Appendices - GSA

Table B-12: Daylighting Calculations by Site
LPOE Site Name
Total Skylight
Area (ft 2 )
Daylighting
Initial Cost
($)
Electricity
Saved
(kWh/yr)
Natural Gas
Saved
(therms/yr)
Utility
Savings
($/yr)
Daylighting
Payback
Period (yrs)
Highgate Springs 1, VT 0 $0 0 (0.0) $0 9
Highgate Springs 2, VT 951 $32,210 41113 (850.1) $2,211 15
Highgate Springs 3, VT 184 $5,751 6644 (164.9) $592 10
Blaine, WA 1,676 $50,389 59755 (635.4) $3,053 17
Danville, WA 382 $11,590 16521 (190.7) $945 12
Laurier, WA 443 $13,512 19317 (221.5) $1,350 10
Mataline Falls. WA 0 $0 0 (0.0) $0 24
Oroville, WA 0 $2 3 (0.0) 0 (16)
Point Robert, WA 1,422 $43,680 62869 (710.4) $2,613 17
Sumas, WA 0 $1 1 (0.0) $0 13
Blaine, WA 0 $1 1 (0.0) $0 16
Blaine, WA 5,542 $162,654 190793 (2,100.8) $12,501 13
Kenneth Ward, WA 886 $26,495 31399 (335.9) $2,180 12
Total $846,453.00
Therms/yr in red and in paratheses (xx.x) indicate additional natural gas will need
to be purchased/consumed at some locations to compensate for heat loss
through skylights. This extra cost was included in the Utility Savings and
Daylighting Payback Period calculations.
Note that each technology is recommended as part of the optimized solution for a
site, and these sizes minimize life-cycle costs. In other words, it is possible for
an LPOE site to cost effectively generate more RE than the optimized solution
indicates, but the life cycle costs would be higher.
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