Some people could see their energy costs increase by £445
Gas and electricity costs will soar by around 28 per cent when 25 fixed deals run out at the end of March.
Some Npower customers face a 60 per cent hike pushing dual fuel bills to around £1,187 – an annual increase of £445.
It comes as E.ON announces customers will pay 15 per cent more for electricity from the end of April while gas prices will rise 4.2 per cent.
Dual fuel bills will rise around nine per cent pushing the annual household outlay to around £1,154 from £1,057.
Campaigners last night accused greedy suppliers of dealing cash-strapped families a “bitter blow”.
Energyhelpline director Mark Todd said: “Price rises are going to be enormous, for example some nPower customers face an increase of 60 per cent which will push bills from £740 to £1,187.
Approximately a million customers will be affected by the price hike
“These changes will hit around a million customers across the country with an average price rise of around £215 across 10 suppliers.
Monthly direct debit customers are set to be hit the worst
Mark Todd of EnergyHelpline
“To add insult to injury, the news comes as E.ON delivers a bitter blow to customers announcing a monstrous price rise.
“Monthly direct debit customers are set to be hit the worst as electricity tariffs increase by 15 per cent and gas goes up by 4.2 per cent.”
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Families will be hit by price rises of between £10 and £445 when deals come to an end, according to energyhelpline research.
EDF Energy tariffs will rise 31 per cent pushing bills from £824 to £1,082 while nPower customers face rises of between three per cent and 60 per cent – rises of £32 and £445.
E.ON customers are likely to ditch the supplier in their droves in the wake of news it is about to hike prices.
Peter Earl, head of energy at Comparethemarket, said customers should switch suppliers now to avoid a pricey shock later.
Experts have warned energy companies that price rises will heap pressure on households
He said: “The weather may be getting warmer but with further price hikes likely and many households on uncompetitive tariffs, consumers should not turn off to the fact that switching supplier saves on average more than £200.
“E.ON can expect customers to vote with their feet following this latest price rise.
“Our research indicates that the Big Six were big losers in February when it comes to customer retention, with 69 per cent of switches going away from the largest players.”
E.ON will become the fourth of the Big Six suppliers to hike charges following Npower, Scottish Power and EDF Energy later this month.
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Around 2.5 million customers will be hit by the rise which the firm has blamed partly on “costs it doesn’t control”.
Chief executive Tony Cocker said: “It is an announcement we never want to make.
“We will be sending more than three million letters to customers this month with personalised savings messages making it clear how easy it is to swap to another tariff that might offer cheaper prices.
“We will also be working to contact a number of potentially vulnerable customers currently on our standard variable tariff with a personalised quote for an exclusive product.”
Some nPower customers are looking at a 60 per cent increase in their bills
However experts say the giant has dished a “crippling blow” to customers while adding more than £500 million to Britain’s energy bill.
Emma Bush, expert at uSwitch said: “This is a crippling blow to energy customers and only serves to pile further pressure on household budgets, many of which are already at tipping point.
“While E.ON should be commended for its plans to reach out to its most vulnerable customers, millions will still be affected by this news.
“E.ON’s price rise is the latest in a long line of hikes which have added over £530 million to the nation’s energy bill.
“The danger now is that the remaining major suppliers will follow suit.”
An Energy UK spokesperson said: “With more people than ever making a switch with their current supplier or to a new energy company, and 50 suppliers active in the market, it is in the industry’s interest to keep prices competitive to attract and retain customers.
“It’s right that we invest in renewing our energy infrastructure, which will ultimately benefit consumers and create a low carbon economy however, as reported in Ofgem’s Supplier Cost Index, this is increasing cost pressures.
“How suppliers deal with rising costs is an issue for the individual company and their pricing strategy.”