CMS Energy Corporation (CMS Energy) is an energy company. The Company operates in three segments: consumers electric utility, consumers gas utility and enterprises. CMS Energy is engaged in independent power production and owns power generation facilities fueled by natural gas and biomass. Its subsidiaries include Consumers Energy Company (Consumers) and CMS Enterprises Company (CMS Enterprises). Consumers is an electric and gas utility, and CMS Enterprises is a domestic independent power producer. The Consumers electric utility segment's operations include the generation, purchase, distribution and sale of electricity. CMS Energy's enterprises segment is engaged in domestic independent power production and the marketing of independent power production. Consumers' gas utility operations include the purchase, transmission, storage, distribution and sale of natural gas.