Ala. Code § 11-57-17
The authority may at any time and from time to time sell and issue its refunding revenue bonds for the purpose of refunding the principal of and interest on any matured or unmatured bonds of the authority at the time outstanding and for the payment of any expenses incurred in connection with such refunding and any premium necessary to be paid to redeem or retire the bonds so to be refunded. Any such refunding may be effected either by sale of refunding bonds and the application of the proceeds thereof to payment, redemption or retirement of the bonds to be refunded thereby, by exchange of the refunding bonds for the bonds or interest coupons to be refunded thereby or by any combination thereof; provided, that the holders of any bonds or coupons so to be refunded shall not be compelled without their consent to surrender their bonds or coupons for payment or exchange prior to the date on which they may be paid or redeemed by the authority under their respective provisions. Any refunding bonds of the authority shall be payable solely from the revenues out of which the bonds or coupons to be refunded thereby were payable.
All provisions of this chapter pertaining to bonds of the authority that are not inconsistent with the provisions of this section shall, to the extent applicable, also apply to refunding bonds issued by the authority.
Ala. Code § 11-57-17 (1975)