Fuel poverty charities have slammed a £74 million underspend in the annual Warm Home Discount scheme as "unacceptable" and have called for the money to be paid to those who missed out. Fuel Bank Foundation and National Energy Action were responding to the publication of Ofgem's latest report on the scheme, covering obligation year 2022-23. The regulator highlighted how the total budget for the scheme was £523 million and that although suppliers broadly achieved their collective spending obligations, there was a £74 million underspend on rebates.