[BLDG-SIM] Photovoltaics - cost payback

[Brian Thornton]

One other note, the payback changes dramatically with the solar resource.
In Portland Oregon, we get about 1000 kWh/year for 1 kW capacity. 

 

Brian

 

Thornton Energy Consulting

p. 503-231-6600 f. 503-231-3555

thorntonenergy at comcast.net

 

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Pat Bailey
Sent: Friday, February 16, 2007 3:18 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Photovoltaics - cost payback

 

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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