The comments came as energy watchdog Ofgem released a report revealing that profit margins for gas and electricity firms are widening.
It estimates that on average £25 pounds is made per electricity bill and £85 is made per gas bill. This is a significant increase on February 2009.
Robert Hammond, energy expert for Consumer Focus, said: "The big question is how much longer consumers will have to wait to get a fair deal. Suppliers should cut prices now, not wait until winter bills have boosted their profits. If energy firms will not do the right thing by their customers it is time for an investigation into the industry by the Competition Commission."
He added that the amount of money made by energy firms was "laughable".
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