Air Pollution Control Equipment Services, Emissions

Iowa pilot plant reports Nox emissions slashed in half

MADISON, Wis., June 21, 2001 — Alliant Energy’s Combustion Initiative, a science and technology-based approach to voluntarily reducing emissions from its coal-fired power plants, has cut nitrogen oxides (NOx) output in half at the first plant to participate in this unique program. The milestone was reached at a fraction of the cost of installing traditional emissions-reduction equipment.

“We’re very excited about these promising results, and we expect to see even more improvement as the project moves ahead at our other plants,” said Erroll Davis, chairman, president and CEO of Alliant Energy. “We believe cost is no longer a significant barrier to NOx emissions.

“The Combustion Initiative is part of our company’s commitment to the environment, our employees, our shareowners and the future,” Davis added. “This program has become an integral component of our organization’s future.”

In winter of 1999, the ML Kapp Power Station in Clinton, Iowa had a nitrogen oxide (NOx) emissions rate of approximately 0.35 pounds per million British thermal units (Btu). Through conducting research, implementing computer modeling, installing new equipment and fine-tuning existing machinery, the facility lowered its NOx emissions rate to about 0.15 pounds per million Btu. Alliant Energy is continuing to optimize the equipment at this plant in hope of reducing emissions even further.

Additionally, this advanced clean-coal option is being implemented at the Edgewater Generating Station in Sheboygan, Wis., and has also begun at seven other coal-fired plants that Alliant Energy operates in Iowa and Wisconsin.

The Combustion Initiative was developed in anticipation of more stringent environmental restrictions for NOx and other chemicals produced when coal is burned. Through a combination of research, development and equipment optimization, the Combustion Initiative is finding innovative ways to reduce emissions, increase thermal efficiency and improve plant reliability.

Throughout the industry, many utilities are using selective catalytic reduction (SCR) equipment to obtain similar results. While these systems are effective, they are also 5-10 times more expensive to install and maintain, and are focused primarily on NOx reductions. Additional systems may be necessary to lessen the impact of other emissions.

The Combustion Initiative has caught the attention of regulatory bodies in both states. “We’re very pleased with the voluntary action Alliant Energy has taken to be a good environmental steward, and with the excellent results that have been achieved at the ML Kapp plant,” said Pete Hamlin, chief of the Iowa DNR’s Air Quality Bureau.

“The project is only in its early stages, but it has already made a positive impact on the environment,” added Lloyd Eagan, director of the Wisconsin DNR’s Bureau of Air Management. “This effort is an excellent example of what can be accomplished through voluntary emission-reduction efforts. Taking the results from one plant and applying and refining them at other facilities will have a tremendous impact in our state and the region.”

“Through this effort, Alliant Energy has once again demonstrated its industry leadership in finding ways to reduce emissions,” said Bill Harvey, Alliant Energy’s executive vice president for generation. “Ultimately, the Combustion Initiative will result in plants that are not only cleaner, but more efficient, which reduces costs, benefiting customers, shareowners and employees alike.”

This advanced clean-coal option works hand-in-hand with Alliant Energy’s Power Pledge program, a long-term commitment to improving the company’s utility infrastructure. The company has pledged to spend more than $2 billion over five years on these efforts, including funding for the Combustion Initiative.

Alliant Energy Corporation ( http://www.alliantenergy.com ), headquartered in Madison, Wis., is a growing energy-services provider with operations both domestically and internationally. Alliant Energy, through its subsidiaries and partners, provides electric, natural gas, water and steam services to more than three million customers worldwide. Alliant Energy Resources, Inc., home of the company’s non-utility businesses, has operations and investments throughout the United States as well as Australia, Brazil, China, Mexico and New Zealand.

SOURCE: Alliant Energy Corporation