Britain's six biggest energy producers are making a profit of £125 per customer.
As consumers prepare for what is forecast to be more severe weather this winter, the profits being made by energy companies continue to rise.
Regulator Ofgem says the annual duel fuel bill has soared to £1,345, an increase of £175.
The regulator says profit margins are expected to fall back next year, but the market is still being stifled by complex tariffs.
Ofgem is pushing ahead with the introduction of simplified charges.
Wholesale energy prices have risen by 40% over the last year and could continue to grow.
The news comes at a time when £200bn worth of investment is needed to overhaul Britain's energy industry.