The financial markets processed the news of the Iran strike with the speed they process everything: within minutes, Brent crude was up six percent, natural gas futures were up nine, and the insurance premiums for tankers transiting the Strait of Hormuz had doubled.

By the end of the week, the oil price had retreated somewhat as analysts concluded that Iranian production capacity had not been directly targeted in the initial strikes. The gas price had not retreated. And the insurance premium had not retreated either, because insurance does not price on optimistic scenarios.

This is how a military conflict in the Persian Gulf becomes an economic event in Australia, Germany, Japan, and South Korea before the first week is out.

The Hormuz Chokepoint

The Strait of Hormuz, the narrow channel between Iran and Oman through which approximately twenty percent of the world's traded oil and seventeen percent of its liquefied natural gas passes, is the most consequential chokepoint in the global energy system.

Iran has repeatedly threatened to close Hormuz in response to military action against it. The threat has historically been assessed as a bluff — the economic costs of closure to Iran itself, which depends on Hormuz for its own energy exports, are severe. But the calculation changes when Iranian leadership is operating under existential threat. A government fighting for its survival may be willing to accept costs that a government in stable conditions would not.

The current situation is not a full Hormuz closure. Iranian forces have, as of this writing, conducted harassment operations against tanker traffic — speed boat approaches, communications jamming, warning shots that fall short of the legal threshold of piracy but raise the operational risk and cost of transit significantly. Lloyd's of London has designated the Gulf as a high-risk zone for marine insurance purposes. The practical effect is a substantial increase in shipping costs for every vessel transiting the strait.

Australia's Warning

The Australian Energy Market Operator issued a warning that energy bills could surge as the Iran conflict drives up global gas prices. The comparison cited was 2022, when the Russian invasion of Ukraine sent European gas prices to historic highs and Australian electricity prices followed, rising by more than forty percent in twelve months.

Australia's vulnerability to this mechanism is partly paradoxical: Australia is one of the world's largest exporters of LNG. But domestic gas pricing in Australia is linked to international spot markets, which means that when international prices rise, Australian consumers pay more for gas that is largely produced in their own country.

The government has the tools to decouple domestic prices from international markets — price caps, domestic reservation requirements — and has deployed them in the past. The political question is whether and when to do so again, and the answer depends on how long the current price elevation lasts.

Germany's Second Test

For Germany, the Iran energy shock arrives as the country is still rebuilding the energy security that was destroyed by its dependence on Russian gas. The post-Ukraine energy transition — the emergency build-out of LNG import terminals, the acceleration of renewable deployment, the painful restructuring of energy-intensive industry — was not yet complete when the Persian Gulf began generating its own supply shock.

German industry, already under competitive pressure from lower energy costs in the United States and China, is now facing a potential third consecutive year of elevated energy prices. The political consequences for a government already struggling with the structural challenges of the German economy are difficult to calculate.

The Price of Oil Politics

The deeper lesson of the Iran energy shock is one that has been available for fifty years and is still, apparently, difficult to act on: that a global economy organised around the extraction and combustion of fossil fuels from politically unstable regions is permanently vulnerable to exactly this kind of disruption.

The clean energy transition, moving faster than its critics acknowledge and slower than its proponents require, is the only structural solution to this vulnerability. Every year it is delayed is another year in which a military decision in the Persian Gulf can send Australian power bills up forty percent and German factory costs to a level that makes production uneconomical.

The energy shock is not just the consequence of a war. It is the cost of a dependence that was always a choice.