(1) A distribution company may request an existing customer to provide a refundable advance against the actual bill and any arrears that may accrue in respect of the premises.

(2) The refundable advance shall be double the average estimated monthly bill.
(3) The distribution company may offset the customer’s refundable advance against any outstanding bill that is not in dispute.

(4) Where a distribution company requests a customer to provide a refundable advance, the advance shall be subject to the payment of interest in accordance with rule 20.