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"I know several people who have installed solar power systems. I question the economics some of them are getting. Paying $25k-$30k ($15-$18 after tax credits) for a system, without borrowing the money, will result in a ~12-15 year simple payback. If you borrow the money, it adds on another 3-5 years. I wonder how many of those people will still be in their home after 20 years"I'm with you. Were those people's systems installed by commercial dealers? Their plan is just to get you to break even over the life of the system so you can feel good about "being green"