Ind. Code § 8-1-11.1-23

Sec. 23. For the purpose of providing necessary funds with which to pay the cost of acquiring any utility property, or paying off any indebtedness of or upon any utility property, so acquired, or to pay for interim costs of construction prior to long term financing, including the costs of any betterments, improvements, additions or extensions, or to pay the expenses of operation of any such utility property the board of directors for utilities may also make temporary loans, which shall mature within one (1) year from date of issuance, in the form of certificates of indebtedness, which shall be a charge solely against the income and revenue of the utility, or upon the proceeds of revenue obligations to be issued, or any combination thereof.