Alliant Energy Corporation is an energy holding company with regulated utility providers as well as non-regulated companies involved in delivering energy-related products and services. Headquartered in Madison, Wisconsin, Alliant Energy serves more than three million customers around the globe. Alliant Energy has nearly 8,500 employees across the country and abroad; operating revenues of $2.6 billion (year-end 2002); and total assets of more than $7 billion (year-end 2002). Alliant Energy's utility operations serve more than 1.4 million customers in Iowa, Illinois, Minnesota and Wisconsin. Their service territory covers 54,000 square miles in the heartland of America and includes 9,700 miles of electric transmission lines and 8,000 miles of natural gas main.