All assistance provided under this chapter shall be disbursed by the grantee or charitable organization. Where possible the district shall be paid on behalf of the customer by the grantee or the charitable organization. When direct vendor payment is not feasible, a check shall be issued jointly payable to the customer and the district. The availability of funds for assistance to a district's low-income customers as a result of voluntary contributions shall not reduce the amount of assistance for which the district's customers are eligible under the federally funded energy assistance programs administered by the grantee of the department of commerce within the district's service area. The grantee or charitable organization shall provide the district with a quarterly report on January 15th, April 15th, July 15th, and October 15th which includes information concerning the total amount of funds received from the district, the names of all recipients of assistance from these funds, the amount received by each recipient, and the amount of funds received from the district currently on hand and available for future low-income assistance.