On 28 February 2026, American and Israeli strikes on Iran began a war whose consequences reached far beyond the battlefield. Iran’s retaliation effectively halted shipping through the Strait of Hormuz, the narrow waterway through which roughly a fifth of the world’s oil and a similar share of its liquefied natural gas normally pass. Within weeks, the International Energy Agency was describing the situation as the largest supply disruption in the history of energy markets.
The numbers were stark. Oil prices swung violently, reaching a post-war peak of about $119 a barrel on 19 March. They fell sharply on hopes of a deal, then rose again when promises to reopen the strait were reversed. By late April, IEA chief Fatih Birol said the world had lost around 13 million barrels per day and called it the biggest energy security threat ever faced. Hundreds of vessels were stranded at both ends of the waterway, and even optimistic analysts warned that normal flows would take months to return after any agreement, because of backed-up tanker traffic, nervous shipowners and damaged infrastructure.
The pain was not shared equally. Nearly 70 per cent of crude passing through the strait is bound for Asia, with China, India, Japan and South Korea the largest recipients. Europe, heavily reliant on imported gas, also felt the squeeze. Net energy producers such as the United States were cushioned, though consumers still faced higher fuel prices. Fertiliser and food supply chains were hit as well, since the same route carries inputs that farms depend on. This is why the International Monetary Fund now links the energy shock directly to higher global inflation.
The macroeconomic assumptions behind official forecasts show how long the disruption may last. The IMF’s October outlook assumes the strait resumes operations around March 2027, with conditions broadly returning to pre-war levels by October 2027. That means roughly a year more of constrained supply, and the Fund warns that renewed escalation could keep energy and food prices elevated.
Yet the crisis has also strengthened one of the strongest forces in the energy system: the argument for electrification and domestic generation. BloombergNEF’s 2026 outlook argues that successive energy shocks could be a boon for the transition, because governments now see imported fossil fuels as a strategic vulnerability, not just an environmental one. The logic is simple. A solar panel or a wind turbine cannot be blockaded once it is installed, and an electric vehicle charged from the domestic grid does not depend on a tanker getting through a chokepoint.
The underlying economics were already moving in that direction. Global investment in the energy transition reached a record $2.3 trillion in 2025, and BloombergNEF projects that solar will become the world’s largest source of electricity generation by 2032, driven by abundant manufacturing capacity and falling prices. The IEA reports that solar is now the leading source of new energy capacity worldwide. Rising pump prices have also lifted interest in electric cars; Chinese manufacturer BYD, which stopped making combustion-only vehicles in 2022, has reported stronger demand as fuel costs climbed.
This does not mean the transition is smooth. Regions move at very different speeds. Countries with weak grids, high borrowing costs or limited access to capital struggle to build quickly, even when renewables are the cheapest option on paper. Batteries and critical minerals bring their own supply-chain risks, concentrated in a small number of countries. And in the short run, some governments have responded to the crisis by burning more coal, drawing down strategic stocks or subsidising fuel, choices that ease household pain but delay structural change.
Energy security is also being redefined. It used to mean securing enough oil and gas, often through alliances, stockpiles and naval protection of shipping lanes. Increasingly it means diversification: a mix of generation types, storage, interconnected grids, efficiency improvements and domestic manufacturing of equipment. Several Asian importers are weighing faster deployment of nuclear power, solar with batteries and electrified transport to reduce exposure.
For businesses and households, the practical consequences are already visible. Airlines and shipping companies are rethinking fuel hedging. Manufacturers are mapping where their energy and feedstock come from. Consumers in many countries are paying more for transport and heating while also seeing new incentives for heat pumps, rooftop solar and electric vehicles.
What comes next depends largely on diplomacy, which is outside the control of energy planners. But the strategic lesson is unlikely to fade, whatever happens at the strait. A single narrow passage showed how much of the world economy rests on fragile logistics. Many governments now appear to have concluded that the surest defence is to need less of what must be shipped through it. If that conclusion hardens into policy, the 2026 crisis may be remembered less as the year energy prices spiked and more as the year the world’s energy map began to be redrawn.
