EDF Energy is to increase gas prices by 6.5% and electricity prices by 7.5% from 2 March, the company has said.
The company is the last of the "big six" energy firms to increase prices, and it follows a heavily-promoted decision to freeze prices over the winter.
EDF blamed wholesale costs and other charges for the change.
Energy regulator Ofgem is currently investigating the prices charged to domestic customers.
Price changes
The move from EDF comes the day before E.On's price change comes into effect. E.On's customers will be subject to an average 9% increase in electricity prices and a 3% rise in gas prices.
In the last week of November, Scottish Power increased electricity bills by an average of 8.9% and prices for gas customers increased by an average of 2%.
Scottish and Southern Energy followed by putting up its domestic gas tariffs by 9.4% at the start of December.
The 7% rise in gas and electricity bills for British Gas customers started on 10 December.
Npower customers saw their gas and electricity bills rise by 5.1% on 4 January.
http://www.bbc.co.uk/news/business-12359722 - for further details
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