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
Ukip has "formally reprimanded" Mike Hookem over a scuffle with colleague Steven Woolfe which landed the latter in hospital.
Popular cleaning products promoted as being fine to be flushed doing the toilet are being blamed for clogging drains and causing floods.
Showers blowing in from the West across Wales, Northern Ireland and Scotland. Largely dry with a few bright spells across central areas.