Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services in the Midwest region of the United States. It operates through three segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. The company, through its subsidiary, Interstate Power and Light Company (IPL), primarily generates and distributes electricity, and distributes and transports natural gas to retail customers in Iowa; sells electricity to wholesale customers in Minnesota, Illinois, and Iowa; and generates and distributes steam in Cedar Rapids, Iowa. Alliant Energy Corporation, through its other subsidiary, Wisconsin Power and Light Company (WPL), generates and distributes electricity, and distributes and transports natural gas to retail customers in Wisconsin; and sells electricity to wholesale customers in Wisconsin. As of December 31, 2019, IPL supplied electricity to 490,000 retail customers and natural gas to 225,000 retail customers; and WPL supplied electricity to 480,000 retail customers and natural gas to 195,000 retail customers. It offers electric utility services to retail customers in the farming, agriculture, industrial manufacturing, chemical, and packaging 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; customized supply chain solutions; freight and logistics brokering services; and other transfer and storage services. Further, it owns a 347 megawatt (MW) natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and a 225 MW wind farm located in Oklahoma. Alliant Energy Corporation was founded in 1917 and is headquartered in Madison, Wisconsin.

Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services in the Midwest region of the United States. It operates through three segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. The company, through its subsidiary, Interstate Power and Light Company (IPL), primarily generates and distributes electricity, and distributes and transports natural gas to retail customers in Iowa; sells electricity to wholesale customers in Minnesota, Illinois, and Iowa; and generates and distributes steam in Cedar Rapids, Iowa. Alliant Energy Corporation, through its other subsidiary, Wisconsin Power and Light Company (WPL), generates and distributes electricity, and distributes and transports natural gas to retail customers in Wisconsin; and sells electricity to wholesale customers in Wisconsin. As of December 31, 2019, IPL supplied electricity to 490,000 retail customers and natural gas to 225,000 retail customers; and WPL supplied electricity to 480,000 retail customers and natural gas to 195,000 retail customers. It offers electric utility services to retail customers in the farming, agriculture, industrial manufacturing, chemical, and packaging 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; customized supply chain solutions; freight and logistics brokering services; and other transfer and storage services. Further, it owns a 347 megawatt (MW) natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and a 225 MW wind farm located in Oklahoma. Alliant Energy Corporation was founded in 1917 and is headquartered in Madison, Wisconsin.