Northwest Natural Gas Company stores and distributes natural gas primarily in Oregon, Washington, and California. The company operates in two segments, Local Gas Distribution and Gas Storage. The Local Gas Distribution segment distributes natural gas in Oregon and southwest Washington. It engages in building and maintaining pipeline distribution system, purchasing gas from producers and marketers, contracting for the transportation of gas over pipelines from the supply basins to service territory, and reselling the gas to customers. This segment also transports gas owned by customers from the interstate pipeline connection, or city gate, to the customers’ facilities. It serves various industrial customers, including pulp, paper, and other forest products; the manufacture of electronic, electrochemical, and electrometallurgical products; the processing of farm and food products; the production of various mineral products; metal fabrication and casting; the production of machine tools, machinery, and textiles; the manufacture of asphalt, concrete, and rubber; printing and publishing; nurseries; government and educational institutions; and electric generation. As of December 31, 2011, this segment had approximately 680,000 utility customers, consisting of approximately 616,000 residential, 63,000 commercial, and 1,000 industrial customers. The Gas Storage segment offers underground natural gas storage services to interstate and intrastate customers. It holds interests in approximately 11,300 net acres of underground natural gas storage in Oregon and 5,000 net acres of underground natural gas storage in California. This segment serves primarily natural gas production or distribution, electric generation, and energy marketing companies. The company was founded in 1910 and is headquartered in Portland, Oregon.