S.C. Code Ann. § 24-21-1150
(F) Public notice shall be given of all meetings and all meetings shall be open to the public, except as set forth in the rules or as otherwise provided in the compact. The Interstate Commission shall promulgate rules consistent with the principles contained in the "Government in Sunshine Act", 5 U.S.C. Section 552(b), as amended. The Interstate Commission and any of its committees may close a meeting to the public where it determines by two-thirds vote that an open meeting would be likely to: