Interstate Power and Light Company Partners with Hardin-Hilltop Wind Developers to Expand Renewable Portfolio

Interstate Power and Light Co. (IPL), a subsidiary of Alliant Energy Corporation (NYSE: LNT) has partnered with developers of the Hardin-Hilltop Wind Project to purchase approximately 16 megawatts (MW) of renewable energy generated by the wind turbines, located northwest of Jefferson, Iowa.

The Hardin-Hilltop Wind Project, which became commercially operable in May 2007, consists of eight investors. Seven of the investors are from Jefferson, including Wind Family Turbine, LLC. Edison Mission, a subsidiary of Southern Cal Edison, has also invested in the wind project. Each of the investors owns a single wind turbine, which has the capability to generate more than two MW’s. In 2006, IPL reached an agreement to purchase the energy generated from the seven wind turbines. Given the size and ownership of the project, IPL is eligible to receive the Iowa small renewable tax credit.

IPL remains committed to expanding its renewable energy portfolio. Earlier this year, IPL announced plans to construct an additional 100 megawatts of new wind generation in Guthrie and Audubon Counties in Iowa as part of its long-term generation growth strategy. Upon completion of the project, tentatively scheduled to be commercially operable in late 2009, IPL will derive approximately six percent of its electricity generation through renewable energy resources. Currently, IPL has approximately 260 MW of wind energy under contract in its energy portfolio.

“Our company is proud to partner with Wind Family Turbine LLC and the other investors in this project,” explains Tom Aller, president of IPL. “Tom Wind of Wind Family Turbine LLC has been instrumental in seeing this project through from start to finish and our company commends him for his efforts. Mr. Wind is a leader and strong advocate for our state’s renewable energy industry. This is also a great day for the community of Jefferson as this project is a shining example of how our state provides continuous opportunities to be a leader in renewable energy and further Iowa’s economic development potential.”