Ind. Code § 8-1.5-2-14

Sec. 14. A municipality that constructs or acquires a utility may, through its municipal legislative body, provide for and secure the payment of the cost of constructing, acquiring, extending, or improving the utility by assigning or otherwise pledging the property acquired, together with the net earnings or profits derived or to be derived from the operation of the utility or utilities. Contracts, warrants, debentures, or pledges of future revenues entered into by a municipally owned utility are not an indebtedness of the municipality within the meaning of any constitutional debt limitation.