Ameren Corporation

Founded in 1997, Ameren operates as a public utility holding company with four segments. Engaging in rate-regulated electric generation, transmission, and distribution activities; and rate-regulated natural gas distribution and transmission businesses. Primarily generating electricity through coal, nuclear, and natural gas, as well as renewable sources, such as hydroelectric, methane gas, and solar. Ameren serves residential, commercial, and industrial customers. The company is headquartered in St. Louis, Missouri.