I tripped across this today when doing some research following up on an inquiry after my blogging from the Built Green Conference last Friday.

Check out this article from May/June 2006 Solar Today by Andy Black.

Oh just added this to a post from last Friday but wanted to call it to your attention:

According to Rick Nevin and Gregory Watson “An Increase in Property Resale Value occurs in homes with solar electric systems because these systems decrease utility operating costs.” According to a 1998 US Appraisal Journal article by Rick Nevin and Gregory Watson, a home’s value increases $20,000 for every $1,000 reduction in annual operating costs from energy efficiency.

Read Evidence of Rational Market Valuations for Home Energy Efficiency by Rick Nevin and Gregory Watson for the US EPA.