DTE Energy Services Signs Purchase Agreement for Stoneman Power Plant

Plans include conversion to biomass fuel in 2009


ANN ARBOR, Mich., May 29 /PRNewswire/ — DTE Energy Services, Inc. (DTEES) has executed a purchase agreement for the acquisition of the E.J. Stoneman Power Plant from Integrys Energy Services, Inc., a subsidiary of Integrys Energy Group, Inc. (NYSE:TEG) . DTEES plans to convert the 50-megawatt coal- fired plant in Cassville, WI, to burn wood waste, a renewable resource.


“The Stoneman plant offers us an opportunity to apply the expertise and experience that our company has developed with the two wood-waste plants we currently operate,” said David Ruud, President, DTEES. “We are looking forward to working with the officials and residents of Wisconsin in operating this plant in an efficient and environmentally sound manner. By converting the plant to use wood-waste fuel, we will help Wisconsin meet its renewable energy standards and help ensure the Stoneman Power Plant will continue to be a vital part of the Cassville community.”


The sale is subject to regulatory approvals before the purchase can be completed.


Located on the Iowa-Wisconsin border, the Stoneman facility was constructed in 1950. Integrys Energy Services purchased the 53-megawatt capacity coal-fired plant in 1996 from Dairyland Power Cooperative and operated it as a merchant power plant, selling power in the open market.


DTEES, headquartered in Ann Arbor, Mich., acquires, develops, builds, owns and operates projects for large, energy-intensive industrial customers. The company is a subsidiary of DTE Energy Company (NYSE:DTE) , a diversified energy company involved in the development and management of energy-related businesses and services nationwide. Information about DTEES is available at www.dtees.com .


Integrys Energy Group, Inc. (NYSE:TEG) , headquartered in Chicago, Illinois, is a holding company for energy related subsidiaries, which includes regulated utilities and nonregulated subsidiaries.

  The company’s principal nonregulated subsidiary is:
— Integrys Energy Services, Inc., a diversified nonregulated energy
supply and services company serving residential, commercial,
industrial, and wholesale customers in developed competitive markets in
the United States and Canada.

The six regulated utilities consist of:
— The Peoples Gas Light and Coke Company, a natural gas utility serving
approximately 830,000 customers in the City of Chicago.
— Wisconsin Public Service Corporation, an electric and natural gas
utility serving approximately 433,000 electric customers and 314,000
natural gas customers in northeastern Wisconsin and an adjacent portion
of Michigan’s Upper Peninsula.
— Minnesota Energy Resources Corporation, a natural gas utility serving
approximately 207,000 customers throughout Minnesota.
— Michigan Gas Utilities Corporation, a natural gas utility serving
approximately 165,000 customers in lower Michigan.
— North Shore Gas Company, a natural gas utility serving approximately
158,000 customers in the northern suburbs of Chicago.
— Upper Peninsula Power Company, an electric utility serving
approximately 52,000 customers in Michigan’s Upper Peninsula.


More information about Integrys Energy Group, Inc. is available online at www.integrysgroup.com .


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Source: DTE Energy


CONTACT: John J. Austerberry, +1-313-235-8859, or Lorie N. Kessler,
+1-313-235-8807, both of DTE Energy


Web site: http://www.dtees.com/
http://www.integrysgroup.com/