Net metering allows you to earn credits for surplus power generation. Your meter will compare the electricity you generate to the amount you consume. Any excess electricity will flow out into the grid, and credit your utility account. You are only billed for the “net” amount of energy used.
This incentive helps balance the naturally occurring highs and lows of solar production with your energy use. Net metering means your extra solar output during daylight hours can help pay for the energy you use at night.
In Massachusetts, you are able to net meter up to 125% of the power you use on site, and transfer the surplus credits to another meter in the state.