AKA: KWH meter, utility meter
Most homes with a grid-tied solar-electric system will have AC electricity both coming from and going to the electric utility grid. A bidirectional KWH meter can simultaneously keep track of how much electricity flows in each of the two directions—just the information you need to monitor how much electricity you’re using and how much your solar-electric system is producing. The utility company often provides Intertied-capable meters at no cost.
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