Alliant Energy Corporation operates as a utility holding entity, delivering regulated electricity and natural gas provisions. The company's activities are structured across three primary segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. Through its subsidiary, Interstate Power and Light Company (IPL), it is responsible for generating and distributing electricity, and distributing and transporting natural gas to individual consumers across Iowa. IPL also supplies electricity to wholesale buyers in Minnesota, Illinois, and Iowa, in addition to producing and supplying steam within Cedar Rapids, Iowa. By the close of 2021, IPL served around 500,000 retail electricity clients and roughly 225,000 retail natural gas customers. Similarly, its other subsidiary, Wisconsin Power and Light Company (WPL), handles the generation and distribution of electricity, as well as the distribution and transport of natural gas for retail consumers throughout Wisconsin, alongside selling electricity to wholesale accounts within the state. At the same date (December 31, 2021), WPL provided electric service to approximately 485,000 retail clients and natural gas to about 200,000. Its diverse retail clientele spans sectors such as farming, agriculture, industrial manufacturing, chemicals, packaging, and food production. Furthermore, the corporation holds and manages a short-line rail freight operation in Iowa, a multi-modal freight terminal (barge, rail, and truck) situated on the Mississippi River, and a rail-accessible warehouse, also in Iowa. It also provides freight brokerage solutions. The company also possesses stakes in a 347-megawatt (MW) natural gas-powered electricity generation facility near Sheboygan Falls, Wisconsin, and a 225 MW wind energy farm in Oklahoma. Established in 1981, its corporate headquarters are situated in Madison, Wisconsin.