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What does the (-W) on my net meter mean?

This is the 2nd read on your meter. This figure is measuring the amount of energy (in kWh) passing from your home back through the meter and onto Unitil’s infrastructure. It is important to note that this figure does not directly measure the amount of electricity generated by your facility. As your facility generates energy, your home is drawing from that power before it reaches the meter. This reading is only measuring the surplus energy that leaves your home without being used.