In 42 of the 50 biggest U.S. cities, rooftop solar is now cheaper than the grid!

Pennies falling from the sky, you just have to pick them up

The price of electricity from the grid is going up over time and the price of electricity from solar panels has been going down rapidly for decades.
http://www.treehugger.com/renewable-energy/42-of-50-biggest-us-cities-rooftop-solar-now-cheaper-grid.html