220 ILCS 5/16-124
An electric utility shall not require a residential or small commercial retail customer to take additional metering or metering capability as a condition of taking delivery services unless the Commission finds, after notice and hearing, that additional metering or metering capability is required to meet reliability requirements. Alternative retail electric suppliers serving such customers may provide such additional metering or metering capability at their own expense or take such additional metering or metering capability from the utility as a tariffed service. Any additional metering requirements shall be imposed in a nondiscriminatory manner. Nothing in this subsection shall be construed to prevent the normal maintenance, replacement or upgrade of meters as required to comply with Commission rules.
220 ILCS 5/16-124