THE energy price cap rise which is to hit the bills of millions of families across the UK from today is just the start - with a “ticking time bomb” ready to explode come next year.

The warning comes as Ofgem’s price cap on energy bills rises by a record £139 - taking average bills to £1277.

The rise comes after another on April 1, meaning 2021 is the first year to have seen two consecutive rises, and the first to have a rise brought in before winter.

Pre-payment customers, often the worst off in society, will today see average costs rise by £153, from £1156 to £1309.

However, industry figures have warned that the next potential price cap rise, which Ofgem has a chance to bring in from April 1, 2022, will see records broken again.

READ MORE: Ofgem chief casts doubt on Tory claims that gas price crisis is temporary

This is due to a lag in the price cap’s introduction, meaning the new, higher rates brought in today do not fully reflect the 270% rise in wholesale gas prices since the beginning of the year.

Dr Craig Lowrey, a senior consultant with market research firm Cornwall Insight, said: “Although the winter 2021-22 cap was a new record ... modelling indicates that – given the extent of the increases in the wholesale market and the manner in which the cap is set – this is set to be surpassed by that for summer 2022.”

Lowrey’s warning comes alongside that of Richard Neudegg, head of regulation at Uswitch.com.

Neudegg said: “The increase that standard variable tariff customers will see on their bills from October only reflects the start of the rise in wholesale energy prices and does not include the full hike that caused the recent crisis.

“There is a retrospective lag to the price cap system which means that people won’t have the current spikes in wholesale costs passed onto them until next April, so we have a ticking time bomb on our hands.

“The Government needs to act quickly to provide better protection for the most vulnerable over the coming months. Even before a likely third consecutive hike, the targeted support available to the people who need it the most has been rendered meaningless by this price increase.”

Business Secretary Kwasi Kwarteng has said that the current energy price cap will remain in place over winter despite soaring wholesale prices and promised “there’s absolutely no question of the lights going out or people being unable to heat their homes.”