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Gas and Electric Company; the California Electric Power Company; Imperial Irrigation District; and the Bureau of Reclamation. The energy is produced at several hydroelectric plants within or near the market area, in addition to large steamplants located near the load centers. Hoover, Davis, and Parker Powerplants on the Colorado River form a major source of supply. Hoover Dam Powerplant is operated for the Bureau of Reclamation by the city of Los Angeles and the Southern California Edison Company, and Parker Dam and Davis Dam Powerplants by the Bureau of Reclamation. The cities of Pasadena, Burbank, and Glendale operate municipally owned steam and hydroelectric plants, and the Imperial Irrigation District owns and operates steam and hydroelectric plants and distributes energy in the Imperial and Coachella Valleys. Most of the power systems of these agencies are interconnected, but integration of their operations is, in some cases, limited by existing facilities. In Arizona, the principal agencies generating and distributing electric power are the Salt River Project Agricultural Improvement and Power District; the Arizona Public Service Company; the Tucson Gas, Electric Light and Power Company; Citizens Utilities Company; Arizona Electric Power Cooperative; the Bureau of Indian Affairs; and the Arizona Power Authority. In general, these agencies serve the more densely populated areas in the south-central part of the State. The Bureau of Reclamation, by virtue of the power delivered from Hoover, Davis, and Parker Powerplants, is a large producer and distributor of electric energy utilized in the State. 9Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,284,800 byte