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Wow! thats great. Congraulations, its not everyday that this happens. Theres only one thing that might even come close to watching the meter spin backwards and thats occasionally getting to watch a meter reader go round and round my house scratching his head looking for the electric meter and there isn't one.
Lets see thats 12 at 165 watts for about 4 hours a day averaged over the year. That would come too about 8 kilowatthours a day. More in the summer, less in the winter of course. I would say around 60% of the year for a grand total of 1,700 kilowatthours a year at $0.08 a kilowatthour (national average) thats $136.00 a year! Thats like a free month of electricity every year.
Hey, I wonder if the power company here would pay me that much a year as long as I dont every hook up to there coal fired generators or nuclear power plant.
There's a web site where you can see just how much pollution that PV array will offset.
http://www.cleanerandgreener.org/pollution-from-electricity.htm