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Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas in Missouri and Illinois. It serves 2.5 million electricity customers and approximately 1 million natural gas customers.
American Water Works is the largest investor-owned US water and wastewater utility, serving approximately 3.5 million customers in 16 states. It provides water and wastewater services to residential, commercial, and industrial customers and operates predominantly in regulated markets. The company's nonregulated business is water services for military bases, which operates under long-term contracts with regulated-like returns.