Cornwall Insight has revised its July 2026 price cap projection sharply upward. The new estimate: £1,973 for a typical dual-fuel household. That's £332 more than the cap arriving in April, and the highest the cap has been since the post-Ukraine peak. The direction of travel is not ambiguous.
Dr Craig Lowrey of Cornwall Insight noted that even if wholesale prices quickly return to pre-conflict levels, some of the recent volatility is now baked into the July calculation. This is how Ofgem's methodology works — it captures a rolling window of wholesale prices, so a spike always feeds through regardless of what happens next. The damage, in other words, is already done.
Why the Iran war is driving UK energy prices
Wholesale gas prices have roughly doubled since the US strikes on Iranian nuclear facilities in late February 2026. Iranian threats to close the Strait of Hormuz — through which approximately 20% of global LNG trade passes — have kept markets under acute stress. A strike on a Qatari gas hub caused UK prices to surge almost a quarter in a single session. The UK imports around 22% of its gas from LNG sources, making it more exposed to Strait of Hormuz risk than pipeline-connected European neighbours. For background on how this started, see the night gas prices spiked.
Ofgem will not confirm the July cap until 27 May 2026. The direction is already clear. The only variables are the final magnitude and whether any policy intervention — targeted support payments, emergency tariff caps — arrives before the July reset date.
What this means for plug-in solar
Every £100 increase in the annual price cap improves the financial case for plug-in solar by approximately £15–£20 per year in additional self-consumption savings. At the £1,973 cap level, payback on a £499 kit shortens to under two and a half years. That's not a complicated investment decision. Use our payback calculator to run the numbers for your household. To see which kits are available now, visit our best plug-in solar kits guide.
