Energy supplier E.On is to increase its standard variable dual fuel prices by an average of 8.8% from April 26.
The energy giant said its standard electricity prices will increase by an average of 13.8% and standard gas prices will rise by an average of 3.8% "due in large part to increasing policy costs and other costs it doesn't control".
Around 2.5 million of E.On's residential customers - 62% - will "potentially" see an increase if they take no action before April 26, the company said.
E.On's announcement follows a spate of energy price rises in recent months.
Npower, EDF and Scottish Power are among those to have ramped up bills, with many blaming rising wholesale costs.
Co-operative Energy is also increasing the cost of its standard variable tariff by an average of 5%.
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EDF Energy and British Gas have become the latest energy suppliers to cut their gas prices.
British Has announced a 5.1% reduction by March 16, while EDF said they would slash their rates by 5% from March 24.
Energy firm npower has announced a 5.2% reduction in its gas prices effective from 28 March 2016.
This will lower standard domestic gas tariff prices by an average £32 a year, according to the firm.
The savings will apply to both new and existing customers and 1.2 million will benefit from this price cut, a statement on its website said.
This cut in gas prices is welcome news for many of our customers. We have balanced the wholesale price fall against increases in the other costs we are charged.
It follows similar cuts from rival Big Six providers SSE and E.On last month.
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