"yeah, but how long before you see a return on investment?"
how about instantly?
this is what we did:
1) calculated our monthly electricity payment: $160 or so a month.
2) priced out solar to push our payment to net-zero-ish: the savings really start multiplying once you get down into the regulated tiers.
3) replaced our electricity bill with a solar installation loan.
what did we get in return?
instant insulation from rate hikes: http://business.time.com/2011/12/16/plugged-in-then-pay-up-e...
instant equity on our house.
oh, and look! i can now have a solar-powered car!
but yeah, if i happen to still live in this house in 15 years, sure, no electricity bill. and, i'm sure somewhere along the line i'll end up "making all my money back".