TL;DR
Ofgem announces the July to September 2026 energy price cap on 27 May 2026. Sainsbury's Energy's 6 May 2026 prediction puts the new cap at £1,852 for a typical dual-fuel direct debit household, up £211 (13%) from the current £1,641. The increase, if confirmed, would be the first cap rise in five quarters. Wholesale gas prices feeding into the calculation through the February to May assessment period are the primary driver.
The next quarterly energy price cap will be announced by Ofgem on 27 May 2026 and will apply for the three months from 1 July to 30 September 2026. The current cap, set on 25 February 2026 and running from 1 April to 30 June 2026, stands at £1,641 per year for a typical dual-fuel household paying by direct debit. That level was 7% lower than the previous quarter.
As of 6 May 2026, Sainsbury's Energy is forecasting a July 2026 cap of £1,852, an increase of £211 (13%) on the current level. Cornwall Insight and other independent forecasters were broadly aligned with this direction in their late-April updates, with the central forecast clustering between £1,820 and £1,900.
What is driving the forecast increase
The energy price cap is built from several cost components. Wholesale gas and electricity costs account for around 40% of a typical bill, network charges around 25%, policy costs around 10%, supplier operating costs around 15%, and a regulated supplier margin makes up the remainder. Wholesale gas prices are the most volatile component and drive most quarterly changes.
The July 2026 cap is calculated using wholesale prices from the assessment period running from approximately mid-February to mid-May 2026. European wholesale gas prices rose sharply through March 2026 as Middle East tensions affected supply expectations, and although prices have partially retraced, they remain well above the levels assumed in the April 2026 cap calculation.
The April 2026 cap also benefited from a one-off £150 reduction tied to government changes to the Energy Company Obligation (ECO) levy and the movement of certain green levies to general taxation. That cost reduction was a step change rather than a recurring decrease, so it does not provide further downward pressure on the July cap.
How the cap affects different household sizes
The published cap of £1,641 is the figure for a typical dual-fuel household using 2,700 kWh of electricity and 11,500 kWh of gas per year, paying by direct debit. The actual bill paid depends on usage, region, and payment method. If Sainsbury's £1,852 forecast is confirmed, the impact varies by household.
A low-use single-person household paying by direct debit might see an annual increase of roughly £130 to £160. A typical two-adult household at the headline 2,700 kWh / 11,500 kWh consumption level would face the headline £211 annual increase. A larger family with above-average use could see annual increases of £270 to £350. Standard credit customers and prepayment customers pay slightly different rates due to different cost-to-serve assumptions in Ofgem's methodology.
Fixed deals versus the cap
Fixed-rate tariffs are priced off forward wholesale markets and the supplier's hedging position rather than the cap itself. Through April and early May 2026, the cheapest fixed deals available across the major suppliers were priced between 1% and 6% below the current £1,641 cap, depending on length of fix and exit fee structure.
If the July cap rises to £1,852 as Sainsbury's forecasts, households on fixes signed in March or April 2026 below the £1,641 level would see locked-in protection against the rise. Households on the standard variable tariff (SVT) at the cap level have no such protection. As of 12 May 2026, several suppliers had paused new fixed-rate offerings or repriced them upwards in anticipation of the higher cap announcement.
What households can do before 27 May
The 15-day window before the announcement is the practical window for households to compare available fixed deals against the current cap. The decision to fix is a hedge against further volatility, not a guaranteed saving, and the right answer depends on usage, expected residence, and exit fee tolerance.
For households eligible, the Warm Home Discount Scheme for 2026/27 provides a £150 credit to qualifying low-income and pensioner households. Eligibility criteria are being expanded for the 2026/27 scheme year, and applications open through energy suppliers and via GOV.UK. The discount is applied automatically for many recipients but some still need to claim.
Northern Ireland is not covered by the cap
The Ofgem price cap applies to households in England, Scotland, and Wales. Energy prices in Northern Ireland are regulated separately by the Utility Regulator. Households in Northern Ireland are not directly affected by Ofgem cap announcements, though wholesale market trends affect both regimes.
Editorial disclaimer: Forecast figures cited in this article are independent predictions and not Ofgem confirmed levels. The actual July 2026 cap will be announced by Ofgem on 27 May 2026 and may differ from these forecasts. Fixed-rate tariff decisions are personal financial choices that depend on individual circumstances.
Frequently asked questions
When does the July 2026 energy price cap come into effect?
The Q3 2026 cap applies from 1 July to 30 September 2026 and will be announced by Ofgem on 27 May 2026.
What is the current energy price cap?
The current cap, applying from 1 April to 30 June 2026, is £1,641 per year for a typical dual-fuel household paying by direct debit.
Is the £1,852 figure confirmed?
No. £1,852 is the prediction published by Sainsbury's Energy on 6 May 2026 based on its modelling of wholesale prices and other cost components. The actual cap will be confirmed by Ofgem on 27 May 2026 and may be higher or lower.
How is the cap calculated?
Ofgem builds the cap from wholesale energy costs, network and infrastructure charges, policy costs, supplier operating costs, and a regulated profit margin. The wholesale component reflects market prices across an assessment period of roughly three months before the announcement.
Should I fix my energy tariff before 27 May?
Fixing protects against further increases but typically locks the household in for the fixed period with an exit fee. The decision depends on the household's risk tolerance and the relative price of the available fix versus the current cap. Anyone considering a fix should compare deals using the Citizens Advice price comparison tool or contact suppliers directly.
How we verified
This article draws on Ofgem's official cap announcements (25 February 2026 for Q2 2026), Sainsbury's Energy public price cap predictions page updated 6 May 2026, the House of Commons Library briefing CBP-9714 (April 2026), and the Department for Energy Security and Net Zero policy announcements. Forecast methodology references Cornwall Insight published commentary. Q2 2026 unit rates cited (24.67p/kWh electricity, 5.74p/kWh gas) and standing charges (57.21p/day electricity, 29.1p/day gas) are Ofgem published figures.
