Ameren Corporation is a U.S. based public utility holding company and its operations are divided into four different segments namely Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. The company primarily generates electricity from renewable and non-renewable sources of energy to cater residential, commercial, and industrial customers. Ameren Corporation was established in 1881 and is currently headquartered in St. Louis, Missouri.