Subject to this Act, an authority shall have the power to do all things necessary for, or incidental to, the implementation of this Act, including the power to borrow, raise and expend moneys:
Provided that the enactment in terms of which an authority is constituted, relating to the power to borrow, raise or expend moneys, shall apply, mutatis mutandis, to the borrowing, raising and expenditure of moneys by the authority for the purposes of this Act.