Brent crude climbed above $100 a barrel after shipping through the Strait of Hormuz slowed to a trickle, a disruption the IEA has called the largest in the oil market's history. Around 20 million barrels a day normally pass the strait, but attacks on vessels have sharply cut that flow, lifting prices from about $65 before the recent escalation. The United States and IEA partners have released 400 million barrels of reserves over 120 days, equal to roughly 3 million barrels a day, but that still leaves a large shortfall. The gap is forcing producers and policymakers into hard choices about reopening routes, restoring output and containing price-driven inflationary pressure.

The Iran war has reversed a long era of comparatively steady oil transit through the Strait of Hormuz. Edward Fishman, senior fellow and director of the Maurice R. Greenberg Center for Geoeconomic Studies at the Council on Foreign Relations, said attacks on commercial ships have altered the global shipping industry's risk calculus. He noted that the strait hasn't been physically closed by a formal blockade. But low-cost weapons and drone strikes on more than a dozen vessels have been enough to choke flows.

Immediate market shock

Before the conflict, roughly 20 million barrels of oil and petroleum products moved daily through Hormuz. Brad W. Setser, Whitney Shepardson senior fellow at the Council on Foreign Relations, wrote that the recent slowdown amounts to the IEA's largest supply disruption on record. Brent moved from about $65 a barrel at the start of the tensions to north of $100, reflecting both lost supply and a spike in perceived risk.

Insurance costs, rerouting and delays are already raising the cost of moving oil. And some producers have simply shut wells because they have nowhere to put crude. Rory Johnston of Commodity Context estimated that up to nine million barrels a day may be shut in, meaning production has been paused because storage and transport options have evaporated.

Cyclical pressures versus structural shifts

Some effects are cyclical. Short-term price spikes hit consumers and businesses quickly. Higher fuel bills feed inflation. That raises the odds of earlier monetary tightening or slower rate cuts by central banks. Governments face tougher fiscal choices as they consider subsidies, strategic sales or tax changes to blunt consumer pain.

Other effects look structural. The disruption is exposing chokepoints in global energy logistics. Fishman highlighted how a small number of attacks can force the wider industry to reroute or halt traffic. That changes investment incentives for shipping, ports and insurance.

Mastheads

It also alters the calculus for long-term supply chains.

Saudi Arabia can move some oil around the problem by using an alternative pipeline. That capacity is limited. Setser pointed out that even with such reroutes, the shortfall could be close to 15 million barrels a day compared with pre-war flows. Strategic reserve releases can't make up that scale of disruption over time.

The US and partners coordinated a record release of 400 million barrels over 120 days.

That works out at just over three million barrels a day. Setser noted that the release falls far short of the volumes that have stopped transiting Hormuz. The gap forces policymakers into two unattractive choices, Fishman argued: persuade Tehran to allow shipping to resume, which would require concessions, or accept escalation that could widen military involvement.

Those choices matter for markets. If traffic resumes, prices could stabilise. If not, the deficit will remain structural until shipping routes or storage capacity are rebuilt. Either way, producers and traders must reassess where oil will flow and how much spare capacity truly exists.

Wider economic knock‑on

Beyond the oil market, the disruption sends ripple effects through trade and inflation. Higher shipping costs and longer voyage times affect commodity and manufacturing supply chains. Energy-intensive industries face squeezed margins. Consumers in importing countries shoulder higher pump prices and utility bills.

Fiscal strains may follow. Governments with weak buffers could see public finances pressured by subsidy spending or slower growth. Central banks will weigh those demands against inflation targets. The immediate market response of higher prices thus feeds both cyclical policy decisions and longer-term structural adjustments in supply, storage and transport.

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The IEA and partners released 400 million barrels of strategic reserves over 120 days.

This article was created with AI assistance.