83 Ill. Adm. Code 762.130
Service
Section 762
Section 762.130 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 must be served
upon the parties and intervenors 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.