Zero Energy Performance Index (zEPI)

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Zero Energy Performance Index (zEPI) is a value that represents the ratio of energy performance of a proposed building design compared to the average energy performance of buildings with similar occupancy and climate types, benchmarked to the year 2000. It is the ratio of a proposed building’s EUIp to the EUI of a baseline or reference building model, multiplied by 100 to give a scalar value, which can range from zero (for a zero energy building) to 100 (for a building that uses the same amount of energy as the baseline model).

The lower the value, the better the energy performance. The 2012 International Energy Conservation Code (IECC) requires a zEPI of 57; the 2012 International Green Construction Code (IgCC) requires a zEPI of 51, which represents a 10% increase in efficiency over the 2012 IECC.

Source: An Architect’s Guide to Integrating Energy Modeling in the Design Process. 2012. The American Institute of Architects.

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