PacifiCorp is an electric power company in the western United States. PacifiCorp has two business units: 1. * Pacific Power, a regulated electric utility with service territory throughout Oregon, northern California, and southeastern Washington. 2. * 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.