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 conducts its operations through its wholly owned subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). It operates in three business segments: pipeline, storage and fuels marketing. The Company's pipeline segment consists of the transportation of refined petroleum products, crude oil and anhydrous ammonia. The Company's storage segment includes terminal and storage facilities that provide storage, handling and other services for petroleum products, crude oil, specialty chemicals and other liquids. The Company's fuels marketing segment involve the purchase of crude oil, fuel oil, bunker fuel, fuel oil blending components and other refined products for resale.