Net metering is a billing method that credits solar power system owners for the electricity they add to the grid.
For example, during the day a homeowner’s solar power system may generate more electricity than their home uses. This excess electricity feeds into the grid to be used by other customers. With net metering, the electricity meter will run backwards, providing a credit to the homeowner. This credit can then be used at night when the solar power system is not generating electricity. At the end of the month the homeowner is only billed for their "net" energy usage.