Any permittee holding a permit granted under section 2 of this act may, with the consent of the commission, which consent may be set forth in such permit, overflow, submerge, occupy, and use, as appurtenant to the power project in behalf of which such permit is granted, and subject to the terms, stipulations, and conditions expressed therein, any island owned by the Commonwealth in the river Susquehanna, or any of its branches, or in any other stream or water over which the commission has jurisdiction.
32 P.S. § 595