Generally, the law mentioned earlier, is relative to something known as ‘net-metering’. The fact that you produce during the day, allows you to consume during the night. This is the ‘net’ in ‘net-metering’. If I recollect correctly, the ‘net-metering’ period is one month. If the net between consumed and produced is zero… then you don’t have a bill (other than misc connect charges/fees etc).
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Our neighbors are billed annually for the net electrical.
During the summer they produce more than they use. During the winter they use more than they produce. (We’re semi-coastal and 1960’s construction – so only one house in our ‘hood has AC).