Missouri Public Service Commission

Address

200 Madison Street, Governor Office Building, Jefferson City, MO 65101

Phone

(573) 751-3234Fax (573) 751-1847

Website

psc.mo.gov ↗

Utility landscape

• Ameren Missouri IOU

  Eastern Missouri including St. Louis metro and surrounding counties; approximately 1.2 million electric customers

  Ameren Missouri has been active in filing rate cases and Clean Energy Connection tariff expansions. The MPSC approved significant capital recovery mechanisms tied to its Integrated Resource Plan, which emphasizes coal retirement timelines and solar build-out through 2040.

• Evergy Missouri West (formerly Kansas City Power & Light) IOU

  Western Missouri including Kansas City metro, extending into portions of northwest Missouri

  Evergy has pursued grid modernization infrastructure riders and is navigating MPSC scrutiny over its transmission cost allocation practices. Recent rate proceedings have focused on balancing customer rate impacts against capital investment recovery for renewable transition.

• Spire Missouri IOU

  Natural gas distribution across St. Louis metro, Kansas City metro, and rural Missouri; largest gas LDC in the state

  Spire has faced Commission and legislative scrutiny following the controversial Spire STL Pipeline saga. Current regulatory focus includes infrastructure system replacement surcharge (ISRS) filings and ongoing debate over long-term gas demand trajectory amid building electrification policy discussions.

• Liberty Utilities (Empire District Electric) IOU

  Southwest Missouri including Joplin area and portions of the Ozarks

  Operating under Algonquin Power & Utilities (Liberty Utilities) ownership since 2017, Empire District has pursued rate recovery for wind and solar investments in SPP. The MPSC has scrutinized parent-company cost allocations and the appropriate rate base treatment of renewable assets.

• Associated Electric Cooperative Inc. (AECI) coop

  Wholesale power supplier to six G&T cooperatives serving rural Missouri, Iowa, and Oklahoma

  As a generation and transmission cooperative, AECI is subject to limited MPSC retail jurisdiction but faces significant regulatory attention around its coal generation retirement schedule and compliance with SPP market rules. Its member co-ops serve approximately 900,000 Missouri meters.

• City Utilities of Springfield muni

  Springfield and surrounding Greene County communities; provides electric, gas, and transit services

  City Utilities operates outside full MPSC rate jurisdiction as a municipal utility but engages with Commission proceedings on interconnection and wholesale market issues. It has been advancing a notable solar-plus-storage program and navigating SPP capacity accreditation changes affecting resource planning.

Key issues

• Ameren Missouri integrated resource plan (IRP) implementation and coal retirement sequencing: The MPSC is actively monitoring Ameren's commitment to retire Labadie and Sioux coal plants on schedule while ensuring resource adequacy, with intervening parties challenging the pace and sufficiency of replacement capacity additions.
• Electric vehicle infrastructure and rate design: Multiple IOUs have filed or are expected to file EV-specific tariffs and managed charging pilot programs; the MPSC is weighing how to allocate EV infrastructure costs between participating and non-participating customers while avoiding cross-subsidization.
• Natural gas infrastructure long-term prudency and stranded asset risk: Missouri legislative and Commission debate over whether continued gas distribution infrastructure investment (particularly ISRS-eligible projects) is prudent given potential demand erosion, with consumer advocates pushing for formal long-term demand forecasting requirements.
• Grid modernization and Advanced Metering Infrastructure (AMI) cost recovery: Evergy and Ameren Missouri both have pending or recently approved AMI deployment plans; the MPSC is scrutinizing cost-benefit methodologies and the linkage between smart meter deployment and dynamic rate offerings required to justify infrastructure riders.
• Renewable energy certificate (REC) accounting and voluntary green tariff program compliance: The MPSC has opened investigative proceedings into whether large commercial customers procuring power through utility green tariffs are receiving accurately retired RECs, following national scrutiny of REC double-counting practices.

Upcoming

• 2026-09-15

  Estimated deadline for public comments on Ameren Missouri's 2026 Integrated Resource Plan update filing; MPSC staff report expected to follow within 60 days per procedural schedule.

• 2026-10-07

  Estimated evidentiary hearing date in Evergy Missouri West general rate case (anticipated filing mid-2026); procedural schedule likely to place hearings in fall 2026 with a final order by early 2027.

• 2026-11-18

  Estimated MPSC technical conference on grid modernization cost recovery standards, following the Commission's 2025 notice of inquiry into AMI and distribution automation rider frameworks applicable to Missouri IOUs.

• 2027-01-31

  Estimated deadline for Spire Missouri's next annual Infrastructure System Replacement Surcharge (ISRS) filing and associated MPSC prudency review; hearing likely in first quarter 2027 per established annual docket cycle.