NuStar Energy L.P. is engaged in the transportation of petroleum products and anhydrous ammonia; the terminalling and storage of petroleum products, and the marketing of petroleum products. The Company's segments include pipeline, storage and fuels marketing. The pipeline segment consists of the transportation of refined petroleum products, crude oil and anhydrous ammonia. The storage segment consists of facilities that provide storage, handling and other services for petroleum products, crude oil, specialty chemicals and other liquids. The fuels marketing segment involve the purchase of crude oil, fuel oil, bunker fuel, fuel oil blending components and other refined products for resale. It conducts its operations through its subsidiaries, primarily NuStar Logistics, L.P. and NuStar Pipeline Operating Partnership L.P. As of May 4, 2017, it had more than 9,200 miles of pipeline and 81 terminal and storage facilities that provide approximately 96 million barrels of storage capacity.