Tools and Resources
Commercial buildings all use different mixes of energy including electricity, natural gas, fuel oil, district steam, and many others. To evaluate energy performance for these buildings, we have to express all of these different energy types in a single common unit. Source energy is the most equitable unit of evaluation, and enables a complete assessment of energy efficiency.
For consistency and comparability, all energy performance metrics in Portfolio Manager reports are expressed in either thousand British thermal units (kBtu) or billion joules (GJ) and are annualized to 12 calendar months. However, in most cases your energy bills are not presented in these units and are not tied to calendar months. Therefore, a series of procedures is applied to make these conversions.
Portfolio Manager offers three main meter types, based on the most common ways buildings receive energy:
When you benchmark your building in Portfolio Manager, one of the key metrics you’ll see is energy use intensity, or EUI. Essentially, the EUI expresses a building’s energy use as a function of its size or other characteristics.
For most property types in Portfolio Manager, the EUI is expressed as energy per square foot per year. It’s calculated by dividing the total energy consumed by the building in one year (measured in kBtu or GJ) by the total gross floor area of the building.
This 5-page background document summarizes the process for verifying applications for ENERGY STAR certification. It also addresses the rationale for requiring that only licensed professionals (professional engineers and registered architects) can verify and stamp applications, and solicits input on this requirement. The deadline for submitting comments has closed. Thank you for your feedback.