Alliant Energy operates as a regulated investor-owned public utility holding company that provides regulated electric and natural gas services. It operates through four subsidiaries: Interstate Power and Light Company, a public utility that generates and distributes electricity and distributes and transports natural gas in Iowa; Wisconsin Power and Light Company, a provider of similar services as IPL in southern and central Wisconsin; Resource, organized to manage non-regulated investments; and Corporate Services, a provider of administrative services to Alliant Energy and its subsidiaries.