The US Strategic Petroleum Reserve (SPR) has fallen to approximately 316.5 million barrels, its lowest level since April 1983, according to the Energy Department. The reserve's depletion follows a 172-million-barrel emergency release authorized by the Trump administration in March 2026 as part of an International Energy Agency-coordinated response to the Iran conflict.
How the reserve dwindled
The coordinated IEA action saw 400 million barrels released globally, with the US contributing the largest share. By mid-July 2026, nearly 99 million barrels had been drawn down specifically due to Iran-related disruptions. The SPR's total authorized capacity is 714 million barrels, meaning it now operates at about 44% of capacity. The previous recent low was roughly 347 million barrels in 2023 after Biden-era releases aimed at curbing fuel prices.
Market and fiscal implications
The shrinking strategic buffer is likely to increase the risk premium on crude oil, pushing up gasoline and diesel prices for consumers. Refilling the reserve will require tens of billions of dollars at current oil prices, adding to US fiscal strain amid ongoing debates over national debt. The Energy Department has urged markets to remain calm, but the low inventory underscores potential vulnerabilities in the event of further supply disruptions.