EDF Energy have announced that electricity and gas prices will increase by will rise by 3.9 per cent from January 3.
The French-owned group claimed it was "holding back" the full impact of rising charges to limit the increase for its 3.7 million residential customers.
The tariff rise - which will come into effect on January 3 - means its average annual standard variable rate bill will increase by around £49 a year to £1,300.
An estimated 2.4 million households will be affected by EDF's price rise, with around a third of its customers on fixed-tariff deals.
More top news
Outbreaks of rain will continue to spread northeastwards, turning most persistent and heavy in the southwest
Former shadow foreign secretary Hilary Benn led calls by a series of senior Labour MPs urging colleagues to 'win' back the party.
A team of detectives and specialists is set to begin a painstaking excavation of the area where Ben is thought to have gone missing in 1991.