The invoice for the install was 34K. You get back 33% from the fed. ~25% from the MA rebate, and another $1K back from MA taxes. I only had to write a check for the 34K minus the MA rebate (which MA writes a check to the installer before the work starts) so ~25K, but with the other tax rebates (already modified my W4 so "getting back" the fed 33% right now and not waiting until next April) the total I have to invest will be ~15K.

More notes on the whole install

http://benjamin-meyer-home.blogspot.com/2011/08/solar-panels...

http://benjamin-meyer-home.blogspot.com/2011/08/solar-panel-...