S.C. Code § 6-29-540
When the local planning commission has recommended and local governing authority or authorities have adopted the related comprehensive plan element set forth in this chapter, no new street, structure, utility, square, park, or other public way, grounds, or open space or public buildings for any use, whether publicly or privately owned, may be constructed or authorized in the political jurisdiction of the governing authority or authorities establishing the planning commission until the location, character, and extent of it have been submitted to the planning commission for review and comment as to the compatibility of the proposal with the comprehensive plan of the community. In the event the planning commission finds the proposal to be in conflict with the comprehensive plan, the commission shall transmit its findings and the particulars of the nonconformity to the entity proposing the facility. If the entity proposing the facility determines to go forward with the project which conflicts with the comprehensive plan, the governing or policy making body of the entity shall publicly state its intention to proceed and the reasons for the action. A copy of this finding must be sent to the local governing body, the local planning commission, and published as a public notice in a newspaper of general circulation in the community at least thirty days prior to awarding a contract or beginning construction. Telephone, sewer and gas utilities, or electric suppliers, utilities and providers, whether publicly or privately owned, whose plans have been approved by the local governing body or a state or federal regulatory agency, or electric suppliers, utilities and providers who are acting in accordance with a legislatively delegated right pursuant to Chapter 27 or 31 of Title 58 or Chapter 49 of Title 33 are exempt from this provision. These utilities must submit construction information to the appropriate local planning commission.
S.C. Code § 6-29-540