The “big six” energy firms have been told to hand back more than £400m owed to customers.

Credit left in customer accounts when people and businesses move or switch suppliers has accumulated over the last six years, Ofgem said.

The energy regulator, which says its estimates are the minimum owed, has called the amount “unacceptably large”.

It thinks 3.5 million domestic and 300,000 business accounts are affected

Pro-Purchase ensure that supplier charges are calculated correctly for all their customers, with any “Over-Billing” refunded promptly.

BBC News – Energy firms told to return £400m from closed accounts.

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