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Strategic reserves: the state of the buffer before round two

The US Strategic Petroleum Reserve has fallen to 316.5 million barrels, its lowest since 1983, after the record 400-million-barrel release coordinated by the IEA in March. The blockade reimposed on 14 July reopens the supply shock with dented shock absorbers. A quantified inventory of the remaining cushions, of the only buffer still full, China's, and of the oil market's real safety margins.

10 min read#oil#energy#macro#geopolitics#commodities#iran
dated revision: July 17, 2026French originalprimary sourcesno tracker

A strategic reserve is only good once per crisis. The one for 2026’s first shock has been used: a record 400-million-barrel release coordinated by the International Energy Agency in March, massive American destocking, Japanese and Korean reserves drawn upon. Four months later, the ceasefire has shattered, the blockade of Iranian ports was reimposed on 14 July, and Gulf exports have fallen back below half their pre-war level. Round two of the supply shock therefore opens with a question few commentaries quantify: how much is left in the emergency tanks, and whose are they?

The US SPR at its lowest since 1983

The starkest figure comes from the EIA’s weekly series: the US Strategic Petroleum Reserve (SPR) fell to 316.5 million barrels in the week of 10 July 2026, after 319.5 million the week before. You have to go back to April 1983, at 317.45 million, to find less, as Mansfield Energy notes. Against its design capacity of about 714 million, the reserve is 56 percent empty, per Rigzone.

The origin of the drawdown is known: on 11 March, in response to the price surge triggered by the strikes on Iran, Energy Secretary Chris Wright announced the release of 172 million barrels over about 120 days, a programme ending precisely in these days, as Al Jazeera recalls. Washington promises a refill of about 200 million barrels within a year, presented as 20% more than the volume drawn and at no cost to the taxpayer. The promise has two documented limits: the same Energy Secretary estimated that a full refill would cost on the order of $20 billion and take years, and no one refills a reserve while the barrel is surging, except to worsen the surge. The refill timetable belongs to the optimistic scenario, not to the present situation.

The SPR scraping its historic floor Crude stocks in the US Strategic Petroleum Reserve, in millions of barrels. Design capacity ~714 10 July 2026 316.5 April 1983 floor 317.45 Release of 172 million barrels over ~120 days, announced 11 March 2026; the reserve is 56% empty. Sources: EIA (weekly series WCSSTUS1), Mansfield Energy, Rigzone, DOE.
The American reserve has slipped below its 1983 floor. The March destocking programme ends at the precise moment the shock restarts. Sources: EIA, Rigzone, DOE.

The largest release in IEA history

The international layer was tapped at the same time. On 11 March, the 32 member countries of the IEA unanimously decided to make 400 million barrels of their emergency reserves available, the largest release in the agency’s history, with Asia-Oceania stocks mobilised immediately and those of the Americas and Europe from late March. The order of magnitude dwarfs the precedent: in 2022, the coordinated response to the invasion of Ukraine had mobilised about 240 million barrels in two waves.

The base this release drew from was documented before the crisis: about 1.25 billion barrels of government stocks in the OECD, plus 600 million of industry stocks held under public obligation, figures we cited as early as our April situation report. A rough subtraction, which public data does not allow refining to the week, therefore puts remaining OECD government stocks around 850 million barrels, before even counting the needs of round two. The rule underpinning the system, the 90-days-of-net-imports obligation, remains met by most members, but it measures peacetime coverage: it says nothing about the ability to absorb two major shocks in the same year.

A shot twice the size of 2022, from a finite base Coordinated IEA releases and OECD stock base, in millions of barrels. Ukraine, 2022 (two waves) ~240 Iran, March 2026 400 (record) OECD government stocks before the crisis ~1,250 Remaining order of magnitude (estimate) ~850 Sources: IEA (11 March 2026 releases and 2022 history), CRS. Remainder: l0g calculation, not refined to the week.
The March response committed nearly a third of the OECD's government stocks in a single decision. The remaining base is an estimate, not a published figure. Sources: IEA, CRS, l0g calculation.

