Alliant Energy Releases Annual Environmental Report

Strategic plan continues to balance efficiency, energy and the environment

MADISON, Wis., Aug. 28 /PRNewswire-FirstCall/ — Alliant Energy Corporation (NYSE:LNT) released its annual Environmental Report today, which highlights Interstate Power and Light Company’s (IPL) and Wisconsin Power and Light Company’s (WPL) environmental performance, as well as the status of plans to upgrade its utilities’ electric generation fleet, expansions to its renewable energy portfolio and energy efficiency programs.

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The report, which is available at the company’s website at http://www.alliantenergy.com/, details the utilities’ efforts to establish strong biomass markets in Wisconsin and Iowa, and outlines the progress of mercury emissions monitoring at power plants. This year, the report includes an appendix focusing on energy efficiency programs for commercial/industrial, residential and agricultural utility customers, and examples of successful energy efficiency projects.

“Our renewable energy portfolio is doubling in size, we’re planning to use the latest and most reliable coal technology available and our energy efficiency programs are among the best in the nation,” said Bill Harvey, Chairman, President and Chief Executive Officer, Alliant Energy. “We’ve worked very hard for the right to say that what we’ve done and where we’re going is the result of executing a well balanced plan.”

Other key information in the report includes:

— Installation and retrofitting of more than 1.4 million electric, natural gas and steam meters with Advanced Meter Infrastructure (AMI) to improve energy forecasting and minimize purchasing energy on the spot market.

— The 378 megawatts of wind energy IPL and WPL purchase in Iowa, Minnesota and Wisconsin ranks Alliant Energy in the Top 10 among investor-owned utilities, according to the American Wind Energy Association. IPL and WPL will invest over $1 billion in new wind energy by the end of 2010.

— In 2007, IPL and WPL energy efficiency programs resulted in new, additional savings of over 200,000 megawatt-hours of electricity and almost 7 million therms of natural gas.

“As we continue to look for greener sources to provide reliable and affordable energy, we are also adding to our already-strong lineup of energy efficiency programs,” said Kathy Lipp, chief environmental officer. “Knowing the options and making informed choices are essential to reducing the amount of energy needed to live comfortably and safely.”

A section of the report focusing on air emissions includes Alliant Energy’s position on climate change, first announced in 2006, and reports on the progress of its Clean Air Compliance Program. Land and water management projects throughout the utilities’ service territories are also featured.

Alliant Energy is an energy-services provider with subsidiaries serving approximately 1 million electric and over 400,000 natural gas customers. Providing its customers in the Midwest with regulated electric and natural gas service is the company’s primary focus. Alliant Energy’s utility subsidiaries are Interstate Power and Light and Wisconsin Power and Light companies. Alliant Energy, headquartered in Madison, Wis., is a Fortune 1000 company traded on the New York Stock Exchange under the symbol LNT. For more information, visit the company’s Web site at http://www.alliantenergy.com/.

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Source: Alliant Energy Corporation

CONTACT: Media, Steve Schultz, +1-608-458-3285, or Investor Relations,
Jamie Freeman, +1-608-458-3274, both of Alliant Energy Corporation

Web site: http://www.alliantenergy.com/