance date of this order are granted.
  • This action does not constitute approval of any service, rate, charge, classification, or any rule, regulation, contract, or practice affecting such rate or service provided for in the filed document(s); nor shall such action be deemed as recognition of any claimed contractual right or obligation affecting or relating to such service or rate.

Statistics:

  • The FERC issued the delegated order on July 15, 2025.
  • The MISO Transmission Owners include 46 companies.
  • The revisions were made within 9 months of the previous FERC order, which was issued on October 17, 2024.
  • The filing was accepted for filing effective September 28, 2016.
  • The FERC received no protests or adverse comments regarding the submission.

Sources:

  • Federal Energy Regulatory Commission, "DELEGATED ORDER," July 15, 2025, Document Accession #: 20250715-3019.
  • Midcontinent Independent System Operator, Inc., FERC Electric Tariff, Schedule 42-B, Entergy Credit Associated with AFUDC.
  • Ass'n of Bus. Advocating Tariff Equity v. Midcontinent Indep. Sys. Operator, Inc., 189 FERC P 61,036 (2024), order on reh'g, 190 FERC P 61,184 (2025).