National Fuel Gas Co is a diversified energy company engaged in the production, gathering, transportation, distribution, and marketing of natural gas. The operating segments of the company are the Exploration and Production segment, the Pipeline and Storage segment, the Gathering segment, and the Utility segment. The company generates a majority of its revenue from the Exploration and Production segment which is engaged in the exploration for, and the development and production of, natural gas in the Appalachian region of the United States. Geographically, the company operates in the United States.