National Fuel Gas Co is an integrated natural gas company. It explores for, produces, stores, transmits, and distributes natural gas. The company's natural gas utility serves about 740,000 customers in New York and Pennsylvania. Its increasingly important Seneca Resources subsidiary is involved in exploring for and producing oil and gas in the U.S., with rough 92% of production stemming from the Marcellus. NFG's midstream assets in the Appalachian region offer gathering, transportation, and storage capacity to Seneca and third-party producers.