Biggest Oil Shock in History: The IEA Just Said What Nobody Wanted to Hear

The International Energy Agency has called the Hormuz closure 'the biggest oil shock in history.' Here is what that means, how it compares to 1973, and what happens to European consumers.

When the International Energy Agency uses the phrase 'the biggest oil shock in history,' it is not engaging in rhetorical hyperbole for press release impact. The IEA issues formal communications with precision calibrated to their technical credibility, and choosing to characterize the Hormuz closure as the largest supply disruption in recorded energy market history is a specific analytical claim with specific quantitative backing.

The comparison to the 1973 Arab oil embargo — the previous holder of the 'largest oil shock' designation in most energy market historiography — is instructive. The 1973 embargo removed approximately five million barrels per day from global supply at its peak, lasting approximately five months and producing a fourfold increase in oil prices. The current Hormuz closure is, by IEA calculation, removing up to 20 million barrels per day — four times the 1973 disruption's peak volume — from global supply. The price response has been proportionally more constrained than 1973's fourfold increase, partly because strategic reserve releases and demand destruction have cushioned the impact, but Brent crude has still risen more than 50 percent since the war began five weeks ago.

The 20 million barrel figure requires some unpacking. Not all of the Hormuz closure's impact is on crude oil production. Some of it is on LNG flows, refined products, and the shipping costs for everything that transits or used to transit through the strait. The total energy equivalent impact is larger than the crude oil figure alone suggests.

For European households, the IEA's 'biggest oil shock in history' label has practical translation. European gas storage is at multi-year lows entering the refilling season. Diesel at record prices is flowing through into every supply chain that moves goods on roads. Electricity spot prices have risen sharply in countries where gas-fired generation sets the marginal price. The combination is producing an inflation surge that central bank governors are describing, with their characteristic understatement, as 'challenging.'

The IEA's assessment also implicitly critiques the adequacy of the strategic reserve release that Western governments have activated. The reserves exist and are being used. They are not large enough to offset a disruption of this magnitude for more than a few months. After that, market prices must do the rationing work that physical allocation did in 1973.