S.C. Code § 5-31-1910
Any city or town in this State owning a water or light plant may, through the proper officials of such city or town, enter into a contract with any person without the corporate limits of such city or town but contiguous thereto to furnish such person electric current or water from such water or light plant of such city or town and may furnish such water or light upon such terms, rates and charges as may be fixed by the contract or agreement between the parties in this behalf, either for lighting or for manufacturing purposes, when in the judgment of the city or town council it is for the best interest of the municipality so to do. No such contract shall be for a longer period than two years but any such contract may be renewed from time to time for a like period.
S.C. Code § 5-31-1910