As used in this subchapter:
(1) “Invested” includes expenditures made from the proceeds of bonds, including interim notes or other evidence of indebtedness, issued by a municipality, county, or an agency or instrumentality of a municipality, county, or the State of Arkansas, if the obligation to repay the bonds, including interest thereon, is a legal binding obligation, directly or indirectly, of the taxpayer; and
(2) “Qualified manufacturer of steel” means any natural person, company, or corporation engaged in the manufacture, refinement, or processing of steel whenever more than fifty percent (50%) of the electricity or more than fifty percent (50%) of the natural gas consumed in the manufacture, refinement, or processing of steel is used to power an electric arc furnace or furnaces, continuous casting equipment, or rolling mill equipment in connection with the melting, continuous casting, or rolling of steel or in the preheating of steel for processing through a rolling mill or rolling mills, or both.