Ameren Corp.

Public Company, Headquarters Location
PO Box 66149, Saint Louis, MO 63166-6149, United States
(314)621-3222, http://www.ameren.com

Primary SIC: Electric And Other Services Combined, Primary NAICS: Electric Power Distribution
Description: Ameren Corporation, headquartered in St. Louis, Missouri, is a public utility holding company. Ameren's subsidiaries operate rate-regulated electric generation, transmission and distribution businesses; rate-regulated natural gas transmission and distribution businesses; and non-rate-regulated electric generation businesses in Missouri and Illinois. Ameren's principal subsidiaries are Union Electric Company, also known as AmerenUE, which operates a rate-regulated electric generation, transmission and distribution business; and a rate-regulated natural gas transmission and distribution business in Missouri. Central Illinois Public Service Company, also known as AmerenCIPS, operates a rate-regulated electric and natural gas transmission and distribution business in Illinois. Central Illinois Light Company, also known as AmerenCILCO, operates a rate-regulated electric transmission and distribution business; a primarily non-rate-regulated electric generation business; and a rate-regulated natural gas transmission and distribution business in Illinois. Illinois Power Company, also known as AmerenIP, operates a rate-regulated electric and natural gas transmission and distribution business in Illinois. Ameren acquired IP on September 30, 2004 from Dynegy, which had acquired it with Illinova in early 2000. Ameren has various other subsidiaries responsible for the short- and long-term marketing of power, procurement of fuel, management of commodity risks, and provision of other shared services.Utilities: Electric power, natural gas and steam distribution.