An applicant is liable for all EUSP payments made on the applicant's behalf in excess of the maximum allowable benefit. The local agency shall require the eligible household's electric company, or low-income weatherization contractor or vendor, to return the amount of an overpayment from any unused benefit to the Administration. The electric company shall return any unused benefit for which the applicant may not be held liable, in the event the benefit cannot be applied to an active electric account.