July Energy Bills Could Rise £332 as Iran War Hits the Price Cap

Cornwall Insight has revised its July 2026 price cap projection sharply upward. The new estimate: £1,973 for a typical dual-fuel household — up from a pre-war forecast of £1,807 and a substantial reversal of the £117 reduction arriving in April.

That £332 increase would represent the highest price cap since July 2023 at the height of the post-Ukraine energy crisis. Dr Craig Lowrey of Cornwall Insight noted that even if wholesale prices quickly return to pre-conflict levels, some of the recent volatility will be baked into the July cap due to how Ofgem's methodology works.

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 the conflict started, see our piece on 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 — is announced 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 — assuming an 800W system generating 650kWh annually. At the £1,973 cap level, payback on a £499 kit shortens to under two and a half years. 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.