The £153m which energy companies have pledged to return has built up over the past six years. It is made up of the money customers overpaid to a previous supplier before switching to a rival.
According to the MyEnergyCredit website, the average credit balance for those owed money stands at £50.
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The campaign is in response to a call from Ofgem back in February, for energy companies to reunite former customers with their cash.
Energy UK's chief executive Angela Knight said: "We are urging former customers to come forward and make a claim.
"Customers who think they haven’t left a forwarding address or a final meter reading when they moved or switched should contact their old supplier."
Tom Lyon, energy expert at uSwitch.com, said: "Today's announcement is welcome news and evidence that the big six energy companies are at last beginning to put consumers first. This money belongs to customers and it's only right that suppliers take steps to return it."
(CD/MH)
