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Ameren Illinois delivers energy to 1.2 million electric and 806,000 natural gas customers in central and southern Illinois.

Ameren Corporation was an American power company created December 31, 1997 by the merger of Missouri's Union Electric Company and the neighboring Central Illinois Public Service Company. It is now a holding company for several power companies and energy companies. The company is based in St. Louis, Missouri, serving 2.4 million electric, and 900,000 natural gas customers across 64,000 square miles.

Ameren is the holding company for the following:

  • Ameren Missouri
  • Ameren Illinois
  • Ameren Transmission Company