# 2026-12706: Midcontinent Grid Operator Faces FERC Pricing Probe

2026-12706, Midcontinent Independent System Operator, Inc.; AEP Indiana Michigan Transmission Company, Inc.; ALLETE, Inc.; Ameren Illinois Company; Ameren Transmission Company of Illinois; American Transmission Company, LLC; Cleco Power LLC; Duke Energy Indiana, LLC; Entergy Arkansas, LLC; Entergy Louisiana, LLC; Entergy Mississippi, LLC; Entergy New Orleans, LLC; Entergy Texas, Inc.; GridLiance Heartland LLC; Indianapolis Power & Light Company; International Transmission Company; ITC Midwest LLC; Michigan Electric Transmission Company, LLC; MidAmerican Energy Company; Montana-Dakota Utilities Company; Northern Indiana Public Service Company LLC; Northern States Power Company, a Minnesota Corporation; Northern States Power Company, a Wisconsin Corporation; Northwestern Wisconsin Electric Company; Otter Tail Power Company; Pioneer Transmission, LLC; Republic Transmission, LLC; Southern Indiana Gas & Electric Company; Union Electric Company; Wabash Valley Power Association, Inc.; Wolverine Power Supply Cooperative, Inc.; Notice of Institution of Section 206 Proceeding and Refund Effective Date, is a Federal Register notice from Energy Department, Federal Energy Regulatory Commission published 2026-06-24, effective 2026-06-24; PRIA reads it as touching household money (as of 2026-07-01).

- Canonical: https://policyrisk.com/federal-register/2026-12706
- As of: 2026-07-01
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-12706
- Title: Midcontinent Independent System Operator, Inc.; AEP Indiana Michigan Transmission Company, Inc.; ALLETE, Inc.; Ameren Illinois Company; Ameren Transmission Company of Illinois; American Transmission Company, LLC; Cleco Power LLC; Duke Energy Indiana, LLC; Entergy Arkansas, LLC; Entergy Louisiana, LLC; Entergy Mississippi, LLC; Entergy New Orleans, LLC; Entergy Texas, Inc.; GridLiance Heartland LLC; Indianapolis Power & Light Company; International Transmission Company; ITC Midwest LLC; Michigan Electric Transmission Company, LLC; MidAmerican Energy Company; Montana-Dakota Utilities Company; Northern Indiana Public Service Company LLC; Northern States Power Company, a Minnesota Corporation; Northern States Power Company, a Wisconsin Corporation; Northwestern Wisconsin Electric Company; Otter Tail Power Company; Pioneer Transmission, LLC; Republic Transmission, LLC; Southern Indiana Gas & Electric Company; Union Electric Company; Wabash Valley Power Association, Inc.; Wolverine Power Supply Cooperative, Inc.; Notice of Institution of Section 206 Proceeding and Refund Effective Date
- Type: Notice
- Agencies: Energy Department; Federal Energy Regulatory Commission
- Citation: 91 FR 37970
- Published: 2026-06-24
- Effective: 2026-06-24
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-07-01

## In one line

Midcontinent Grid Operator Faces FERC Pricing Probe

## Summary

The Federal Energy Regulatory Commission is checking if the Midcontinent Independent System Operator’s market rules are fair and reasonable. This affects many power companies across several states and could lead to changes in how they charge for electricity. If changes happen, refunds might be given starting from June 24, 2026, so keep an eye out!

## Effects PRIA read

- FERC Opens Investigation into MISO Tariff: mixed, medium. On June 18, 2026, the Federal Energy Regulatory Commission issued an order instituting an investigation under section 206 of the Federal Power Act to determine whether the Midcontinent Independent System Operator, Inc.’s Open Access Transmission, Energy, and Operating Reserve Markets Tariff is unju…
- Refunds Effective Date Set: benefit, low. The Commission set the refund effective date for Docket No. EL26-70-000 as the date of publication of this notice in the Federal Register, June 24, 2026. That means any ordered refunds in that docket would be effective beginning on June 24, 2026.

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- [2026-20659](https://policyrisk.com/federal-register/2026-20659): Eastern Shore Natural Gas Company; Notice of Application and Establishing Intervention Deadline, 2026-10-08
- [2026-20642](https://policyrisk.com/federal-register/2026-20642): Combined Notice of Filings, 2026-10-08
- [2026-20580](https://policyrisk.com/federal-register/2026-20580): Northern Natural Gas Company; Notice of Availability of the Environmental Assessment for the Proposed Ventura to Farmington A-Line Abandonm…, 2026-10-08
- [2026-20582](https://policyrisk.com/federal-register/2026-20582): Combined Notice of Filings, 2026-10-08

## Sources
- [2026-12706 on federalregister.gov](https://www.federalregister.gov/documents/2026/06/24/2026-12706/midcontinent-independent-system-operator-inc-aep-indiana-michigan-transmission-company-inc-allete)
- [2026-12706 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-06-24/pdf/2026-12706.pdf)

## Related
- [Previous: 2026-12705, ISO New England Inc.; Central Maine Power Company; The Connecticut Light and Po…](https://policyrisk.com/federal-register/2026-12705)
- [Next: 2026-12707, New York Independent System Operator, Inc.; Central Hudson Gas & Electric Corpo…](https://policyrisk.com/federal-register/2026-12707)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-12706 (as of 2026-07-01).