NuStar Energy L.P. engages in the terminalling, storage, and marketing of petroleum products; and transportation of petroleum products and anhydrous ammonia. The company has operations in the United States, Canada, Mexico, the Netherlands, St. Eustatius in the Caribbean, and the United Kingdom. It operates through three segments: Pipeline, Storage, and Fuels Marketing. The Pipeline segment transports refined petroleum products, crude oil and anhydrous ammonia. The Storage segment owns terminal and storage facilities, which offer storage, handling, and other services for petroleum products, crude oil, specialty chemicals, and other liquids. Certain terminals also provide pilotage, tug assistance, line handling, launch, emergency response, and other ship services. The Fuels Marketing segment is involved in the purchase of crude oil and refined petroleum products for resale. As of December 31, 2014, the company had 5,463 miles of refined product pipelines with 21 associated terminals that offer storage capacity of 4.9 million barrels and 2 tank farms providing storage capacity of 1.4 million barrels; 2,000 miles of anhydrous ammonia pipelines; 1,180 miles of crude oil pipelines with 3.5 million barrels of associated storage capacity; and 53 terminal and storage facilities, which offer 80.9 million barrels of storage capacity. Riverwalk Logistics, L.P. serves as the general partner of the company and is owned by NuStar GP Holdings, LLC. NuStar Energy L.P. was founded in 1999 and is headquartered in San Antonio, Texas.