Sec. 720-1.6. Responsibility for filing

(a) Each public utility shall file copies of its schedules with the commission, in a form prescribed by the Department of Public Service, showing all rates and charges made, established, or enforced, or to be charged or enforced, all forms of contract or agreement, except as provided in section 720-1.4 of this Subpart, and all related rules and regulations. The acknowledgment of the receipt of any schedule by the commission, or the fact that any schedule, amendment, supplement, or statement is on file with the commission shall be without prejudice to investigation and subsequent determination by the commission as to its lawfulness, either upon complaint or on its own motion, and without prejudice to suspension, change, or rejection as may be provided by law.

(b) Corporations and municipalities shall file schedules and contracts as provided under this Part immediately upon becoming subject to the jurisdiction of the commission.