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- Ameren Corporation
Ameren Corporation powers the quality of life for 2.4 million electric customers and more than 900,000 natural gas customers in a 64,000-square-mile area through its Ameren Missouri and Ameren Illinois rate-regulated utility subsidiaries. Ameren Illinois provides electric delivery and transmission service as well as natural gas delivery service while Ameren Missouri provides vertically integrated electric service, with generating capacity of 10,300 megawatts, and natural gas delivery service. Ameren Transmission Company of Illinois develops regional electric transmission projects.