[BLDG-SIM] Photovoltaics - cost payback
Pat Bailey
pbailey at greenbuildingstudio.com
Fri Feb 16 15:17:47 PST 2007
In CA, there has been a very detailed summary of costs prepared for the
PUC. The values in the table below are costs prior to any incentives
and are through some point in 2006.
The payback is very sensitive to various tax incentives that can vary
by state and by entity. For example, the State of
California/Utilities/PUC have incentives that vary depending on whether
or not an entity pays taxes and therefore can benefit from tax
deductions, increased depreciation, etc. The "per kWh/per W" incentives
are higher for entities that don't benefit from the tax benefits.
We have seen paybacks ranging from something like 6-7 years on the low
end (including incentives) to approx. 11 years on the high end. There
is a large amount of variability depending on size and complexity. We
typically assume $8/Watt as a baseline cost for schematic purposes.
Pat
$/Watt Installed
System Size
Status
Total # Projects
Low
Avg
Median
High
St. Dev.
< 50
Complete
236
$ 4.37
$ 8.89
$ 8.96
$ 15.47
$ 1.44
Active
112
$ 2.77
$ 8.31
$ 8.54
$ 17.60
$ 2.21
51 - 100
Complete
107
$ 4.93
$ 9.05
$ 8.89
$ 17.72
$ 1.82
Active
195
$ 5.13
$ 9.66
$ 10.10
$ 22.99
$ 1.84
101 - 200
Complete
100
$ 4.28
$ 8.40
$ 8.44
$ 15.90
$ 1.51
Active
128
$ 2.81
$ 8.73
$ 8.88
$ 14.28
$ 1.53
201 - 500
Complete
56
$ 4.64
$ 7.90
$ 7.94
$ 11.82
$ 1.28
Active
123
$ 3.50
$ 9.06
$ 8.51
$ 21.10
$ 2.65
501 +
Complete
17
$ 4.51
$ 7.54
$ 7.50
$ 10.36
$ 1.50
Active
77
$ 3.51
$ 8.18
$ 8.21
$ 10.79
$ 1.18
_____________________________________
Pat Bailey, PE
Vice President
Green Building Studio, Inc.
444 Tenth Street, Suite 300
Santa Rosa, CA 95401
707-569-7373 x101 - voice
707-569-7313 - fax
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