Strategic Petroleum Reserve Releases

The Strategic Petroleum Reserve (SPR) is a stockpile of crude oil, stored in underground salt caverns along the U.S. Gulf Coast, created after the 1970s oil shocks specifically so the government would never again be entirely at the mercy of a sudden supply disruption. It can hold several hundred million barrels, and the President can authorize releases — selling oil out of the reserve into the open market — either in a declared emergency (a hurricane knocking out Gulf refining capacity, for instance) or, more controversially, as a tool to lean against high prices even without a technical supply emergency.

An SPR release adds barrels to the market immediately, which mechanically increases supply and tends to push prices down, at least in the short term. Markets react partly to the release itself and partly to its size relative to expectations — a release smaller than rumored can actually push prices up, since it signals less spare capacity is being made available than traders had priced in. Because the reserve is finite and each release draws it down, sustained releases eventually run into a hard limit, and the reserve has to be refilled later by purchasing oil back, which itself adds a source of future demand.