Net metering facilitate their customers to sell excess solar energy back to the grid to reduce their bills. One can eliminate all monthly electric costs if solar system is sized properly. As we know that solar panels complete;t depends on sunlight rays, thus solar panels generate mostly electricity during daytime. People uses least amount of electricity during the middle of the day. Hence, your solar panels keep generating more electricity than your home needs at that time.
When solar panels produces more electricity than home needs, then excess solar energy sent back to the grid. Here, net energy metering comes into existence. when net metered system sends solar energy to grid, then electricity meter spins backwards and utility applies a credit for retail value of electricity.To know the benefits of net energy metering, have a look!
Reference: https://www.reddit.com/user/climatesolarnowus/comments/qpc52f/net_energy_metering/