In January 2011 my new massive (7.6 kw) solar system was installed. While I am an environmentalist at heart and always have been, I also did this as an investment. I figured if the government wants to throw money into solar I might as well be on the receiving end. Fed paid 30% of the total cost, state paid almost another 30%, I will not have any more electric bills for the next 30 years, in fact I will get money back from my utility company, and I even generate renewable energy credits which the state government forces the utility companies to purchase from me. Overall, it should be a decent return on investment which will become even more valuable if we have higher future inflation.
NBC 10 (local news) did a story featuring my house called "Make Money by Going Solar?":