Energy and Economics - 30 May 2026
TL;DR - Last Reviewed: 30 May 2026
- The Strait of Hormuz carries roughly one fifth of the world's oil and liquefied natural gas
- Iran closed the strait to foreign shipping in late February 2026 following US and Israeli airstrikes
- Oil prices fell sharply when an initial ceasefire was announced in April 2026
- Full reopening is contingent on a finalised US-Iran ceasefire deal
- Middle East energy risks were explicitly cited by the Bank of England in its April 2026 rate decision
Why the Strait Matters
The Strait of Hormuz is a narrow waterway between Iran and Oman at the mouth of the Persian Gulf. It is the world's most significant oil transit chokepoint, with roughly one fifth of global oil supply and liquefied natural gas passing through it. Countries and regions that depend on Gulf oil exports - including Europe and the UK - are directly affected by any restriction on shipping through the strait. When the strait is fully open, tanker traffic moves freely and oil supply remains broadly stable. When it is blocked or disrupted, wholesale energy prices spike globally.
What Happened in February 2026
Iran closed the Strait of Hormuz to foreign shipping in late February 2026 following the launch of US and Israeli airstrikes on Iranian military targets. Iranian Revolutionary Guard Corps vessels transmitted warnings to passing ships that no vessel was permitted to transit. The British Royal Navy noted the closure was not legally binding, but that safety could not be guaranteed. Several ships turned back or stayed in port. From 13 April, the US imposed a counter-blockade targeting ships seeking to access Iranian ports.
The Impact on Oil Prices and UK Energy Bills
When an initial two-week ceasefire was agreed in April 2026, Brent crude fell by roughly 16% in a single day, dropping below $100 per barrel. This illustrated the extent to which the strait disruption had been pricing a risk premium into global oil markets. Wholesale gas prices, which are linked to global oil market dynamics, had risen significantly during the period of disruption. The Bank of England, in its April 2026 Monetary Policy Committee decision to hold interest rates, explicitly cited the war in the Middle East and its energy price implications as a key upside inflation risk. UK household energy bills are set by Ofgem on a quarterly basis using wholesale gas prices as a key input; sustained wholesale spikes directly affect what households pay.
What Full Reopening Would Mean
A finalised and durable US-Iran deal that resulted in the full removal of sea mines and the restoration of normal shipping volumes through the strait would be expected to reduce the risk premium in global oil prices significantly. The degree of any price reduction would depend on OPEC+ production decisions, spare capacity levels, and whether Iran's oil production infrastructure - which sustained damage during the conflict - can return to pre-war output. A sustained fall in wholesale energy prices would put downward pressure on UK household energy bills from the October 2026 Ofgem cap review onward, and would support the case for Bank of England rate cuts.
