Ill. Admin. Code tit. 83, § 462.120 – Obligations of Electric Utilities

a) Except as provided in subsection (b), an electric utility shall not issue to a retail customer a rebate or other energy efficiency incentive greater than $300 for the installation of an energy efficiency measure covered by this Part, unless the electric utility receives from the customer:
1. 1) a certification that the person installing the energy efficiency measure covered by this Part was a self-installer; or
2. 2) evidence that the energy efficiency measure covered by this Part was installed by an entity certified under this Part that is in good standing with the Commission.
b) An electric utility subject to the requirements of this Part shall be permitted to petition the Commission for an increase in the initial $300 value identified in subsection (a). The petition shall be supported by data or analyses supporting the proposed new value and shall be granted upon good cause being shown by the utility. If, after notice and hearing, the Commission approves a new threshold value, then the value established in subsection (a) shall no longer apply.
c) Notwithstanding anything to the contrary, for purposes of this Part, an "energy efficiency measure covered by this Part" does not include a measure installed on or before December 31, 2017, regardless of when the incentive or rebate application is submitted.