CMS Energy Corporation, through its subsidiaries, operates in energy businesses primarily in Michigan, the United States. It operates in three segments: Electric Utility, Gas Utility, and Enterprises. The Electric Utility segment engages in the generation, purchase, distribution, and sale of electricity. The Gas Utility segment involves in the purchase, transportation, storage, distribution, and sale of natural gas. The Enterprises segment engages in independent power production and electric distribution. The company primarily serves automotive, metal, chemical, food products, and various other industries. As of December 31, 2007, it served 1.8 million electric customers and 1.7 million gas customers. The company was founded in 1987 and is based in Jackson, Michigan.
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