35 ILCS 120/1d
Subject to the provisions of Section 1f, all tangible personal property to be used or consumed within an enterprise zone established pursuant to the "Illinois Enterprise Zone Act", as amended, or subject to the provisions of Section 5.5 of the Illinois Enterprise Zone Act, all tangible personal property to be used or consumed by any High Impact Business, in the process of the manufacturing or assembly of tangible personal property for wholesale or retail sale or lease or in the process of graphic arts production if used or consumed at a facility which is a Department of Commerce and Economic Opportunity certified business and located in a county of more than 4,000 persons and less than 45,000 persons is exempt from the tax imposed by this Act. This exemption includes repair and replacement parts for machinery and equipment used primarily in the process of manufacturing or assembling tangible personal property or in the process of graphic arts production if used or consumed at a facility which is a Department of Commerce and Economic Opportunity certified business and located in a county of more than 4,000 persons and less than 45,000 persons for wholesale or retail sale, or lease, and equipment, manufacturing or graphic arts fuels, material and supplies for the maintenance, repair or operation of such manufacturing or assembling or graphic arts machinery or equipment. The exemption provided in this Section for tangible personal property to be used or consumed in the process of manufacturing or assembly of tangible personal property for wholesale or retail sale or lease, and the repair and replacement parts for that machinery and equipment, does not apply to such property used or consumed in (i) the generation of electricity for wholesale or retail sale; (ii) the generation or treatment of natural or artificial gas for wholesale or retail sale that is delivered to customers through pipes, pipelines, or mains; or (iii) the treatment of water for wholesale or retail sale that is delivered to customers through pipes, pipelines, or mains. The provisions of this amendatory Act of the 98th General Assembly are declaratory of existing law as to the meaning and scope of this exemption.
35 ILCS 120/1d