For Release: 05/07/2012

Wisconsin Public Service Proposes First U.S. Commercial Application of Environmental ReACT Technology at its Weston 3 Power Plant

Green Bay, WI – Wisconsin Public Service Corporation (WPS), a subsidiary of Integrys Energy Group (NYSE: TEG) today filed for a Certificate of Authority (CA) from the PSCW to install Regenerative Activated Coke Technology (ReACT™) at its approximately 321-megawatt Weston 3 plant. ReACT™ is an integrated multi-pollutant control technology that removes SO2, NOx and mercury from coal-fired plants by adsorption with activated coke to attain emission levels found at the best controlled coal-fired plants. WPS said it expects that, based on historical data, the estimated $250 million project will reduce plant SO2 emissions by more than 90%, mercury by 90% or more, and NOx by more than 20%.

"We've decided to upgrade Weston 3 (W3) to ensure its viability as an electric generator in a climate of future uncertainty regarding environmental regulations," said Howard Giesler, Weston General Manager. "Adding this new, but proven, technology will position the unit to be in compliance with future EPA regulations, while enabling the production of safe, clean, reliable and economical electricity."

According to a WPS spokesperson, this new technology simultaneously controls multiple pollutants using only a fraction of the water that conventional wet scrubbers demand, while producing a saleable sulfuric acid by-product commonly used in the fertilizer, paper-making, and many other industries. A recent license agreement brings this technology to North America. WPS has partnered with Hamon Research-Cottrell, Inc. (HRC) to provide the ReACT™ technology, engineering, erection, and other services for the project. HRC holds the license for the ReACT™ technology and provides innovative clean air technologies to a wide array of industries including power generation.

"We are grateful to partner with WPS to bring this proven state-of-the-art, multi-pollutant control technology to North America. The innovation WPS has shown in choosing this technology ensuring we maintain our world leadership in clean coal implementation should be applauded by all in the industry" said Bill Dillon, CEO of Hamon Corporation.

The ReACT™ installation will be the first commercial application of this technology in the United States, although it has been used successfully in Japan for many years and has been successfully demonstrated in the U.S. over a period of five months as part of an Electric Power Research Institute project hosted by Sierra Pacific Power at its North Valmy Station.

Following PSCW approval, the project will take more than 3.5 years to complete and bring more than 200 temporary high-paying construction jobs to the Wausau, WI area.

About Wisconsin Public Service

Wisconsin Public Service Corporation, a wholly owned subsidiary of Integrys Energy Group, Inc. (NYSE: TEG), is an investor-owned electric and natural gas utility headquartered in Green Bay, Wisconsin. It serves approximately 441,000 electric customers and 319,000 natural gas customers in residential, agricultural, industrial, and commercial markets. It also provides electric power to wholesale customers. The company's service area includes northeastern Wisconsin and an adjacent portion of Upper Michigan. Additional information is available online at www.wisconsinpublicservice.com.

About Hamon Research-Cottrell

Hamon Research-Cottrell is a leading provider of air pollution control technology in the United States, having been active for many years in the supply and installation of systems for control of particulate and acid gas emissions. Hamon Research-Cottrell is part of the Hamon Group of companies, headquartered in Mont-St-Guibert, Belgium and providing environmental and energy related technologies for more than 100 years. www.hamonusa.com/hamonresearchcottrell.

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