In our experience smart homes use lots of electricity. Perhaps this is a model to at least reduce electricity costs and their associated impacts on the environment…
A ZEH is connected to the utility grid, but at off-peak time periods, it generates more power than it uses by combining renewable energy technologies with advanced energy-efficient construction. As a result, a ZEH lowers the power demand on its utility provider. It produces about as much energy as it consumes during a year, so it is considered to achieve “net zero” energy consumption.”
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