Any municipality may refinance or refinance and improve any enterprise and for such purpose may borrow money and issue refunding bonds from time to time. Any municipality, which shall have outstanding bonds issued pursuant to this chapter, and which shall have, in the resolution authorizing such bonds, reserved the right to issue additional bonds, payable in whole or in part from the revenues of the enterprise, may issue such additional bonds pursuant to and in accordance with the provisions of this chapter, notwithstanding that the proceeds of such additional bonds be used solely for the improvement of the enterprise.