Alliant Energy is a regulated investor-owned utility holding company that supplies electric and natural gas service to millions of customers across Iowa and Wisconsin through two public utility subsidiaries. The company generates, transmits, and distributes electricity through owned generation assets (including gas, coal, wind, solar, and hydro sources) and distributes and transports natural gas to residential, commercial, industrial, and municipal customers who have no alternative suppliers under regulated utility law. Revenue derives primarily from cost-of-service regulated retail rates approved by state regulators, supplemented by wholesale electricity sales, with natural gas commodity costs passed through to customers, while the company also holds minority investments in renewable energy projects, transmission infrastructure, venture funds focused on emerging energy technologies, and non-utility businesses including rail freight and supply chain operations.