When any state agency or department must replace or supplement major items of energy-consuming equipment in existing state-owned or leased structures or any self-contained unit of any structure with other major items of energy-consuming equipment, the selection of such items shall be made on the basis of a life cycle cost analysis of alternatives in accordance with rules and regulations promulgated by the Director of the Office of Management and Enterprise Services.
Okla. Stat. tit. 61, § 211