35 ILCS 173/5-30
A delivering supplier maintaining a place of business in this State who engages in the delivery of gas in this State shall register with the Department. A delivering supplier, if required to register under the Gas Revenue Tax Act, need not obtain an additional certificate of registration under this Law, but shall be deemed to be sufficiently registered by virtue of his being registered under the Gas Revenue Tax Act. Application for a certificate of registration shall be made to the Department upon forms furnished by the Department and shall contain any reasonable information the Department may require. Upon receipt of the application for a certificate of registration in proper form, the Department shall issue to the applicant a certificate of registration. The Department may deny a certificate of registration to any applicant if such applicant is in default for moneys due under this Law. Any person aggrieved by any decision of the Department under this Section may, within 20 days after notice of such decision, protest and request a hearing, whereupon the Department shall give notice to such person of the time and place fixed for such hearing and shall hold a hearing in conformity with the provisions of this Law and then issue its final administrative decision in the matter to such person. In the absence of such a protest within 20 days, the Department's decision shall become final without any further determination being made or notice given.
35 ILCS 173/5-30