65 ILCS 85/1
Without submitting the question to the legal voters thereof for approval the corporate authorities of any city, village or incorporated town having a population of less than five hundred thousand (500,000), may, by ordinance, authorize the issue of refunding revenue bonds payable solely from the revenues of a municipally owned electric light plant and system to refund the principal of its outstanding revenue bonds, public utility certificates, certificates of indebtedness, electric light plant and system certificates of indebtedness, revenue notes or any other securities prior to their maturity and the principal of any such securities that have matured and which remain outstanding and issued under the provisions of any laws of this State and which by their terms are payable solely from the revenues of a municipally owned electric light plant and system.
The refunding revenue bonds may be made registerable as to principal and may bear interest at a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable at such time and at such places as may be provided for in the ordinance authorizing the issuance thereof.
With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.
65 ILCS 85/1