Household energy debt has hit an eight-year high before winter, figures show.
Households are starting the winter owing Β£780 million to their energy suppliers, the highest debt levels in eight years, a survey for Uswitch found.
Some 3.5 million households owe money to their provider, up 46% from 2.4 million last year, the comparison site said.
The current average household debt figure of Β£223 is 29% higher than last yearβs Β£173.
Across all households, the average bill payer was Β£128 in credit last year but this has dropped to Β£98 this year β falling below Β£100 for the first time since the energy crisis began.
Households usually pay a fixed amount each month that tends to exceed their actual summer usage in order to build up credit to cover the more expensive winter months.
However, more than two million low-income households β and 10 million UK homes overall β have no energy credit built up to cope with higher winter bills.
Of the 55% of households who do have a credit balance, this has dropped slightly from last autumnβs average of Β£222 to the current Β£214.
Recent figures from regulator Ofgem showed that customers owed energy suppliers more than Β£4 billion, an increase of more than Β£750 million on the previous year.
Ofgemβs debt figure is the total amount that customers owe their suppliers for unpaid bills, whereas Uswitch is measuring the current balance of a householdβs energy account.
One in six homes (16%) with a household income of less than Β£20,000 a year already owe money to their energy supplier before winter, with indebted homes owing Β£60 on average.
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One in 10 households in debt to their supplier (12%) say they cannot afford to pay it off, double that of last year (6%).
Another 9% plan to move onto a prepayment meter to pay off their debt.
Of those in debt, 34% say their supplier has not contacted them about the amount they owe. However 57% of those who were contacted said they were offered help or advice.
Ofgemβs energy price cap rose by 2% from October 1 for a typical household in England, Scotland and Wales, just as cooler temperatures see many switching on their central heating.
This means that the energy bill for the average household paying by direct debit for gas and electricity increased from the previous Β£1,720 to Β£1,755 per year.
Many households reported planning βdrasticβ measures to reduce their energy bills, Uswitch said, with 40% saying they will wear extra layers at home so they can keep their heating down and a third saying they will turn the thermostat down.
Ben Gallizzi, energy spokesman at Uswitch, said: βItβs deeply concerning to see that household energy debt has soared to an eight-year high, which suggests that many homes may face a bill shock soon as direct debit levels are updated.
βThe cost of living squeeze and the end of many government support schemes means that households are getting less help than they used to, causing many to fall behind.
βHouseholds use more energy over the winter, so for those paying via direct debit itβs ideal to have a cushion of about two monthsβ worth of energy credit at this point in the year.
βIf your energy account is going into debt, or you are behind on your bill payments, speak to your supplier as soon as possible.β
An Ofgem spokeswoman said: βThe current levels of energy debt are unsustainable, and this is a challenge that requires action from everyone β the regulator, Government and industry alike.
βItβs important we target support at the customers that need it most, while also ensuring people who are able to pay are supported to do so.
βIf a customer is struggling they should speak to their supplier about the options that could help them get back on track.
βThese could include tailored repayment plans, which can help households regain control and avoid falling further behind.
βWeβre also working at pace on plans to introduce a debt relief scheme that could help struggling households get back on track and rectify some of the debt that built up as a result of the crisis.β
A government spokesperson said: βWe are delivering reforms that put consumers first, with stronger protections including automatic compensation when energy companies mistreat billpayers.
βWe are working with Ofgem toΒ drive debt out of the energy system. To help people with the cost of living, this winter weΒ are expanding the Β£150 Warm Home Discount to over six million households.β
Opinium surveyed 2,000 UK energy bill payers between October 3-8.