(a) The bonds and coupons issued under this chapter shall not be general obligations of the municipality, but shall be special obligations payable from and secured by a pledge of revenues derived from the municipality's electric system and otherwise secured as provided in this chapter. In no event shall the bonds and coupons constitute an indebtedness of the municipality within the meaning of any constitutional or statutory limitation.
(b) It shall be plainly stated on the face of each bond that the bond has been issued under the provisions of this chapter and that it does not constitute an indebtedness of the municipality within any constitutional or statutory limitation.
(c)
(1) In addition, the municipality is authorized to pledge to and use for the payment of the principal of and interest on the bonds, together with other expenses in connection with the bonds, surplus revenues derived from water, sewer, and gas utilities owned by the municipality.
(2) “Surplus revenues”, as used in this subsection, is defined to mean revenues remaining after adequate provision shall have been made for expenses of operation, maintenance, and depreciation and all requirements of ordinances, orders, and indentures securing bonds theretofore or thereafter issued to finance the cost of acquiring, constructing, reconstructing, extending, or improving the utilities have been fully met and complied with.