Ameren Corporation NYSE: AEE was 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 sq. mi.
Key people are Thomas Voss, Chairman, CEO, & President; Greg Nelson and Senior VP and General Counsel.