Indiana Code Title 22. Labor and Safety § 22-6-2-2

(a) The term “public utility employer” means an employer engaged in the business of rendering electric, gas, water, telephone, or transportation services to the public in this state.

(b) The term “collective bargaining” means collective bargaining of or similar to the kind provided for by 29 U.S.C. 151 through 169 and as interpreted by decisions of the Supreme Court of the United States arising under 29 U.S.C. 151 through 169.