HollyFrontier refines crude oil to produce gasoline, diesel, and jet fuel, and sells it in erstwhile American frontier territories: the Southwest, northern Mexico, Kansas, and the Rockies. Its major assets are a 52,000 barrels-per-day refinery in Wyoming; theEl Dorado, Kansas refinery, 135,000 barrels; a Utah refinery, 31,000 barrels; a Tulsa refinery, 125,000 barrels; and subsidiary Navajo Refining (New Mexico) which has a capacity of 100,000 barrels a day. The company also has a 39% stake in Holly Energy Partners (HEP), which operates crude oil and petroleum product pipelines. It also has owns 50% of Sabine Biofuels II, LLC.