Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services to residential, commercial, industrial, and wholesale customers in the Midwest region of the United States. It operates through three segments: Electric, Gas, and Other. The company, through its subsidiary, Interstate Power and Light Company (IPL), primarily generates and distributes electricity, and distributes and transports natural gas in Iowa and southern Minnesota; and generates and distributes steam in Cedar Rapids, Iowa. Alliant Energy, through its subsidiary, Wisconsin Power and Light Company (WPL), generates and distributes electricity, and distributes and transports natural gas in southern and central Wisconsin. As of December, 31, 2014, IPL supplied electricity to 529,000 retail customers and natural gas to 235,000 retail customers; and WPL supplied electricity to 463,000 retail customers and natural gas to 185,000 retail customers. It offers electric utility services to retail customers in food manufacturing, chemical, and paper industries. In addition, the company holds investments in various businesses, which provide freight services through a short-line railway between Cedar Rapids and Iowa City, Iowa; a barge terminal and hauling services on the Mississippi River; and other transfer and storage services. Further, it owns a non-regulated natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and owns the non-regulated 99 MW Franklin County wind project located in Franklin County, Iowa. The company was founded in 1917 and is headquartered in Madison, Wisconsin.