ENERGY STAR Score for Offices

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The ENERGY STAR Score for Offices applies to office, bank branch, financial office, and courthouse property types. The objective of the ENERGY STAR score is to provide a fair assessment of the energy performance of a property relative to its peers, taking into account the climate, weather, and business activities at the property. To identify the aspects of building activity that are significant drivers of energy use and then normalize for those factors, a statistical analysis of the peer building population is performed. The result of this analysis is an equation that will predict the energy use of a property, based on its experienced business activities. The energy use prediction for a building is compared to its actual energy use to yield a 1 to 100 percentile ranking of performance, relative to the national population.

  • Property Types. The ENERGY STAR score for offices applies to four property types: office, financial office, bank branch, and courthouse. The score applies to individual buildings only and is not available for campuses.
  • Reference Data. The analysis for offices is based on data from the Department of Energy, Energy Information Administration’s 2003 Commercial Building Energy Consumption Survey (CBECS).
  • Adjustments for Weather and Business Activity. The analysis includes adjustments for:
    • Building Size
    • Number of Personal Computers
    • Number of Workers
    • Hours of Operation per Week
    • Weather and Climate (using Heating and Cooling Degree Days, retrieved based on Zip code)
    • Percent of the Building that is Heated and Cooled
    • Whether or not the building is a Bank Branch (Smaller banks show different performance)
  • Release Date. The ENERGY STAR score for offices is updated periodically as more recent data becomes available:
    • Most Recent Update: October 2007
    • Previous Update: January 2004
    • Original Release: January 1999

This document presents details on the development of the 1 - 100 ENERGY STAR score for office properties. More information on the overall approach to develop ENERGY STAR scores is covered in our Technical Reference for the ENERGY STAR Score, available at The subsequent sections of this document offer specific details on the development of the ENERGY STAR score for offices.

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