Because the cost of grid electricity includes the comfort of having it 24/7. Solar is damn cheap, but you can rely on it perhaps 10% of the time (0 hours in ver

Because the cost of grid electricity includes the comfort of having it 24/7. Solar is damn cheap, but you can rely on it perhaps 10% of the time (0 hours in very cloudy days up to 4-5 hours a day in the summer). There is some way to do some arbitrage even without net metering (charge your car during the day, install batteries) but solar alone is by far not enough to leave the grid.