For the purposes of this Act:
     (a) “Commission” means the Illinois Commerce Commission, or its successor agency.
     (b) “Small business” means any Illinois based business which meets the requirements under Section 3 of the “Illinois Small Business Purchasing Act”, approved September 1, 1972, as now or hereafter amended.
     (c) “Customer” means a small business, as herein defined, which has agreed with a utility to pay for gas, electric, telecommunication, water or sanitary sewer utility service.
     (d) “User” means a small business, as herein defined, which receives gas, electric, telecommunication, water or sanitary sewer utility service.
     (e) “Utility service” means electricity, gas telecommunications, water or sanitary sewer service supplied by a public utility.
     (f) “Public utility” shall have the same meaning as defined in Section 3 of the “Citizens Utility Board Act”, certified December 1, 1983, as now or hereafter amended.
     (g) “Small Business Utility Advocate” or “Advocate” means the person appointed pursuant to Section 4 of this Act.