(1) Bonds issued under this act and at any time outstanding, at any time and from time to time, may be refunded by the authority by the issuance of its refunding bonds in an amount as the authority considers necessary, but not exceeding an amount sufficient to refund the principal of the bonds to be refunded, together with any unpaid interest on the bonds and any premiums, expenses, and commissions necessary to be paid in connection with the bonds. Refunding may be effected whether the bonds to be refunded have matured or will mature in the future, either by sale of the refunding bonds to be refunded or by exchange of the refunding bonds for the bonds to be refunded by the refunding bonds.

    (2) The holders of any bonds to be refunded shall not be compelled without their consent to surrender their bonds for payment or exchange before the date on which the bonds are payable, or, if the bonds are called for redemption, before the date on which the bonds are by their terms subject to redemption. All refunding bonds issued under the authority of this section shall be payable in the same manner and under the same terms and conditions as are provided in this act for the issuance of bonds.