When the ceasefire between the United States and Iran was announced on 8 April 2026, financial markets responded with relief — the FTSE 100 jumped more than three percent, oil prices pulled back from their peak and airline stocks staged a partial recovery. But Brent crude remained above $100 per barrel a week after the announcement. That sustained elevation tells you something important about what energy markets actually think: the ceasefire paused a crisis; it did not resolve the underlying tensions that caused it.
The structural supply equation in global oil markets has changed permanently as a result of the conflict. The Strait of Hormuz closure, even though temporary, demonstrated to every government and every energy company in the world what most had known in theory but few had fully priced into their planning: that a single geographical chokepoint carries roughly 20 percent of global oil supply, and that it can be closed by a determined state actor in a period of hours. That vulnerability does not disappear because the guns have stopped.
The investment response to this realisation is already underway. Alternative pipeline routes, additional strategic petroleum reserve holdings, accelerated development of non-Gulf oil fields and the fastest possible expansion of renewable electricity to reduce oil dependency — all of these are receiving increased investment commitments as a direct consequence of the conflict. The geopolitical insurance premium embedded in energy investment decisions has risen permanently.
For oil importers including the United Kingdom, the medium-term implication is clear: the energy security rationale for domestic renewable expansion has been dramatically strengthened. Every unit of electricity generated from offshore wind or solar is a unit that does not need to be generated from gas turbines running on imported liquefied natural gas or indirectly from oil. That calculation was already compelling on cost grounds; it is now compelling on security grounds simultaneously.
