E.ON previously said it did not expect to raise prices

Earlier this week, E.ON said it did not expect to have to raise prices in the next 18 months "as a result of social or environment obligations".

General view of E.ON energy bills
E.ON had said it did not expect to have to raise prices in the next 18 months. Credit: Rui Vieira/PA Wire

But E.ON also warned, "There remains a risk, however, that increases in network charges or wholesale energy costs for example could force a price increase".

The announcement followed the Government's shake-up of green levies on Monday.

Read: E.ON 'does not expect to raise prices in the next 18 months'

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Energy firm E.ON raises prices

Energy supplier E.ON is to increase prices by 3.7% for average dual fuel bill (an extra £48) and gas by 4.6% (£37) from January 18.