Xcel Energy Incorporated. The Group's principal activities are to generate, purchase, transmit and distribute electricity and natural gas. The Group operates through 3 segments: Electric Utility, Natural Gas Utility and nonregulated energy business. Electric Utility generates, transmits and distributes electricity in the United States and also provides wholesale transmission service. Gas Utility transmits, transports, stores and distributes natural gas and propane. Nonregulated energy develops, acquires, owns and operates non-regulated energy-related businesses, including independent power production, commercial and industrial heating and cooling and energy-related refuse-derived fuel production. Electric utility accounted for 56% of 2002 revenues; Nonregulated, 23%; Gas Utility, 15% and Other, 6%.