N.Y. Comp. Codes R. & Regs. tit. 16, § 14.12
(3) Unless a customer does not have access to the meter or the customer will be unable to obtain a reliable reading, the utility must, at the time of any unsuccessful attempt to obtain an actual reading, leave at the premises or mail the customer a meter reading card.
(b) Estimated bills.
(1) A utility may render an estimated bill for a regular cycle billing period only when:
(2) Every estimated bill must be calculated in accordance with an established formula which takes into account the best available relevant factors for determining the customer's usage.
(c) No access procedure.
(3) The series of no access notices is as follows:
(a) Meter reading.