N.Y. Comp. Codes R. & Regs. tit. 16, § 720-2.4 – Short notice.

(a) Except as provided in section 720-2.3(b) of this Subpart, the power of the Public Service Commission to permit changes in existing schedules on less than 30 days' notice will be exercised only in cases where an emergency or other justifying conditions are demonstrated.
(b) Any public utility desiring to change an existing schedule on less than 30 days' notice shall file with the commission a schedule, amendment, or supplement containing the proposed change, bearing an effective date not less than 30 days after filing, and an application as prescribed in section 720-2.5 of this Subpart requesting authority to put such schedule, amendment, or supplement into effect at an earlier date.
(c) If the application is granted, a special permission order will be issued specifying the date on which the schedule, amendment, or supplement shall become effective.
(d) On schedules, amendments, statements, supplements, or addenda authorized to be made effective on less than 30 days’ notice (10 days for telecommunications non-basic service), a notation in the following form (on each leaf in the case of an entire schedule) shall be shown:
EFFECTIVE under authority of PSC (order no.) made (order issuance date).