The Commission shall have full authority to make joint investigations, hold joint hearings within or outside the State of Vermont, and issue joint or concurrent orders in conjunction or concurrence with any official, board, commission, or agency of any state or of the United States, whether, in the holding of such investigations or 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 federal government, or otherwise. (Added 1969, No. 39.)