Tens of thousands of energy customers are set to receive payouts of up to £1,000 each, and could see debts written off, in response to the scandal over the forced fitting of prepayment meters.
Energy companies are paying out more than £70m in compensation and financial support to customers.
It follows a review by the regulator, Ofgem, of the way suppliers switched often vulnerable customers to paying upfront, without their agreement, after they fell behind with their bills.
Energy UK, representing energy firms, said suppliers had worked hard to "put things right", following the intervention by Ofgem.