Wisconsin Power and Light Company, also known as WP&L, is a supplier of electricity and natural gas. It is a subsidiary of Alliant Energy Company, which serves more than 1 million electric and over 420,000 natural gas customers along with its subsidiaries. Alliant Energy Company offers a range of energy services. It is an investor-owned, public utility holding company that serves clients in the Midwest. The company employs a staff of nearly 5,000 people and has revenues of approximately $3 billion. Alliant Energy Company has assets of up to $8 billion. The company also maintains a natural gas main and electric transmission lines.