Energy cap set for sharpest January jump in four years as cold snap meets rising gas costs

Britons face their steepest winter energy price increase since 2021, according to a new forecast, with the typical annual household bill climbing by £276 in January. The warning from consultancy Cornwall Insight, shared with the BBC, points to a 16% rise in the Ofgem price cap at the moment of year when heating demand peaks and many families are still working off Christmas spending.

About 20 million homes in England, Wales and Scotland sit on variable tariffs linked to the regulator's cap, which limits the maximum price suppliers can charge for each unit of gas and electricity. Customers on those rates will be the first to absorb any increase, and Cornwall Insight expects them to bear the full weight of a forecasted jump.

The immediate change arrives this Thursday, when the cap rises 4% — roughly £60 a year, or about £5 a month. For a typical home using both fuels and paying by direct debit, that lifts the cap to £1,723 a year if sustained over 12 months. The government will cushion that slightly increase: its VAT reduction on domestic energy is worth the equivalent of around £45 annually, meaning the rise would have been steeper without it.

The January picture is far harsher. Cornwall Insight's modelling indicates the cap will jump to £1,999 for the typical dual-fuel direct debit household — an increase of £276 on the current level, and the largest single rise in four years.

Principal consultant Craig Lowrey said January is the worst possible month for such a change, with freezing weather coinciding with household budgets still recovering from the festive period. He warned that the increase would land hardest on customers already managing tight margins.

The drivers are supply-side rather than domestic. Cornwall Insight attributes the rise to disruption to gas supplies linked to conflict in the Middle East, which has left storage levels across Europe unusually low heading into winter. Rebuilding depleted reserves to normal levels could keep wholesale prices elevated well past the end of the heating season, extending the pain into spring and beyond rather than producing a short spike.

Forecasts also point to a January increase as close to unavoidable. The window used to set the cap is already half over, so even if diplomatic efforts reduce regional tensions or international energy prices ease, there is little time for that to feed into the calculation. With no clear sign of a truce or of falling wholesale costs, Lowrey described a rise as all but certain.

The official figure is not due until late November, when Ofgem publishes its decision, and the regulator has not yet confirmed the consultancy's numbers. Even so, Cornwall Insight has a strong record of accuracy in this area and is widely trusted across the energy industry and Westminster. Several suppliers have published broadly similar projections, reinforcing the expectation of a significant step up.

The wider price history gives some perspective. The cap peaked at £3,582 in July 2023 during the energy crisis, then fell steeply to a low of £1,414 by July 2024. Since then it has oscillated in a relatively narrow band, generally between about £1,543 and £1,655 through late 2024 and mid-2025, before edging up again in 2026. Against that backdrop, a move to £1,999 would represent the highest level in the series since it began in April 2022, though the January figure is calculated using updated typical household consumption values, which account for part of the apparent jump.

For households already under pressure, the timing could prove punishing. Aaron Richards, who lives in Maidenhead, said he is cutting back on takeaways, working additional overtime and trying to budget more carefully simply to keep pace. He also drives a diesel car and is paying record prices at the pumps to get to and from work.

Richards said he knows people who cannot afford to heat their homes properly, and argued that keeping a house warm and putting food on the table should not be treated as luxuries. "I just feel like everything's going up," he said, adding that somebody needs to step in.

The squeeze is compounded by the build-up of household debt. Ofgem data shows customers owe more than £5bn in unpaid bills and charges to suppliers, a legacy of several years of high prices. The regulator has a proposed debt relief scheme on the table, but campaigners have repeatedly pressed it to move ahead and urged the government to fund it.

Adam Scorer, chief executive of the fuel poverty charity National Energy Action, called the situation unsustainable for households and for the energy market as a whole. He said the Budget must provide additional, targeted assistance for the households most at risk this winter, while also tackling accumulated energy debt and improving the least energy-efficient homes.

Industry figures suggest the pressure will be widely shared. Simone Rossi, chief executive of supplier EDF, said the UK is "walking into a second energy crisis" and called for the VAT cut on electricity, which expires on Thursday, to be extended.

Together, the forecasts paint a picture of a difficult heating season ahead: a modest rise this month, a much larger one in January, record-level arrears weighing on households, and unresolved policy questions over relief for the poorest consumers and the future of the VAT reduction.