(a) As used in this chapter:
(i) "Cost of relocation" means the entire amount paid by a utility properly attributable to relocation after deducting therefrom any increase in the value of the new facility and any salvage value derived from the old facility;
(ii) "Department" means the department of transportation created by W.S. 24-2-101;
(iii) "Federal-aid highway system" means the federal-aid primary highway system, the federal-aid secondary highway system and the interstate system, including extensions of any of them within urban areas;
(iv) "Interstate system" means any highway now or hereafter included as a part of the national system of interstate and defense highways provided for in Title 23 of the United States Code;
(v) "Utility" means all publicly, privately and cooperatively owned utilities, regulated and unregulated, supplying utility services to or for the public.