Hokkaido Electric Power Co. (HEPCO) distributes electricity to almost 3.9 million residential, commercial, and industrial customers on the northernmost Japanese island, Hokkaido. The company operates more than 46,760 miles of transmission and distribution lines, and it owns thermal, hydroelectric, and nuclear power plants (including the No. 1 and No. 2 reactors at Tomari Power Station). HEPCO also purchases and markets wholesale energy; other operations include engineering and construction, energy consulting, electrical appliance sales, telecommunications, information technology, and utility-related services. New businesses include medical imaging systems and realty. The company was founded in 1951.