Alliant Energy Corporation operates as a regulated investor-owned public utility holding company. The Company's segments include Utility and Non-regulated, Parent and Other. The Utility segment includes the operations of Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL), which serve retail customers in Iowa and Wisconsin. The Utility segment includes utility electric operations, utility gas operations and utility other, which includes steam operations and the unallocated portions of the utility business. Its Non-regulated, Parent and Other segment includes the operations of Alliant Energy Resources, LLC and its subsidiaries; Alliant Energy Corporate Services, Inc. (Corporate Services); the Alliant Energy parent company, and any Alliant Energy parent company consolidating adjustments. IPL and WPL own a portfolio of electric generating units located in Iowa, Wisconsin and Minnesota with a fuel mix, including coal, natural gas and renewable resources.