The nation’s emergency oil reserve has fallen to roughly 375 million barrels as of early 2025, a level that sharply reduces the buffer Washington can rely on during a supply crisis. That inventory, stored in underground salt caverns along the Gulf Coast, is down from 638 million barrels in 2020 after the Department of Energy conducted emergency releases in 2022 and 2023. The drawdown coincided with Russia’s invasion of Ukraine, which tightened global crude markets at a time when geopolitical tensions elsewhere are once again testing the resilience of America’s energy supply chain.
A Shrinking Cushion: The Strategic Petroleum Reserve’s Current Posture
The Strategic Petroleum Reserve was created in the wake of the 1973-1974 oil embargo, when foreign suppliers cut off exports to the United States and prices quadrupled. Congress passed the Energy Policy and Conservation Act of 1975, establishing what became the world’s largest emergency petroleum stockpile. Engineers selected underground salt caverns in Louisiana and Texas for their geological stability and minimal risk of leakage, and the reserve was designed to supply domestic refiners for months if imported crude vanished overnight.
Today, the Department of Energy manages the sites, and the International Energy Agency coordinates releases among its 31 allied economies. At the current volume, the SPR can release up to 4.4 million barrels per day for 90 days — a substantial but not indefinite buffer.
Because the reserve is finite, every drawdown reduces the cushion against future shocks. The repeated emergency sales in 2022 and 2023, meant to offset supply disruptions caused by the war in Ukraine, have now narrowed that margin considerably just as fresh risks emerge around a critical maritime chokepoint.
Geopolitical Flashpoint: The Strait of Hormuz and Oil Price Risks
The Strait of Hormuz, a narrow waterway through which a significant share of global crude oil transits, has become a focus of concern. The United States and Iran have had no formal diplomatic relations since 1980, and analysts at Goldman Sachs estimated in March 2025 that if Iran were to block the strait, oil prices could spike to between $100 and $120 per barrel.
Any closure of the strait could represent a sudden, severe supply cutoff that would test whether domestic production and allied stockpiles can fill the gap. Analysts warn that such a scenario would sharply test Washington’s ability to respond. The next steps may involve discussions at the United Nations Security Council or the imposition of further sanctions. The reserve’s depleted inventory has reduced the margin for error just as the risk of a regional supply cutoff has risen.
The combination of a lower SPR and heightened geopolitical tension raises the stakes for any potential response.
Alternative Sources: Record Domestic Output and Allied Stockpiles
The United States is not solely dependent on the Strategic Petroleum Reserve. Domestic crude production reached a record 13.2 million barrels per day in November 2024, providing a powerful alternative to imported oil.
That domestic output, combined with the SPR, can help soften the impact of a supply disruption, though it cannot entirely replace a prolonged loss of imports from the Middle East. Beyond national assets, the International Energy Agency coordinates emergency stock releases among its 31 member countries. Collectively, those nations hold approximately 1.5 billion barrels of strategic stocks — a sizable pool that can be tapped in a coordinated response.
The IEA was founded in 1974, the year after the oil embargo, to help industrialized economies manage oil supply emergencies through collaborative action. The current SPR inventory, the record domestic production, and the IEA’s collective stockpile give Washington considerable strategic depth.
However, the drawdown over the past three years has reduced the margin for error. The challenge now is that the reserve’s current level tests Washington’s ability to manage both immediate crises — such as a potential blockade of the Strait of Hormuz — and long-term energy security. Every release from the caverns is a trade-off between today’s emergency and tomorrow’s readiness, and the balance has never been more delicate.
