[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR455.64]

[Page 486-487]
 
                            TITLE 10--ENERGY
 
                    CHAPTER II--DEPARTMENT OF ENERGY
 
PART 455_GRANT PROGRAMS FOR SCHOOLS AND HOSPITALS AND BUILDINGS OWNED 
 
Subpart E_Technical Assistance Programs for Schools, Hospitals, Units of 
             Local Government, and Public Care Institutions
 
Sec. 455.64  Life-cycle cost methodology.

    (a) The life-cycle cost methodology under Sec. 455.63(b) of this 
part is a systematic comparison of the relevant significant cost savings 
and costs associated with an energy conservation measure over its 
expected useful life, or other appropriate study period with future cost 
savings and costs discounted to present value. The format for displaying 
life-cycle costs shall be a savings-to-investment ratio.
    (b) An energy conservation measure must be cost effective, and its 
savings-to-investment ratio must be greater than or equal to one no 
earlier than the end of the second year of the study period.
    (c) A savings-to-investment ratio is the ratio of the present value 
of net cost savings attributable to an energy conservation measure to 
the present value of the net increase in investment, maintenance and 
operating, and replacement costs less salvage value or disposal cost 
attributable to that measure over a study period.
    (d) Except for energy conservation measures to shift demand or to 
use renewable energy resources, the numerator of the savings-to-
investment ratio shall include net cost savings, appropriately 
discounted and adjusted for energy cost escalation consistent with 
paragraph (g) of this section, subject to the limitation that the cost 
of the energy to be saved shall constitute at least 50 percent of the 
net cost savings unless the State specifies a higher percent in its 
State plan pursuant to Sec. 455.20(u)(3).
    (e) With respect to energy conservation measures to shift demand or 
to use renewable energy resources, the

[[Page 487]]

numerator of the savings-to-investment ratio shall be net cost savings 
appropriately discounted and adjusted for energy cost escalation 
consistent with paragraph (g) of this section.
    (f) The study period for a life-cycle cost analysis, which may not 
exceed 15 years, shall be the useful life of the energy conservation 
measure or of the energy conservation measure with the longest life (for 
purposes of ranking buildings with multiple energy conservation 
measures).
    (g) The discount rate must equal or exceed the discount rate 
annually provided by DOE under 10 CFR part 436. The energy cost 
escalation rates must not exceed those annually provided by DOE under 10 
CFR part 436.
    (h) Investment costs may be assumed to be a lump sum occurring at 
the beginning of the base year, or to the extent that there are future 
investment costs, discounted to present value.
    (i) The cost of energy and maintenance and operating costs may be 
assumed to begin to accrue at the beginning of the base year or when 
they are actually projected to occur.
    (j) It may be assumed that costs occur in a lump sum at any time 
within the year in which they are incurred.