Ameren Missouri (Union Electric)
Ameren Missouri, formerly Union Electric Company, is a regulated electric and natural gas utility serving approximately 1.2 million electric customers and 130,000 natural gas customers across a wide swath of central and eastern Missouri including the St. Louis metropolitan area, a wholly owned subsidiary of Ameren Corporation (NYSE: AEE) — one of the nation's largest regulated utility holding companies serving approximately 2.4 million customers across Missouri and Illinois. Ameren Missouri's electric service territory encompasses the Greater St. Louis metro area and extends across central and southeastern Missouri, covering one of the Midwest's most economically significant metropolitan regions alongside extensive rural and agricultural service areas. According to its website at ameren.com, Ameren Missouri is committed to providing safe, reliable, and increasingly clean electricity to its Missouri customers while investing in the clean energy infrastructure that supports Missouri's economic development and environmental goals.
Ameren Missouri's clean energy transition, described at ameren.com, includes significant investment in wind and solar generation that is transforming the company's generation portfolio toward renewable resources — with plans to retire coal generation and replace it with a combination of wind, solar, and battery storage resources that progressively increase the clean energy share of Ameren Missouri's electricity supply. The company's renewable energy expansion has included large-scale wind energy contracts and solar farm development across Missouri that leverage the state's wind resources in its northern and western regions and solar potential across the state. Ameren Missouri's regulatory framework in Missouri — which includes the Missouri Public Service Commission's oversight of rates and service standards — provides the mechanism for earning a regulated return on clean energy infrastructure investments.
Ameren Corporation's ownership of both Ameren Missouri and Ameren Illinois Utilities provides the parent company with a diversified regulated utility portfolio serving millions of customers across two Midwestern states, with the scale advantages of a large utility holding company in procurement, capital markets, regulatory affairs, and operational excellence programs. According to ameren.com, Ameren Missouri's St. Louis metropolitan area service territory — one of the Midwest's largest metropolitan economies — provides a stable and growing electric demand base that supports the regulated capital investment program required for grid modernization and clean energy development. Ameren Missouri's combination of St. Louis metropolitan utility franchise, significant clean energy transition investment, Ameren Corporation institutional backing, and essential Missouri energy infrastructure role establishes it as a major participant in the Missouri energy market.