|Ameren Corporation (Ameren) utility holding company. The Company’s principal subsidiaries are Union Electric Company (Ameren Missouri), Ameren Illinois Company (Ameren Illinois) and Ameren Energy Resources Company, LLC (AER). The Company operates in three segments: Ameren Missouri, Ameren Illinois, and Merchant Generation. Ameren Missouri operates a 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).|
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