Question-and-Answer Resource for the Building Energy Modeling Community
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(I am posting the comments as an answer). Total Source Energy (="represents the total amount of raw fuel that is required to operate the building. It incorporates all transmission, delivery, and production losses" Source: EPA). In contrast, the Net Source Energy is the energy that you get after the losses of delivery and transportation. In your example, the difference is between the total and net source energy. There is no difference between total and net site energy. There would have been a difference if you had energy generation (but in this example you don't have any PVs installed, etc).
