Homeowners may choose to compare energy prices with news from a watchdog that average annual overcharging surpasses £70.
All the UK's major energy companies increased their prices throughout 2008 and most blamed a surge in wholesale costs, but Consumer Focus has said firms have still not lowered consumer prices as much as they could have done.
The watchdog said that electricity should be nearly £14 cheaper each year, while gas should cost over £60 less on an annual basis.
Philip Cullum of Consumer Focus said: "Our new research for the first time shows the reality. The companies are pocketing £1.6 billion extra, while millions of households struggle to make ends meet."
The Energy Retail Association, the body that represents energy firms in the UK, said that although wholesale costs have fallen, other prices have not and there are a range of factors that influence what consumers eventually pay.
Price increases last year are thought to have pushed more families into fuel poverty, where they allocate more than ten per cent of their annual income towards energy bills.
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