The U.S. Strategic Petroleum Reserve— a federal stockpile of crude oil stored in underground salt caverns along the Gulf Coast—stood at 283.8 million barrels for the week ending September 18, 2026, the lowest level since October 1982, according to the Energy Information Administration. A year earlier, the reserve held 406.0 million barrels; the 122-million-barrel reduction reflects the cumulative effect of releases authorized to address energy market disruption.
The current drawdown began with a March 2026 authorization by President Trump releasing 172 million barrels from the SPR as part of a coordinated 400 million-barrel drawdown by 32 International Energy Agency member countries. The discharge was scheduled to take approximately 120 days, with the administration pledging to refill about 200 million barrels within a year at no cost to taxpayers.
Two floors govern how far the reserve can fall. Federal law sets an operational minimum of 252.4 million barrels, while the generally accepted operational minimum—based on practical pumping capacity—is 250 to 300 million barrels on hand. At 283.8 million, the reserve is within that band but approaching the lower bound of what can be efficiently processed and pumped from the caverns.
Part of the drawdown is structured as swaps with Shell, Vitol and Trafigura. Under these contracts, the traders return 1.25 barrels for each barrel they took, with deliveries scheduled to begin early next year. The remaining balance of the replenishment pledge depends on future purchases whose timing and cost have not been detailed, though the DOE stated the replacement would occur 'within the next year' without taxpayer expense.
Energy analyst Ben Cahill of the Atlantic Council warned that the releases carry diminishing returns: releasing more oil into the market is 'overwhelmed by the perception that we're running out of options.' The SPR drawdown aligns with broader market stress from reduced Iranian export flows through Hormuz, where shipping traffic has fallen sharply.
What happens to the reserve depends on future oil market conditions. If supply lines through the Strait of Hormuz are restored to pre-conflict levels, the SPR could be refilled as promised. If not, the statutory minimum will eventually become the binding constraint, requiring congressional action to permit further sales or emergency purchases.
Source text identifies SPR at 283.8 million barrels as of September 18, 2026, citing EIA data and the OilPrice.com report, with the DOE press release of March 11, 2026 confirming the 172-million-barrel release authorization and replacement pledge.