(a) As used in this article:

(i) 'Economic life' means the projected or anticipated useful life of a major facility as expressed by a term of years;

(ii) 'Energy-consumption analysis' means the evaluation of all energy systems and components by demand and type of energy including the internal energy load imposed on a major facility by its occupants, equipment and components, and the external energy load imposed on a major facility by the climatic conditions of its location. The energy-consumption projections shall take into account daily and seasonal variations in energy system output during normal operations;

(iii) 'Energy systems' means all utilities, including heating, air-conditioning, ventilating, lighting and the supplying of domestic hot water;

(iv) 'Initial cost' means the monies required for the capital construction or renovation of a major facility;

(v) 'Life-cycle cost analysis' means a study to compute life-cycle costs, as required in this act;

(vi) 'Life-cycle cost' means the cost of a major facility including its initial cost, the cost of the energy consumed over its economic life and the cost of its operation and maintenance;

(vii) 'Major facility' means any publicly owned building having eighteen thousand (18,000) square feet or more of gross floor area;

(viii) 'Public agency' means every state office, officer, board, commission, committee, bureau, department and all political subdivisions of the state; and

(ix) 'Renovation' means as defined by W.S. 9-2-3001(b)(xi).