Alliant Energy Corporation is a regulated, investor-owned public utility holding company providing regulated electric and natural gas service to approximately 1 million electric and 412,000 natural gas customers in the upper Midwestern states of Iowa, Wisconsin and Minnesota.
Alliant Energy, headquartered in Madison, Wis., is an investor-owned public utility holding company traded on the New York Stock Exchange under the symbol “LNT.”
For more than 100 years, Alliant Energy and our predecessor companies have kept homes warm, lights burning and factories running across the upper Midwest and around the world.
In addition, our focus extends beyond our energy operations. Every day, we demonstrate our commitment to community involvement.

Alliant Energy's utility operations serve more than 1.4 million customers in Iowa, Minnesota and Wisconsin. Our 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.
We maintain a strong fleet of fossil fuel and renewable generating facilities across the upper Midwest, generating more than 31 million megawatt hours of electricity each year.
Utility business
Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL) are Alliant Energy’s two utility subsidiaries. As the primary targets of our future capital investments, the utilities also represent our growth platform. The strategic plan for Alliant Energy’s utility operations is concentrated on:
Learn more about our utility operations
Non-regulated businesses
Alliant Energy Resources is the parent company of Alliant Energy’s non-regulated businesses. The strategic plan for Alliant Energy’s non-regulated operations involves maintaining a portfolio of businesses that are accretive to earnings but not significant users of capital.
Learn more about our non-regulated businesses
Support services
Alliant Energy Corporate Services, Inc. supports the company with traditional administrative functions including strategy, accounting, communications, legal, regulatory, information technology, environmental and safety management and more.
2009 was a challenging year but we moved forward with our strategic plan. We placed our second company-owned wind project into service, while continuing to set the stage for two others; we neared completion of our initial advanced metering infrastructure installation project in Wisconsin; and are constructing our first of several environmental control projects. We also successfully worked with state regulatory commissions to reach fair and balanced decisions during these challenging economic times, and implemented cost cutting procedures across the organization to mitigate the weak sales caused by a struggling economy and the coolest summer in history in our service territories.
Learn more about our company, our 2009 accomplishments and financial results, and Alliant Energy’s path to a greener future.