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Performance-based designs shall demonstrate a zEPI of not more than 51 as determined in accordance with Equation 6-1 for energy use reduction and shall demonstrate a CO2e emissions reduction in accordance with Section 602.2 and Equation 6-2 for CO2e.
zEPI = 57 × (EUIp/EUI) (Equation 6-1)
where:
EUIp = the proposed energy use index in source kBtu/sf-y for the proposed design of the building and its site calculated in accordance with Section 602.1.2.
EUI = the base annual energy use index in source kBtu/sf-y for a baseline building and its site calculated in accordance with Section 602.1.2.

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