EDF Energy customers will see a 10.8 per cent rise in gas and electricity prices from 7 December, reported the BBC.
EDF, which has three million domestic customers, is the fifth major energy firm to announce price rises and it is the biggest average increase so far.
The company blamed the cost of wholesale energy and government charges including mandatory energy efficiency and social schemes.
EDF, which claimed that its prices would still be lower than the other major suppliers who have already announced price rises, said that the average dual fuel bill would go up by £2.35 a week, the equivalent of more than £122 a year to bring the total bill to £1,251 a year.
The price rise is higher in percentage terms than any of the other suppliers, and leaves E.On as the only supplier among the big six yet to announce price rises this autumn and winter.
E.On has previously said that it would leave prices unchanged for the rest of the year.
The round of price changes has prompted some political debate, and has come as the energy regulator Ofgem announced plans to simplify bills to make the switching process easier.
However, some uncertainty remains over Prime Minister David Cameron’s comments that energy suppliers would be forced to put their customers on the cheapest tariff.
All the latest energy price rises are displayed as an average across the UK. However, price changes might differ depending on where residents live in the country.
EDF cut gas prices by 5 per cent in the spring, and was the last of the big six to announce price rises last winter, when it put up gas prices by 15.4 per cent and electricity prices by 4.5 per cent.
It has pledged that about 100,000 of its most vulnerable elderly customers would only be charged the equivalent of its cheapest tariff from this winter.