National Fuel Gas Company is a vertically integrated natural gas enterprise with operations organized into four principal segments: Exploration and Production, Pipeline and Storage, Gathering, and Utility. The Exploration and Production segment, operated through its subsidiary Seneca Resources, focuses on developing natural gas reserves in the Marcellus and Utica shales in the Appalachian region. The Pipeline and Storage segment manages an extensive network of interstate pipelines and underground storage fields, transporting gas for affiliated and non-affiliated customers. The Gathering segment builds and operates facilities to process and move gas from wellheads to interstate pipelines. Finally, the Utility segment provides regulated natural gas distribution services to over 750,000 residential, commercial, and industrial customers across western New York and northwestern Pennsylvania. The company is notable for being one of the earliest gas utility companies in the United States and maintains a unique vertically integrated model in the modern energy sector.