PacifiCorp is an electric power company in the western United States. PacifiCorp has two business units: Pacific Power, a regulated electric utility with service territory throughout Oregon, northern California, and southeastern Washington. Rocky Mountain Power, a regulated electric utility with service territory throughout Utah, Wyoming, and southeastern Idaho. PacifiCorp operates one of the largest privately held transmission systems in the U.S. within the western Energy Imbalance Market. Pacific Power and Rocky Mountain Power combined serve over 1.6 million residential customers, 202,000 commercial customers, and 37,000 industrial and irrigation customers, for a total of approximately 1,813,000 customers. The service area is 143,000 square miles. The company owns and maintain 16,500 miles of long-distance transmission lines, 64,000 miles of distribution lines, and 900 substations. Wikipedia