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Alliant Energy Corporation operates in electric and gas utility businesses in the United States. The company, through its subsidiary, Interstate Power and Light Company, engages in the generation and distribution of electric energy; and the purchase, distribution, transportation, and sale of natural gas in Iowa and southern Minnesota. As of December 31, 2007, it supplied electric and gas services to approximately 526,401 and 233,903 retail customers. Alliant Energy Corporation also provides steam services and various other energy-related products and services to customers in Iowa. The company, through its other subsidiary, Wisconsin Power and Light Company (WPL) involves in the generation and distribution of electric energy; and the distribution and transportation of natural gas primarily in south and central Wisconsin markets. WPL supplied electric and gas services to approximately 450,920 and 175,887 retail customers. In addition, Alliant Energy Corporation has investments in environmental consulting, engineering and renewable energy services, and transportation businesses. The company was founded in 1917 and is based in Madison, Wisconsin.
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