Power firms are planning a 10 per cent hike in gas and electricity prices despite making massive profits in last winter's cold weather.
Average bills for a couple will go up this winter by around £115 to £1,265 a year. Bills for larger households will increase from an average of £1,500 to £1,650.
British Gas, the UK's biggest supplier, which doubled its half-year profits up to June to £585m, has already warned higher prices are on the way.
Mark Todd, of price comparison website energyhelpline.com, said: "This is the last thing people need. We are very fearful about the impact on hard-up families and pensioners who might be tempted to turn down their heating to cut costs."