For Release: 05/01/2009

WPS Seeks New Natural Gas and Electric Rates for 2010

Green Bay, WI – Wisconsin Public Service Corporation (WPS), a subsidiary of Integrys Energy Group, Inc. (NYSE: TEG), today filed a request for new electric and natural gas rates with the Public Service Commission of Wisconsin. WPS is seeking overall increases of about 4.95 percent for electric rates and 3.44 percent for natural gas rates.

On the electric side, increases in environmental, energy efficiency and reliability costs reflect about 67% of the increase. Because the cost of natural gas has dropped since last summer, customer gas bills will still likely be lower in the 2009-2010 winter than in the 2008-2009 winter if forecasts hold true.

WPS expects the request, if approved, will increase the electric bill of a typical residential customer using 630 kilowatt-hours of electricity monthly by about $4.15. The typical residential natural gas customer using 900 therms of natural gas annually, can expect an average monthly increase of about $3.22

Primary drivers of the increase request include:

Electric

Natural Gas

"We know that rate increases in a tough economy aren't exactly the greatest news," said John Guntlisbergen, Manager-Electric Fuel Cost Recovery. "We've instituted a hiring freeze in an effort to keep costs down."

About Wisconsin Public Service Corporation

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 433,000 electric customers and 314,000 natural gas customers in residential, agricultural, industrial and commercial markets. The company’s service area includes northeastern Wisconsin and an adjacent portion of Upper Michigan. Additional information is available online at www.wisconsinpublicservice.com.

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