Almost 100,000 E.On customers with pre-payment metres will receive an average of £144 each because of an billing error by the energy supplier, the regulator Ofgem has said.
E.On failed to pay the credit in the accounts of mostly vulnerable customers who had ended their contract with the supplier in a mandatory six-week window.
It will now pay both the credit and millions in compensation to the customers affected between February 2021 and September 2023.
Ofgem called the error "unacceptable". E.On said it was "deeply sorry" and that all identified affected customers have been contacted.