Around these parts Gulf Power works with solar companies to solicit door-to-door for customers to install solar (not off the grid, but connected to it). They survey your electric bills, and work up an estimate to install solar panels on your home sufficient for your usage to be neutral. I would be connected to the power grid, and the meter turns both directions. At the end of the year, if I'm in a deficit, I owe Gulf power whatever that's worth. If I'm in surplus, Gulf Power gets that for free. HOWEVER, the system isn't free. The cost estimate for me was around $25K on a 20-year loan. The payments on that loan are equal (+/-) to my average monthly electric bill. But if my system happens to last longer than that 20 year loan, I get free electricity for however long they last. The panels they tried to sell me have a 25 year warranty.