Ameren Corporation, together with its subsidiaries, operates as a public utility holding company in the United States. The company operates through four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. It engages in the rate-regulated electric generation, transmission, and distribution business; and rate-regulated natural gas distribution business. The company also generates electricity through coal, nuclear, and natural gas, as well as renewable energy, including hydroelectric, wind, methane gas, and solar.
