PacifiCorp, together with its subsidiaries, operates as a regulated electric company in the United States. The company generates, transmits, and distributes electricity to 1.7 million retail customers, including residential, commercial, industrial, and other customers. It owns or has interests in 75 thermal, hydroelectric, wind-powered, and geothermal generating facilities. As of December 31, 2011, the company's portfolio of generating facilities had a net owned capacity of 11,234 megawatts. It also transmits electricity through approximately 16,200 miles of transmission lines. In addition, the company buys and sells electricity on the wholesale market with public and private utilities, energy marketing companies, financial institutions, and incorporated municipalities. It delivers electricity to customers in Utah, Wyoming, and Idaho under the Rocky Mountain Power trade name; and to customers in Oregon, Washington, and California under the Pacific Power trade name, as well as operates electric generation, commercial and trading, and coal mining functions under the PacifiCorp Energy trade name. The company was founded in 1910 and is headquartered in Portland, Oregon. PacifiCorp is a subsidiary of MidAmerican Energy.