UK energy suppliers are expected to announce their combined profits this week, according to reports.
It is believed the profits of Britain's six big domestic energy suppliers have jumped from £3.9 billion to £4.5 billion over the past year.
Experts say the end-of-year profits for British Gas, which are due to be announced on Thursday, have risen by almost 50 per cent to £557 million. The profits come after the company delayed reductions of just £55 to many households.
Meanwhile, French-owned EDF Energy, Scottish and Southern Energy and Scottish Power have also witnessed a significant rises in profits.
Unions and consumer groups have called for energy suppliers to implement immediate cuts in bills given the size of their profits.
Experts are calling for average cuts of £1,200 per year due to the huge gains and because of the recent cold snap which drove energy prices up in January.
Watchdog Consumer Focus said many customers will view these profit margins as a slap in the face considering the recent modest price cuts.
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