The move, affecting 6.3 million users, will see an average dual-fuel bill leap from £1,196 to £1,258 a year.
Npower is the fourth big supplier to announce a winter bill increase, with the German-owned firm insisting it was forced to pass on higher costs, including a 50% jump in wholesale costs.
Yet its profits hit £220million last year and the Mirror revealed yesterday that energy firms are cashing in on the big freeze with gas demand soaring 25%. Industry regulator Ofgem is launching an investigation into rip-off claims as suppliers’ profits have soared 40% since autumn.
Audrey Gallacher, of watchdog Consumer Focus, said: “Customers will have been bracing themselves for this bad news but that won’t make them any less worried about affording their bills.”
3The price of petrol has soared to a record high, the AA said yesterday. The average price is now 121.76p a litre, beating the previous record of 121.61p.