CMS Energy Sells Guardian Pipeline Interest

JACKSON, Mich., June 2, 2003 - CMS Energy (NYSE: CMS) announced today that it has sold its one-third membership interest in the Guardian Pipeline, L.L.C., to a subsidiary of WPS Resources Corporation.

Proceeds from the $26 million sale will be used to reduce debt. In conjunction with the sale, $62.5 million of cash that CMS Energy had committed to collateralize a letter of credit was released.

Ken Whipple, CMS Energy's chairman and chief executive officer, said the Guardian sale marks another step forward for the Company's asset sales plan.

"The success of our asset sales program is helping CMS Energy to strengthen its liquidity and reduce debt. The sale of our Guardian interest supports our back-to-basics strategy, which is focused on making us a smaller, stronger company with more predictable earnings and less business risk," he said.

Guardian pipeline stretches about 142 miles from near Joliet, Illinois, into southern Wisconsin. It can transport 750 million cubic feet of natural gas a day.

Wisconsin Energy, headquartered in Milwaukee, Wis., and Viking Gas Transmission, a wholly owned subsidiary of Omaha-based Northern Border Partners, L.P., each hold a one-third interest in the Guardian pipeline, which began operations in December 2002.

Energy is an integrated energy company, which has as its primary business operations an electric and natural gas utility, natural gas pipeline systems, and independent power generation.

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Media Contacts: Jeff Holyfield, 313/436-9253, Dan Bishop, 517/788-2395, or John Barnett, 713/989-7556

Investment Analyst Contact: CMS Energy Investor Relations, 517/788-2590