National Fuel Gas Company operates as a diversified energy company. It operates through four segments: Exploration and Production, Pipeline and Storage, Gathering, and Utility. The Exploration and Production segment explores for, develops, and produces natural gas and oil in California and in the Appalachian region of the United States. As of September 30, 2019, it had proved developed and undeveloped reserves of 24,873 thousand barrels of oil and 2,949,519 million cubic feet of natural gas. The Pipeline and Storage segment provides interstate natural gas transportation and storage services through an integrated gas pipeline system extending from southwestern Pennsylvania to the New York-Canadian border, and eastward to Ellisburg and Leidy, Pennsylvania; and owns and operates 28 underground natural gas storage fields, as well as 3 other underground natural gas storage fields. This segment also transports natural gas for National Fuel Gas Distribution Corporation, as well as for other u