Net Metering is a solar incentive that allows homeowners with solar to store energy in the electric grid. When your solar panels produce excess power, that energy is sent to the grid. You can pull this energy from the grid when your system is under producing such as nighttime. This allows you, with the right sized system, to produce enough electricity to match your home's use for an entire year. This is great in a state like South Carolina where there are some cloudy days. On these days, you can use power stored in the grid.