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Energy big E.On has mentioned its normal tariff costs will rise by an common of four.8% for these clients who take each gasoline and electrical energy.
Customers will face an common annual price rise of £55 from 16 August.
"A number of costs have risen quite sharply and we've experienced a hike in the price we have to pay for the energy our customers need," E.On mentioned.
In March, the corporate made adjustments to its payments which added £22 to its common normal variable tariff fee.
An E.On spokeswoman instructed the BBC: "Those adjustments led to the elimination of reductions and a change to the standing cost for individuals who pay on demand by money or cheque.
"This is an increase in unit price, which makes us the fourth cheapest of the big six suppliers."
For E.On's electricity-only clients the usual variable fee will rise by 6.2%, an common of £36 a yr, whereas gas-only clients will see a three.3% enhance, an common of £19.
She also stated that the corporate had been hit by a 22% enhance in wholesale prices since March.
The remainder of the massive six have all introduced costs rises lately.
- SSE payments rose an common 6.78% or £76 a yr
- British Gas payments went up by 5.5% or £60
- Scottish Power's enhance was 5.5% or £63 on common
- EDF raised electrical energy costs by 2.7% or £16
- Npower's 5.3% enhance, an common of £64, got here into impact on the weekend.
In a assertion, E.On mentioned it was its second unit price enhance in additional than four-and-a-half years, and through this era it had additionally lower costs on two events.
E.On chief government Michael Lewis mentioned: "We'll continue proactively to tell customers about the different tariffs on offer and encourage them to move to those tariffs, as well as promoting the different services that can potentially help bring their bills down such as a smart meter, a more efficient boiler or better insulation."
Victoria Arrington, from price comparability service Energyhelpline, mentioned: "This new rise is a bitter and expensive pill to swallow. The cost of sticking to a big-name energy supplier is quickly outstripping the feeling of safety it gives customers."