Energy Use Intensity, commonly abbreviated as EUI, is a metric that expresses a building’s annual energy consumption relative to its size. It is typically calculated by dividing the total energy consumed by a building in one year (measured in kBtu or GJ) by the building’s gross floor area (measured in square feet or square meters). For example, a building consuming 500,000 kBtu annually with a gross floor area of 10,000 square feet would have an EUI of 50 kBtu/sq ft. This resulting value provides a standardized measure for benchmarking energy performance.
This normalized energy consumption value allows for comparisons of energy efficiency across different buildings, regardless of size or operational characteristics. A lower value generally indicates better energy performance and reduced operating costs. Understanding a building’s energy consumption characteristics has implications for cost savings, carbon footprint reduction, and compliance with energy efficiency regulations. Historically, the development and utilization of this metric have driven improvements in building design and energy management practices, fostering a greater emphasis on sustainable building operations.
