CMS Energy Corp. plans to sell its oil and gas exploration and production unit

CHARLOTTE, N.C., May 30, 2002 — CMS Energy Corp. has announced it plans to put its oil and gas exploration and production unit, CMS Oil and Gas Company, up for sale and exit the exploration and production business.

CMS Energy said it expects to conduct a competitive auction process for its oil and gas company, and will provide details to interested parties in the near future to begin the sale process. CMS has engaged Randall & Dewey, Inc., a Houston-based oil and gas merger and acquisition consulting firm, to advise it in connection with the planned sale.

Proceeds from the sale will be additive to CMS Energy’s current total of $2.4 billion of cash proceeds from asset sales, securitization proceeds and LNG monetization toward its $2.9 billion asset optimization goal by year-end 2002.

CMS Oil and Gas Co. is a developer of oil and natural gas supplies in the Permian Basin of west Texas and internationally in Cameroon, the Republic of Congo, Colombia, Eritrea, Tunisia and Venezuela.

CMS Energy Corporation is an integrated energy company, which has as its primary business operations an electric and natural gas utility, natural gas pipeline systems, independent power generation, oil and gas exploration and production, and energy marketing, services and trading.

For more information on CMS Energy, please visit the web site at: www.cmsenergy.com/