NuStar Energy LP engages in the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage, and marketing of petroleum products. It operates through the following segments: Pipeline, Storage, and Fuels Marketing. The Pipeline segment provides transportation of refined petroleum products, crude oil, and anhydrous ammonia. The Storage segment focuses on terminal and storage facilities, which include storage and handling services on a fee basis for petroleum products, specialty chemicals, crude oil, and other liquids. The Fuels Marketing segment involves the bunkering operation in the Gulf Coast and blending operations related to Central East System. The company was founded in December 1999 and is headquartered in San Antonio, TX.