We're Ameren Corporation (AEE), a St. Louis-based, Fortune 500 company that powers the quality of life for millions of people throughout Illinois and Missouri.
Ameren Illinois provides electric distribution and transmission service, as well as natural gas distribution service, while Ameren Missouri provides vertically integrated electric service, with generating capacity of over 10,200 megawatts, and natural gas distribution service. Combined, we serve 2.4 million electric and more than 900,000 natural gas customers in a 64,000 square mile area. We're the largest electric utility in Missouri and the second largest in Illinois, and we're among the nation's largest investor-owned electric or gas utility.
Ameren Corporation (Ameren) is a utility holding company. The Company’s principal subsidiaries are Union Electric Company (Ameren Missouri) and Ameren Illinois Company (Ameren Illinois). The Company's segments include Ameren Missouri and Ameren Illinois. Ameren Missouri operates a rate-regulated electric generation, transmission and distribution business, and a rate-regulated natural gas transmission and distribution business in Missouri. Ameren Illinois operates a rate-regulated electric and natural gas transmission and distribution business in Illinois. AER consists of non-rate-regulated operations, including Ameren Energy Generating Company (Genco), AmerenEnergy Resources Generating Company (AERG) and Ameren Energy Marketing Company (Marketing Company). In December 2013, the Company announced that it has completed the divestiture of its merchant generation business, formerly known as Ameren Energy Resources Company, LLC (AER).......Read More