US oil reserve falls below 300 million barrels, lowest since 1983

The US Strategic Petroleum Reserve slipped to 298.7 million barrels in the week ended Aug. 10, the lowest since January 1983, as a 172-million-barrel Iran-war release drains the nation's emergency buffer.

"Yet another inflation impulse. The US basically has NO Strategic Petroleum Reserve anymore," RBA wrote in a note shared by CNBC's Carl Quintanilla.

The reserve shed 6.1 million barrels in a single week and now sits roughly 42 percent full against authorized capacity of 714 million barrels. It remains above the statutory minimum of 252.4 million barrels under the Energy Policy and Conservation Act, though the Department of Energy said in July that about 70 million barrels is the real safe-operating floor. Before the US and Israel launched their attack on Iran on Feb. 28, the SPR held approximately 415 million barrels.

The drawdown is part of an IEA-coordinated release in which member nations have collectively committed 400 million barrels — the largest emergency stock mobilization the agency has ever undertaken. With Brent last trading at $88.90 a barrel after a July spike to $105.32, and gasoline at $4.08 a gallon, the question is how much further Washington can push before refilling becomes urgent.

The mechanism matters: this is largely a lending program, not outright sales. The Department of Energy has contracted out more than 133 million barrels to companies that must return the same volume later, with repayment premiums as high as 28 percent on individual deals. Brent spiked around Aug. 9-10 as Middle East cease-fire talks stalled, giving RBA's "inflation impulse" framing its urgency.

Infrastructure Degrades as Drawdown Accelerates

A Government Accountability Office report from early July, reported by S&P Global, found the SPR could draw down oil at only about 61 percent of its originally intended rate as of December 2025, while its capacity to accept returning crude had fallen to 56 percent of design specifications. A separate May GAO report found that more than a quarter of the reserve's oil was unavailable for drawdown because of construction and underground cavern outages. Rapidan Energy estimated this could mean at least 103 million barrels of current inventory are not immediately deployable.

The reserve is not just smaller. It is slower on the way out and slower on the way back in — the falsifiable version of the analyst's warning.

Comparisons to 2022 and the Refill Question

The largest single SPR release on record remains President Biden's 180-million-barrel release starting in early 2022, in response to Russia's invasion of Ukraine. The current mobilization is comparable in cumulative scale, though the reporting stops short of naming it the biggest ever.

Once the full release ordered by Trump is completed, government stocks are expected to fall to around 243 million barrels — below the statutory minimum of 252.4 million barrels, which would restrict certain limited drawdowns under the Energy Policy and Conservation Act.

David Goldwyn, former State Department special envoy for international energy affairs under President Obama, told CNBC: "I'm not worried about the stability of the reserve or our ability to do another drawdown if we needed to." Between today's level and DOE's 70-million-barrel operational floor, there is still room before a genuine crisis point.

The open question is how much further Washington can push before refilling becomes urgent. With no cease-fire in sight, the answer will show up in the next weekly SPR print and in whether DOE starts writing repayment premiums even higher than 28 percent.

This article is for informational purposes only and does not constitute investment advice.