N.C. Gen. Stat. § 160A-58.5
For the purposes of G.S. 160A-314, provision of public enterprise services within satellite corporate limits shall be considered provision of service for special classes of service distinct from the classes of service provided within the primary corporate limits of the city, and the city may fix and enforce schedules of rents, rates, fees, charges and penalties in excess of those fixed and enforced within the primary corporate limits. A city providing enterprise services within satellite corporate limits shall annually review the cost thereof, and shall take such steps as may be necessary to insure that the current operating costs of such services, excluding debt service on bonds issued to finance services within satellite corporate limits, does not exceed revenues realized therefrom.
N.C. Gen. Stat. § 160A-58.5