23. (1) Irish Water may make an agreement with a customer for the charging of that customer for the provision of water services.

(2) An agreement under this section may include provision for—

(a) a method of calculation of charges under section 21 in respect of the customer concerned that is different from that applicable to customers to whom an approved water charges plan applies, and

(b) the application of rates of charge under that section in respect of the customer concerned that are different from those that apply to customers to whom an approved water charges plan applies.

(3) Irish Water shall submit an agreement made under this section to the Commission and the Commission shall, as soon as practicable thereafter—

(a) approve the agreement, or

(b) refuse to approve the agreement.