IEA warns oil markets face ‘red zone’ crisis by July as Strait of Hormuz blockade drains global reserves
Strategic petroleum reserves deplete ahead of summer demand surge, with 13 million barrels per day offline and Asia facing critical shortages within eight weeks.
The International Energy Agency projects global oil markets will enter a ‘red zone’ supply crisis in July or August if the Strait of Hormuz remains closed, as strategic petroleum reserves deplete at record rates ahead of peak summer demand.
IEA Executive Director Fatih Birol issued the warning on 21 May, identifying the July-August window as the point where inventory buffers—already drawn at 4.8 million barrels per day between March and April—will no longer cushion markets against the 13 million barrel per day supply shortfall created by the strait’s closure, according to CNBC. The strait, which normally carries approximately 20% of global petroleum liquids, has operated at single-digit tanker traffic since late February.
The arithmetic of depletion
Global oil inventories fell by 250 million barrels over March and April, per the IEA’s May oil market report. That drawdown rate—4 million barrels per day—exceeded all previous quarterly records and occurred despite the IEA’s coordinated release of 400 million barrels from emergency stocks in March, the largest such deployment in the agency’s history. The US Strategic Petroleum Reserve stood at 397.9 million barrels as of 24 April, down to 56% of its 714 million barrel capacity, EIA data shows.
The depletion accelerates as summer approaches. Refinery crude throughputs are forecast to plunge 4.5 million barrels per day in Q2 2026 to 78.7 million bpd, according to the IEA report, as facilities struggle with feedstock access and infrastructure damage. More than 80 energy facilities across the Middle East sustained damage during the conflict; full recovery could require up to two years even after the strait reopens, European Business Magazine reported in April.
“The single most important solution to the Iran war energy shock is a full and unconditional reopening of the strategically vital Strait of Hormuz.”
— Fatih Birol, Executive Director, International Energy Agency
Asia and Africa face critical shortages
The crisis hits import-dependent economies hardest. Japan’s oil inventory levels have fallen to a 10-year seasonal low—down 50% since the conflict began—while India’s reserves are down 10%, according to Fortune. European jet-fuel stocks are depleting rapidly, with analysts projecting critical levels by June. Chevron CFO Eimear Bonner warned that import-dependent countries will “potentially start to face critical shortages as we get into the June-July time-frame.”
Developing Asia and Africa will bear the heaviest burden, Birol noted, as wealthier nations with larger strategic reserves and purchasing power outbid vulnerable economies for scarce supply. Approximately 20% of Gulf state electricity generation depends on oil, creating cascading Energy Security risks beyond transportation fuel. The 13 million barrel per day supply loss exceeds the 2022 Ukraine war disruption by 2.6 times.
The price-reality disconnect
Oil prices have not yet reflected the severity of supply constraints, Birol observed in April. The market’s relative calm stems from two temporary factors: the emergency stock releases that provided short-term supply, and reduced economic activity in conflict-affected regions that dampened demand. Both buffers are now exhausting. The US Energy Information Administration notes that while the strait accounts for roughly 20% of global petroleum flows, alternative pipeline capacity cannot compensate at scale—existing bypass infrastructure can handle only a fraction of the 20.9 million barrels per day that flowed through the chokepoint in the first half of 2025.
Shipping data confirms the blockade’s persistence. Daily tanker transits through the strait collapsed to 3-5 vessels in late April, down from 138 ships per day before the closure, per Fortune. Iran’s foreign minister stated in recent negotiations that “we cannot trust the Americans at all,” demanding precisely defined terms before any reopening—language that signals protracted diplomacy ahead.
The Strait of Hormuz has been a flashpoint since US-Israeli strikes on 28 February killed Iranian Supreme Leader Ali Khamenei. Iran responded by threatening attacks on shipping and deploying sea mines. A 7-8 April ceasefire reduced active hostilities but left the strait functionally closed, with Iran maintaining that all terms must be “clearly defined” before full reopening. The International Crisis Group assesses ongoing escalation risk as negotiations stall.
What to watch
The June-July window represents a diplomatic and logistical inflection point. If the strait remains closed through peak summer demand—when jet fuel consumption surges for travel season and power generation spikes for cooling—rationing becomes probable in vulnerable economies. The IEA has exhausted its headline crisis tool; Birol himself noted the stock release “will not be a solution” without strait reopening. Markets should monitor three indicators: progress in Iran-US negotiations on reopening terms, the rate of continued inventory draws in May and June, and any move toward coordinated demand reduction measures—historically a last resort that signals policy failure. Second-order effects include stagflation pressure as energy costs feed through to broader inflation, and potential shifts in long-term energy security strategy as nations reassess chokepoint dependencies. The timeline is narrow: inventories drain at 4.8 million barrels per day, summer demand arrives in eight weeks, and infrastructure repairs will require two years even in an optimistic reopening scenario.