The energy supplier, First Utility, has announced it is to increase one of its most popular tariffs by an average of 18%.
The news will come as further disappointment to households already struggling with increasingly high living costs, with the average annual bill of a typical UK energy tariff estimated to be £1,420.
First Utility has faced criticism from consumers groups following the price increase, particularly as many of its 180,000 customers claim they had chosen the company to break away from the 'big six' energy suppliers.
All of the major energy providers upped their prices last winter, coinciding with the country being gripped by sub-zero temperatures.
Mark Todd, director of independent price comparison site energyhelpline, said: "Consumers will be exasperated to see yet more price rises. It seems that the price rise trend has simply become the norm, despite the pledges from the Government that this must end.
"We recommend that consumers should regularly compare and switch suppliers to claw back some of the burden. At the moment there are a number of cheap fixed tariffs available which could protect you from price rises for as long as three years," he concluded.
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