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What is one-to-one net-metering?

If the system produces more electricity than needed, the excess electricity will be given to the public power supply (Grenlec). The meter then spins backwards.

If the system produces less electricity than needed, the shortage will be taken from the public power supply (Grenlec). The meter then spins forward.

At month’s end the give and take will be balanced out, hence the electricity bill will be reduced by the amount the system produced.