For a building to have a net energy usage of 0, it would have have to produce as much energy as it uses. The best way to do this would be to have some sort of alternative energy like windpower or a solar energy system that provides energy to the building. Nowadays it isn’t uncommon for buildings to put in these systems in an attempt to reduce energy costs and help the environment. Otherwise, the only way to do it would be for the building to use no energy at all, and thus have no electricity in it whatsoever.
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