REVENUE BONDS.

(a) The agency may issue revenue bonds to accomplish the purposes of the agency.

(b) The agency may pledge to the payment of the obligations the revenues of all or part of its electric facilities, including facilities acquired after the obligations are issued. However, operating and maintenance expenses, including salaries and labor, materials, and repairs of electric facilities necessary to render efficient service constitute a first lien on and charge against the pledged revenue.

(c) The agency may set aside from the proceeds from the sale of the obligations amounts for payment into the interest and sinking fund and reserve fund, and for interest and operating expenses during construction and development, as specified in the proceedings authorizing the obligations.

(d) Obligation proceeds may be invested, pending their use, in securities, interest-bearing certificates, or time deposits as specified in the authorizing proceedings.

(e) Agency obligations are authorized investments for:

(1) a bank;

(2) a savings bank;

(3) a trust company;

(4) a savings and loan association; and

(5) an insurance company.

(f) The obligations, when accompanied by all appurtenant, unmatured coupons and to the extent of the lesser of their face value or market value, are eligible to secure the deposit of public funds of this state, a political subdivision of this state, and any other political corporation of this state.