“How does California specify how all building loads must be measured?”
Most areas of the developed world have stringent building energy standards that include analysis for measurement. And as such, California is no exception. But it does so in a very special way. California title 24 (the building energy codec) stipulates that all new buildings must sort their energy loads (HVAC, lighting, etc.) into discrete piles in a method known as Disaggregated Measurement. This way, each subset can be monitored for its energy consumption.