PacifiCorp has refocused on its core businesses: regulated utilities Pacific Power and Rocky Mountain Power, which together provide electricity to 1.8 million customers in six western states. The subsidiaries operate 16,300 miles of transmission lines and 62,800 miles of distribution lines. PacifiCorp owns or has stakes in almost 75 thermal, hydroelectric, and renewable generation facilities that supply its utilities with about 10,600 MW of net capacity. Its PacifiCorp Energy unit purchases power from other generators, and it sells excess power to wholesale customers in the western US. The company is a unit of Berkshire Hathaway's MidAmerican Energy Holdings.