For the first time, the 'Iran war premium' a term long confined to commodity trading desks has directly translated into higher energy costs for British households. Data released this morning by the Department for Energy Security and Net Zero confirms that the average dual-fuel bill has risen by £18.50 per month since the escalation of hostilities in the Strait of Hormuz three weeks ago. The surcharge is a physical consequence of geopolitical risk priced into wholesale gas and electricity markets, now passed through to consumers.
The mechanism is straightforward. The Strait of Hormuz handles 20% of global liquefied natural gas (LNG) shipments. With Iranian fast-attack craft harassing commercial vessels and a US carrier strike group on station, insurers have tripled war risk premiums for transiting tankers. This adds roughly $0.45 per million British thermal units (MMBtu) to LNG delivered to Europe. British gas imports, which now account for 38% of supply, absorbed this increase immediately.
What makes this unprecedented is the pass-through rate. Historically, utilities absorbed such spikes through hedging or profit margins. But the energy price cap introduced by Ofgem, designed to protect consumers from volatility, now ensures that any wholesale cost increase above a threshold is automatically transferred to retail tariffs within two billing cycles. The cap is a blunt instrument; it shields from extreme spikes but also locks in sustained premiums.
The timing compounds a broader crisis. British households already face a 12% year-on-year increase in energy costs due to the phase-out of Russian gas and the weak pound. The average annual bill now stands at £1,923, the highest since records began in 1948. The war premium adds a further £222 per year, pushing low-income families within a whisker of fuel poverty.
Critically, this is not a temporary blip. The International Energy Agency's latest oil market report states that the probability of a sustained disruption in the Gulf has risen to 35%, up from 15% in June. If the conflict escalates to a full blockade, European gas prices could quadruple, according to simulation models from the Oxford Institute for Energy Studies. Britain, with limited gas storage and declining North Sea output, is particularly exposed.
Ironically, the crisis underscores the failure of energy transition policy. Renewables now supply 42% of British electricity, but gas remains the marginal fuel that sets the wholesale price. Until baseload storage and grid interconnectivity are resolved, geopolitics will continue to dictate household energy costs. The government's £150 winter fuel payment for pensioners, announced last week, covers barely half the new premium.
There are no easy fixes. Immediate measures could include a windfall tax on North Sea producers, who benefit directly from higher prices, but such a levy would take months to legislate. Accelerating the rollout of heat pumps and home insulation would reduce demand, but the current rate of installation is too slow to affect this winter. The Treasury is reportedly considering a temporary suspension of green levies on electricity, which add 15% to bills, but that would undercut climate targets.
What is certain is that the era of cheap, geopolitically stable energy is over. The Iran premium is a structural addition to household costs, not a transient shock. For the average family, it means choosing between heating and eating. For the nation, it demands a sober reassessment of energy security. The planet is warming, but so are the geopolitical fault lines that keep our lights on.
