; (C) the guaranteed energy savings, or for contracts without a guarantee, the estimated energy savings, for the previous year, as compared to the measured energy savings for the previous year; (D) a forecast of the estimated quantity and investment value of contracts anticipated in the following year for each agency; and (E) (i) a comparison of the information described in subparagraph (B) and the forecast described in subparagraph (D) in the report of the previous year; and (ii) if applicable, the reasons for any differences in the data compared under clause (i). . (c) Definition of energy conservation measures Section 551(4) of the National Energy Conservation Policy Act ( 42 U.S.C. 8259(4) ) is amended by striking or retrofit activities and inserting retrofit activities, or energy consuming devices and required support structures . (d) Authority To enter into contracts Section 801(a)(2)(F) of the National Energy Conservation Policy Act ( 42 U.S.C. 8287(a)(2)(F) ) is amended— (1) in clause (i), by striking or at the end; (2) in clause (ii), by striking the period at the end and inserting ; or ; and (3) by adding at the end the following: (iii) limit the recognition of operation and maintenance savings associated with systems modernized or replaced with the implementation of energy conservation measures, water conservation measures, or any combination of energy conservation measures and water conservation measures. . (e) Miscellaneous authority