How do I calculate consumption to property susceptible to occupation?

We purchased and attempted to net-zero power is what we identified: query Rubber Ducky : How do I calculate a probability of consumption of buildings on the occupation I am designing a hypothetical constructing in Extended Beach, California. It is a net-zero energy, green developing its education center. I require to know how much kWh that I am in a position to do to give energy to other forms of power production. My occupancy is around 400-500 men and women. How do I calculate how many kWh

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