The buffer still full is Chinese

There is one large reservoir that round one barely touched, and it does not belong to the IEA system. China’s onshore crude stocks were estimated at about 1.24 billion barrels in the spring, most likely the largest reserve in the world, complemented by some 166 million barrels of Iranian crude in floating storage in Asian waters. We documented the strategy that goes with it in the Chinese inventory capping prices: Beijing buys at a discount when the barrel falls, stops buying when it surges, and lives off its tanks during crises.

The nuance is decisive for what comes next: this buffer is real, but it is private in the geopolitical sense. China takes part in no coordinated mechanism, publishes no levels, and its destocking serves its own import bill, not the world’s balance. Its stabilising effect exists, we measured it in round one, but it operates by withdrawing demand, not by supplying the open market. In other words, the biggest remaining cushion cushions China first, the world by ricochet, and no one controls its trigger except Beijing.

Round two starts dented

The calendar is the cruel fact of this file. The American 120-day programme ends in mid-July, at the exact moment the memorandum’s clocks break: blockade reimposed on 14 July, strikes expanded, and, per the Goldman Sachs estimate reported by Reuters, Gulf exports back below 50% of their pre-war level in the week to 15 July, after recovering above 80% during the truce. The first shock found full reserves and a market confident in their use. The second finds an SPR below its 1983 floor, an OECD base cut by a third, and governments that now know the political cost of destocking: whoever fires their last rounds tells the market so, and the market prices the nakedness that follows.

This is the most important mechanism to grasp: a strategic reserve works as much through its level as through its existence. While it is full, its mere presence calms risk premiums. Once dented, each barrel released reassures less and each barrel remaining counts double. Emergency stocks are a non-linear shock absorber, and the non-linear zone is precisely the one being entered.

The shock absorbers that remain

An honest inventory does not stop at the tanks, because the market of 2026 has other cushions, and they are substantial. The first is OPEC+ spare production capacity: the spring quota increases and the 188,000-barrel-a-day adjustment confirmed for August, with the explicit option to accelerate, pause or reverse, make up a tap that 2022 did not have at this scale. The second is demand: soft, with a China in retreat that had already cut its imports by 20% year on year at the worst of the first shock. The third is American: the United States being a net exporter, the 90-day rule is met there even with a low SPR, and the country produces at record levels; the insurance function of its reserve has changed in nature since 1983, which puts the historical comparison brandished by both sides into perspective.

These shock absorbers nonetheless share one trait that sets them apart from stocks: they produce barrels over time, not immediately, and they assume the infrastructure works. Saudi spare capacity is worthless if the terminals are under fire or if the strait no longer lets tankers and carriers through. The stock, by contrast, is already ashore, on the right side of the chokepoints. It was spent first for that precise reason, and for the same reason its current level remains the true measure of the safety margin.

The gauges to watch

Five gauges track the state of the buffer continuously. The SPR weekly series published by the EIA, every Wednesday, to check whether the destocking stops or resumes. The IEA’s follow-up statements on the collective action, which will say whether a second release is contemplated and how deep. Signals of Chinese destocking or restocking, readable in imports and satellite tank tracking. The OPEC+ decisions of August, the first test of the acceleration option. And the stocks at Cushing, already scraping their operating floor, which measure physical tension where the American price is set.

Round one of 2026 proved that strategic reserves work: they cushioned the largest supply shock in the history of the oil market. It also consumed a large share of their power. If round two stays short, the remaining cushions will probably suffice, helped by OPEC+ and soft demand. If it settles in, the world will discover the difference between a market that fears running out of oil and a market that knows it has already used its insurance. That is not the same price for a barrel.

Sources

This article is journalistic analysis and does not constitute investment advice. Remaining OECD stock levels are calculated orders of magnitude, flagged as such. Data cited as of the date of its sources.

This analysis is not investment advice.

// cite this analysis

l0g, “Strategic reserves: the state of the buffer before round two”, l0g.fr, published July 17, 2026, updated July 17, 2026, https://l0g.fr/en/analysis/strategic-petroleum-reserves-buffer-round-two/

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