Ill. Admin. Code tit. 83, § 280.170
b) Timing: Once a disconnected customer remedies the reason for the disconnection or provides a valid medical certificate, the utility shall prioritize reconnection as indicated in this subsection (b). If the utility does not comply with the time limits in this subsection (b), it shall not bill the customer a reconnection charge. If, through no fault of the customer, the utility delays reconnection for two or more calendar days beyond the number of days required in this subsection (b), it shall issue a credit to the customer's account equal to two non-prorated monthly customer charges for that customer. If a disconnection is made in error, the penalty shall be an amount equal to three non-prorated monthly customer charges, in addition to any reconnection fees made for non-timely reconnection.