(1) Definitions In this subsection: (A) Commissioning The term “commissioning”, with respect to a facility, means a systematic process— (i) of ensuring, using appropriate verification and documentation, during the period beginning on the initial day of the design phase of the facility and ending not earlier than 1 year after the date of completion of construction of the facility, that all facility systems perform interactively in accordance with— (I) the design documentation and intent of the facility; and (II) the operational needs of the owner of the facility, including preparation of operation personnel; and (ii) the primary goal of which is to ensure fully functional systems that can be properly operated and maintained during the useful life of the facility. (B) Energy manager (i) In general The term “energy manager”, with respect to a facility, means the individual who is responsible for— (I) ensuring compliance with this subsection by the facility; and (II) reducing energy use at the facility. (ii) Inclusions The term “energy manager” may include— (I) a contractor of a facility; (II) a part-time employee of a facility; and (III) an individual who is responsible for multiple facilities. (C) Facility (i) In general The term “facility” means any building, installation, structure, or other property (including any applicable fixtures) owned or operated by, or constructed or manufactured and leased to, the Federal Government. (ii) Inclusions The term “facility” includes— (I) a group of facilities at a single location or multiple locations managed as an integrated operation; and (II) contractor-operated facilities owned by the Federal Government. (iii) Exclusions The term “facility” does not include any land or site for which the cost of utilities is not paid by the Federal Government. (D) Life cycle cost-effective The term “life cycle cost-effective”, with respect to a measure, means a measure, the estimated savings of which exceed the estimated costs over the lifespan of the measure, as determined in accordance with section 8254 of this title . (E) Ongoing commissioning The term “ongoing commissioning” means an ongoing process of commissioning using monitored data, the primary goal of which is to ensure continuous optimum performance of a facility, in accordance with design or operating needs, over the useful life of the facility, while meeting facility occupancy requirements. (F) Payback period (i) In general Subject to clause (ii), the term “payback period”, with respect to a measure, means a value equal to the quotient obtained by dividing— (I) the estimated initial implementation cost of the measure (other than financing costs); by (II) the annual cost savings resulting from the measure, including— (aa) net savings in estimated energy and water costs; and (bb) operations, maintenance, repair, replacement, and other direct costs. (ii) Modifications and exceptions The Secretary, in guidelines issued pursuant to paragraph (6), may make such modifications and provide such exceptions to the calculation of the payback period of a measure as the Secretary determines to be appropriate to achieve the purposes of this chapter. (G) Recommissioning The term “recommissioning” means a process— (i) of commissioning a facility or system beyond the project development and warranty phases of the facility or system; and (ii) the primary goal of which is to ensure optimum performance of a facility, in accordance with design or current operating needs, over the useful life of the facility, while meeting building occupancy requirements. (H) Retrocommissioning The term “retrocommissioning” means a process of commissioning a facility or system that was not commissioned at the time of construction of the facility or system.