At times, your solar energy system will produce more electricity than you can use, and the surplus electricity is returned to the utility grid to be used by other consumers. The amount of electricity your home pulls from the utility grid is tracked by your electric meter which spins forward for each kilowatt hour used. When your solar energy system returns electricity to the utility grid, your electric meter will actually spin backward. This process is called “net metering,” and it effectively counts and bills you for the net amount of electricity that you have pulled from the grid.
Most states and utilities offer net metering.