83 Ill. Adm. Code 763.150
Service
Section 763
Section 763.150 Service
a) All documents shall be deemed filed on the date received by
the Chief Clerk of the Commission. Service on the Chief Clerk of the
Commission cannot be made by telephone facsimile. All documents shall be
served upon the parties to the proceeding on the day they are filed with the
Chief Clerk of the Commission.
b) Proof of service of any paper shall be by certificate of
attorney, acknowledgement of receipt, or affidavit.