zEPI: charting the path to net zero
Blog post by Helen Sanders, Ph.D
The New Buildings Institute (NBI) has recently asserted that 2019 is the year of the energy code, stating that “there will be a convergence of activities around energy codes that will make or break our ability to reduce the amount of carbon emitted by buildings in the next most crucial decade.” We’ll take a deeper dive into what’s behind this statement next month, but first we need to understand the concept of “zEPI,” an abbreviation for Zero Energy Performance Index.
zEPI is a concept that has been championed by the NBI (and created by Charles Eley) as a way of providing a clearer view of the pathway to net zero energy buildings and to achieving the Architecture 2030 goals. It is unique in that it references performance to a static baseline – the 2003 Commercial Buildings Energy Consumption Survey (CBECS), which provides an assessment of the energy use intensity (EUI) of buildings in the year 2000.