Energy use is benchmarked using EPA’s Portfolio Manager.
Portfolio Manager tracks energy meters based on the energy source. There are several types of energy meters available:
Energy use is measured in kBtu’s. This data comes from utility bills that are entered into Portfolio Manager. The calculated kBtu is then divided by the building’s square footage. The result is the building’s Energy Use Intensity (EUI).
To calculate the energy percentage difference over the competition year, the weather normalized EUI from the previous year is subtracted from the weather normalized EUI of the current year. The calculated difference is how we determine the biggest losers.
EUI = kBtu’s/square footage
Current Year – Prior Year = % lost or gained