Ameren

Ameren Corporation (Ameren) is a utility holding company.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 anddistribution 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).

1997: The $1.3 billion transaction--expected to save the firm approximately $759 million over a ten-year period--was eventually completed in December 1997 after undergoing scrutiny by several regulatory commissions. 1997: Union Electric and CIPSCO Inc. merge to create Ameren Corporation. Ameren was founded in 1997 and is headquartered in St Louis, MO.“

1999: In 1999, the company's large commercial customers were allowed to choose energy suppliers, which forced it to seek out major contracts with powerful industrial concerns, including Archer Daniels Midland--Illinois' largest electricity customer.

2000: In a merger completed February 1, 2000, Illinova became a wholly owned subsidiary of Dynegy Inc. (NYSE: DYN), in which Chevron Corporation also took a 28% stake. In 2000, Ameren restructured its holdings, transferring five of its AmerenCIPS power plants to a newly created subsidiary, AmerenEnergy Generating Company. In 2000, Ameren formed the holding company, AmerenEnergy Resources.

2001: At the same time, the company became embroiled in a rate dispute with the Missouri Public Service Commission (MPSC). In 2001, the MPSC set forth a proposal of an electric revenue reduction of over $300 million per year.

2002: In 2002, Ameren Corporation announced a voluntary retirement program, which was offered to approximately 1,000 of Ameren’s 7,400 current employees, expecting to realize significant long-term savings. In 2002, Ameren Corporation announced a voluntary retirement program, which was offered to approximately 1,000 of Ameren's 7,400 current employees, expecting to realize significant long-term savings.

2003: At the end of 2003, Ameren’s chairman and chief executive, Charles Mueller, retired and was succeeded in both positions by Gary Rainwater, the company’s president and chief operating officer the past two years. Following the 2003 Ameren acquisition, that utility began doing business as AmerenCILCO.

2004: In December 2004, Ameren announced that Patrick T. Stokes, the president and chief executive officer of Anheuser-Busch Cos., Inc., was elected to the Ameren board of directors.

2010: The power AmerenUE is purchasing will tie into the Midwest Independent System Operator (MISO) transmission grid, of which the company is a member, fulfilling AmerenUE’s commitment to add 100 megawatts of renewable capacity to serve its Missouri customers by 2010.”

2015: In 2015, Ameren became the first major energy company to open an Innovation Center at the Research Park, University of Illinois at Urbana-Champaign.

To power the quality of life for our 1.2 million electric and 132,000 natural gas customers in central and eastern missouri. Our service area covers 64 counties and more than 500 communities including the greater st.

Leading the way to a secure energy future.