Ill. Admin. Code tit. 83, § 280.135
a) Notwithstanding any other provision of this Part, no electric or gas public utility shall disconnect service to any residential customer or master-metered apartment building for nonpayment of a bill or deposit where gas or electricity is used as the primary source of space heating equipment at the premises during the period of time from December 1 through and including March 31 of the immediately succeeding calendar year, unless:
1) The utility:
b) Prior to termination of service for any residential customer or master-metered apartment building during the period from December 1 through and including March 31 of the immediately succeeding calendar year, all electric and gas public utilities shall, in addition to all other notices:
1) Notify the customer or an adult (a person over the age of 18) residing at the customer's premises either by telephone, a personal visit to the customer's premises or by first class mail, informing the customer that:
c) No public utility shall disconnect service for nonpayment of a bill until the lapse of six business days after making the notification required in subsection (b)(1) so as to allow the customer an opportunity to:
j) Filing with the Commission:
1) Each utility shall file with the Commission prior to December 1 of each year a plan detailing the implementation of this Section. This plan shall contain, but not be limited to: