Ameren Corporation is a public utility holding company headquartered in St. Louis, Missouri, that provides electric and natural gas services to customers in Missouri and Illinois. The company operates through four primary segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. Ameren Missouri is a vertically integrated utility that handles electric generation, transmission, and distribution, alongside natural gas distribution. Ameren Illinois operates as a delivery-only utility for both electricity and natural gas. The company serves approximately 2.4 million electric and 900,000 natural gas customers across a 64,000-square-mile territory. Ameren's generation portfolio includes coal, nuclear, natural gas, and renewable energy sources such as hydroelectric, wind, and solar power.
