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Britain's energy price-cap forecast to rise about 10%, Cornwall Insight says

Published by Global Banking & Finance Review

Posted on March 4, 2026

2 min read

· Last updated: April 2, 2026

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Britain's energy price-cap forecast to rise about 10%, Cornwall Insight says
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LONDON, March 4 (Reuters) - Britain's domestic energy price cap is forecast to rise by about 10% in July in response to a wholesale surge in prices tied to the war in Iran, analysts at Cornwall

Britain's energy price-cap forecast to rise about 10%, Cornwall Insight says

Forecasted Energy Price Cap Increase and Its Implications

LONDON, March 4 (Reuters) - Britain's domestic energy price cap is forecast to rise by about 10% in July in response to a surge in wholesale prices tied to the war in Iran, analysts at Cornwall Insight said on Wednesday.

Impact on Government and Households

A rise would be unwelcome news for Prime Minister Keir Starmer's Labour government, which is under pressure to meet a pledge to curb household energy costs.

Policy Changes and Financial Consequences

It would also wipe out the savings made from the decision to scrap a policy that forces energy suppliers to pay for measures like insulation and new heating systems for low-income households and move some levies onto general taxation.

Factors Influencing the Price Cap

Wholesale energy prices are the largest single factor contributing to British energy regulator Ofgem's domestic price cap, which is set on a quarterly basis using a formula that also reflects suppliers' network costs and environmental and social levies.

International Market Disruptions

Disruptions to shipping in the Middle East and a halt to liquefied natural gas exports from Qatar, one of the world's largest gas exporters, has led to a surge in international gas prices. Gas prices in Britain are currently more than 70% higher than last week.

Expert Commentary

"This latest forecast puts the role of wholesale markets firmly back in the spotlight and illustrates how exposed UK households remain to international market movements," said Craig Lowrey, principal consultant at Cornwall Insight.

Future Price Cap Predictions

Cornwall Insight forecasts Ofgem's price cap will rise in July to 1,801 pounds ($2,409) a year for typical use, from 1,641 pounds in April.

Government Response

A spokesperson for Britain's Department for Energy Security and Net Zero said using short-term price fluctuations to predict coming prices was not reliable and the only way to protect consumers from price spikes is to curb fossil fuel use.

Upcoming Ofgem Announcement

Ofgem is expected to publish the next price cap level by May 27, and Lowrey said the forecast could change before then if wholesale prices fall or rise further.

Additional Information

($1 = 0.7476 pounds)

(Reporting by Susanna Twidale. Editing by Paul Simao and Mark Potter)

Key Takeaways

  • Cornwall Insight projects the July‑September price cap will rise 10% to £1,801 due to global gas market shocks linked to the Iran conflict (theguardian.com).
  • Wholesale gas prices have spiked—rising up to 93% since the conflict began—and disruptions via the Strait of Hormuz and Qatar’s LNG halt are central drivers (uk.finance.yahoo.com).
  • The projected rise erodes April’s 7% drop in bills to £1,641, complicates the Labour government’s pledge to ease household costs, and may erase welfare gains for low‑income families (linkedin.com)

References

Frequently Asked Questions

Why is the UK energy price cap expected to increase in July?
The cap is likely to rise due to a surge in wholesale energy prices linked to the war in Iran and disruptions in global gas supply.
Who sets Britain's energy price cap and how often is it updated?
The British energy regulator Ofgem sets the cap, updating it quarterly based on wholesale prices and other factors.
What factors contribute to the energy price cap calculation?
The cap reflects wholesale energy prices, suppliers' network costs, and environmental and social levies.
When will the new energy price cap level be published?
Ofgem is expected to publish the next price cap level by May 27.

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