; or (bb) the date— (AA) of the most recent commissioning, recommissioning, or retrocommissioning; or (BB) on which ongoing commissioning began; or (II) has a long-term contract in place guaranteeing energy savings at least as great as the energy savings target under subclause (I). (4) Implementation of identified energy and water efficiency measures (A) In general Not later than 2 years after the date of completion of each evaluation under paragraph (3), each energy manager may— (i) implement any energy- or water-saving measure that the Federal agency identified in the evaluation conducted under paragraph (3) that is life-cycle cost effective; and (ii) bundle individual measures of varying paybacks together into combined projects. (B) Measures not implemented The energy manager shall, as part of the certification system under paragraph (7), explain the reasons why any life-cycle cost effective measures were not implemented under subparagraph (A) using guidelines developed by the Secretary. ; and (D) in paragraph (7)(C), by adding at the end the following: (iii) Summary report The Secretary shall make available a report that summarizes the information tracked under subparagraph (B)(i) by each agency and, as applicable, by each type of measure. . 422. Federal building energy efficiency performance standards; certification system and level for green buildings (a) Definitions Section 303 of the Energy Conservation and Production Act ( 42 U.S.C. 6832 ) (as amended by section 101(a)) is amended— (1) in paragraph (6), by striking to be constructed and inserting constructed or altered