Thanks to John Price for putting this together.

Net-Zero Site Energy — A building that produces and exports at least as much renewable energy as the total energy it imports and uses in a year, when accounted for at the site. The measurement time frame is annual.

Net-Zero Source Energy — A building that produces and exports at least as much renewable energy as the total energy it imports and uses in a year, when accounted for at the source. "Source energy" refers to the primary energy required to generate and deliver the energy to the site. To calculate a building's total source energy, imported and exported energy is multiplied by the appropriate site-to-source conversion multipliers.

Net-Zero Energy Costs — A building where the amount of money a utility pays the building's owner for the renewable energy the building exports to the grid is at least equal to the amount the owner pays the utility for the energy services and energy used over the year.

Net-Zero Energy Emissions — A building that produces and exports at least as much emissions-free renewable energy as it imports and uses from emission-producing energy sources annually. Carbon dioxide, nitrogen oxides, and sulfur oxides are common emissions that NZEBs offset.

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