Household energy bills in the UK are predicted to surge by 16% in January, marking the most significant annual increase in four years. This forecast, shared with the BBC by consultancy Cornwall Insight, suggests a typical annual bill will jump by £276, impacting millions of households during the coldest months.

The projected rise intensifies pressure on the government to provide further support for consumers facing escalating costs. The forecast comes just a day before regulator Ofgem's October price cap comes into effect, which will see a 4% increase for households on variable tariffs.

EDF's CEO, Simone Rossi, has warned that the UK is heading into a "second energy crisis" and called for an extension of the VAT cut on electricity, which is set to begin on Thursday. Prime Minister Andy Burnham echoed concerns about the difficulty of current energy, petrol, and diesel costs, stating that measures to alleviate pressure on households are being considered.

Approximately 20 million households across England, Scotland, and Wales are subject to Ofgem's variable price cap. The immediate October increase will add about £60 annually, or £5 per month, to the typical bill, bringing it to £1,723. This rise would have been higher without the government's VAT reduction, which saves about £45 a year.

Cornwall Insight's forecast indicates that the typical annual bill could reach £1,999 in January. Craig Lowrey, a principal consultant at Cornwall Insight, highlighted that this predicted 16% increase will hit households particularly hard, coinciding with increased winter heating needs and post-Christmas financial strain.

The surge in energy prices is attributed to disruptions in global gas supplies stemming from the conflict in the Middle East, leading to low gas storage levels across Europe. Experts suggest that rebuilding these reserves could sustain high bills beyond the winter period.

Cornwall Insight is a respected forecaster with a strong track record, and its predictions align with those from some energy suppliers. While the actual January price cap will be announced by Ofgem in late November, the current trajectory suggests a substantial increase is likely.

Any potential easing of geopolitical tensions could influence international energy costs, but with the price-setting period for the January cap already underway and little sign of de-escalation, a significant rise for consumers on non-fixed tariffs appears highly probable. Lowrey indicated that a January price hike is "all but certain."