Ameren Corporation is a public utility holding company that provides regulated electric and natural gas services in the United States. The company operates through key segments including Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission, each focused on specific parts of the energy delivery chain. Ameren owns and operates rate-regulated generation, transmission, and distribution assets that supply electricity and natural gas to residential, commercial, and industrial customers, primarily across Missouri and Illinois. Its networks deliver power and gas to millions of customers, making it a core infrastructure provider in its service territories. Headquartered in St. Louis, Missouri, Ameren plays a significant role in the regulated utilities sector, with operations centered on maintaining reliable energy delivery, grid infrastructure, and customer service. The company’s business model is anchored in regulated returns on its utility assets, positioning Ameren as a key participant in North American regulated electric and gas utilities markets.