Union Electric Company (Ameren Missouri)

Ameren Missouri is a regulated utility providing electric and natural gas services to customers across central and eastern Missouri. As a subsidiary of Ameren Corporation, its mission is to power the quality of life for its customers. The company's operations are headquartered in St. Louis, Missouri, serving a significant portion of the state.

The utility delivers electricity through generation, transmission, and distribution infrastructure, and provides natural gas distribution services. Ameren Missouri serves approximately 1.3 million electric customers and 135,000 natural gas customers across 60 counties and more than 500 communities, including the greater St. Louis area. The company is recognized as the largest electric utility in Missouri, with electric rates that are among the lowest in the nation.

In May 2026, Aaron Melda was appointed Chairman and President of Ameren Missouri. The company continues to invest in its infrastructure, with recent developments including the Missouri Public Service Commission's approval in February 2026 for the Big Hollow Energy Center, a hybrid facility combining natural gas generation with large-scale battery storage. Additionally, Ameren Missouri announced plans in July 2026 for the West Alton Energy Center, a new 2,100-megawatt facility. These initiatives are part of ongoing efforts, including the Smart Energy Plan, to enhance grid reliability and meet future energy demands.