N.Y. Comp. Codes R. & Regs. tit. 16, § 100.2 – Connection from existing electric facilities to residential subdivisions.

(a) The connection from the existing electric distribution system to the underground distribution lines installed within the applicant's residential subdivision shall be made in accordance with the following requirements:
1. (1) a utility may, at its discretion and expense, install or provide for the installation of lengths of underground supply line in addition to that portion which is required to be provided without contribution to applicants pursuant to section 98.2 of this Title; and
2. (2) where any part of a supply line in excess of the footage requirements of section 98.2 of this Title is to be placed overhead, an applicant must submit a written application to the utility at least 75 days prior to the projected commencement of the construction of the supply line, and the utility must report such projected construction to the commission no later than 45 days before such construction is commenced, the commission reserving the right to require the underground installation of particular lines, on the basis of the relevant economic, engineering, or environmental factors.
(b) In the event a utility either intends, at its own discretion, or is required pursuant to this Part, to place underground connecting supply lines between an existing electric system and the underground distribution lines installed within an applicant's residential subdivision, it shall inform the telephone company and cable television company serving the area in which the residential subdivision is located. If a new common access route from the existing electric system to the residential subdivision will be used, the connecting supply lines of the utility and the telephone company and cable television company shall be placed underground.