S.C. Code § 58-33-420
The commission, in the discharge of its duties under this chapter or any other statute, is authorized to hold joint hearings within or without the State and issue joint or concurrent orders in conjunction or concurrence with any official or agency of any other state of the United States, whether in the holding of any hearings, or in the making of such orders, the commission shall function under agreements or compacts between states or under the concurrent power of states to regulate interstate commerce or as an agency of the United States, or otherwise. The commission, in the discharge of its duties under this chapter, is authorized to enter into agreements or compacts with agencies of other states, pursuant to any consent of Congress, for cooperative efforts in certificating the construction, operation, and maintenance of major utility facilities in accord with the purposes of this chapter and for the enforcement of the respective state laws regarding same. The commission may request the Office of Regulatory Staff to make joint investigations with any official board or commission of any state or of the United States.
S.C. Code § 58-33-420