23 CAR § 455-514. Partial payments

(a) Nonutility charges. Unless otherwise specified in writing by the customer, a utility shall first credit payment to utility charges if a customer pays part of a utility bill that includes charges for nonutility service. (b) Application between past and current bills. (1) If a customer pays part of a bill for utility service, a utility shall first credit the payment to earlier charges for utility service. (2) This section does not apply when there: (A) Is a disputed bill; (B) Is a delayed payment agreement; or (C) Are other written instructions.