What is the Strategic Petroleum Reserve?

The Strategic Petroleum Reserve (SPR) is a US government-owned emergency crude oil stockpile stored in massive underground salt caverns along the Gulf Coast of Texas and Louisiana. Created by Congress in 1975 in response to the 1973 Arab oil embargo, the SPR was designed to protect the US economy from severe oil supply disruptions by maintaining a strategic buffer that could be released to stabilize markets during emergencies.

At its peak in 2009, the SPR held approximately 727 million barrels of crude oil. The maximum storage capacity of the facility is 714 million barrels across four sites (Bryan Mound, Big Hill, West Hackberry, and Bayou Choctaw). As of recent data, the SPR holds roughly 370 million barrels, its lowest level since the early 1980s, following the historic drawdown of 2022 and smaller releases over the preceding decade.

The 2022 drawdown was the largest in the SPR's history. The Biden administration released approximately 180 million barrels to combat surging oil prices following Russia's invasion of Ukraine and OPEC+'s production restraint. The releases temporarily increased global oil supply by about 1 million barrels per day, helping to moderate gasoline prices. The administration subsequently announced plans to refill the reserve at lower prices, though replenishment has been slow due to budget constraints and competing fiscal priorities.

For oil market analysts, SPR levels and release/refill plans are significant supply variables. SPR releases add to market supply and push prices lower, while announced purchases for refilling create additional demand and support prices. The diminished SPR buffer also reduces the government's ability to respond to future supply shocks, a vulnerability that OPEC+ members monitor when calibrating their own production decisions. Weekly SPR inventory data is published by the EIA and is closely watched alongside commercial crude inventory data as part of the overall US oil supply picture.