N.Y. Comp. Codes R. & Regs. tit. 16 § 98.4
The portion of the electric distribution system and/or electric service line beyond the limits of a public R/W shall be provided, placed, constructed and maintained in accordance with such reasonable rules for the construction and maintenance thereof as may be filed in the tariff schedules of each utility consistent with Parts 100 and 101 of this Title. If a utility installs distribution facilities beyond the limits of a public R/W or an applicant does so pursuant to the utility's tariff, or if a utility installed distribution facilities beyond the public R/W or allowed an applicant to do so in the past, the utility shall maintain, repair and if necessary replace at its own expense such distribution facilities, provided that any necessary easements are provided by the applicant or customer. If a utility installs a service line beyond the limits of a public R/W, the utility shall maintain, repair and if necessary replace such service line, at its own expense, to the same extent that the utility bore the cost of installing the service line, and provided that any necessary easements are provided by the applicant or customer.
N.Y. Comp. Codes R. & Regs. Tit. 16 § 98.4