About Ameren: St. Louis-based Ameren Corporation (NYSE: AEE) is among the nation's largest investor-owned electric and gas utilities. The largest electric utility in Missouri and the second largest in Illinois, Ameren companies provide energy services to 2.4 million electric and one million natural gas customers throughout its 64,000-square-mile territory. More: Ameren Fact Sheet and Ameren Organizational Structure.
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