Strategic Petroleum Reserve

The Strategic Petroleum Reserve (SPR), the world's largest supply of emergency crude oil was established primarily to reduce the impact of disruptions in supplies of petroleum products and to carry out obligations of the United States under the international energy program. The federally-owned oil stocks are stored in huge underground salt caverns at four sites along the coastline of the Gulf of Mexico. The sheer size of the SPR (authorized storage capacity of 714 million barrels) makes it a significant deterrent to oil import cutoffs and a key tool in foreign policy.