The energy regulator Ofgem has told provider E.ON Next to pay up £14.5m for failing to provide final bills and refunds to its customers. E.ON failed to provide customers energy bills or give them back money owed on credit balances for prepayment meters. This comes after an investigation by Ofgem found that nearly 250k prepayment meter accounts had been affected between early 2021 and late 2023. The failures were the result of an error within E.ON’s billing system, which E.ON Next self-reported to Ofgem. In an announcement to markets…