Ala. Code § 22-29-11
In anticipation of the issuance of bonds, the authority may borrow such sums as may be needed, not exceeding $500,000.00 to be outstanding at any one time, for any of the purposes enumerated in this chapter and to obligate itself by certificate or promissory note, bearing interest at a rate or rates to be specified by the authority, and maturing within 18 months from date. Such certificates or promissory notes shall be payable solely from the proceeds of the bonds of the authority and from the funds from which such bonds are payable. In the event that state funds are not available for a state grant for a project when application is made, in order to accelerate the completion of any project, the local public body may, with the approval of the authority, obligate such local public body to provide local funds to pay that portion of the cost of the project which the state will make available by grant, and the state shall refund the amount expended on its behalf by such local public body.
Ala. Code § 22-29-11 (1975)