Missouri Public Service Commission

JEFFERSON CITY, Mo.---The Missouri Public Service Commission (PSC) set an intervention deadline of July 21, 2025, in an application filed by the Union Electric Company d/b/a Ameren Missouri requesting a Certificate of Convenience and Necessity (CCN) to construct, install, own, operate, maintain and otherwise control and manage an electric generating facility to be constructed in Jefferson County, Missouri.

On June 27, 2025, Ameren Missouri filed the CCN application proposing to build an 800-megawatt multi-unit simple cycle natural gas electric generation facility with fuel oil backup capability at the former site of Ameren Missouri’s coal-fired Rush Island Energy Center. Ameren Missouri’s application also asks Commission approval of a 400-megawatt battery storage facility to be built on the Rush Island site in addition to the natural gas electric generation facility.

Ameren Missouri is requesting Commission approval of the proposed facilities by March of 2026. Applications to intervene and participate in this case must be filed no later than July 21, 2025, with the Secretary of the Missouri Public Service Commission, P.O. Box 360, Jefferson City, Mo. 65102-0360, or by using the Commission’s Electronic Filing and Information System (EFIS) at psc.mo.gov.

Individual citizens wishing to comment may click the link below, or contact either the Office of the Public Counsel (Governor Office Building, 200 Madison Street, Suite 650, P.O. Box 2230, Jefferson City, Mo. 65102-2230, telephone 866-922-2959, email mopco@opc.mo.gov) or the Public Service Commission Staff (P.O. Box 360, Jefferson City, Mo. 65102, telephone 800-392-4211, email pscinfo@psc.mo.gov). The Office of the Public Counsel is a separate state agency that represents the general public in matters before the Commission.

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Case No. EA-2025-0238

• EA-2025-0238