Purpose of this article
This article explains how Energy Use Intensity (EUI) is calculated in Scaler, how floor area and consumption inputs are applied, and how EUI should be interpreted in analytics and portfolio comparisons.
What is Energy Use Intensity (EUI)?
Energy Use Intensity (EUI) measures total energy consumption relative to building size.
EUI is typically expressed as:
- kWh per square meter per year, or
- kBtu per square foot per year
EUI is a key indicator of operational energy efficiency, allowing comparison between assets of different sizes. Use EUI to monitor efficiency improvements, identify outliers, and track the impact of retrofit measures. Interpret alongside data coverage—gaps in data can distort results. Seasonal and asset turnover effects may influence year-to-year change.
How EUI is calculated in Scaler
In Scaler, EUI is calculated as:
=Total_energy_consumption / Active_floor_area
(kWh/area²/year)EUI is calculated on an annualized basis and may reflect normalization or estimation depending on the selected analytics view.
Active floor area
Active floor area represents the portion of floor area that is covered by meters included in calculations.
Active floor area is defined as:
- Floor area linked to meters marked as
Active
- Meters marked as
Included in calculations
- Capped at the total floor area of the relevant
Area type(e.g. whole building)
Meters of the same resource type are assumed not to overlap in coverage.
Asset-level EUI
At the asset level:
- Total energy consumption is calculated from included meters
- Active floor area is derived from meter-to-area mappings
- EUI reflects how efficiently the asset uses energy relative to its size
Asset-level EUI is sensitive to:
- Data coverage
- Floor area configuration
- Meter inclusion settings
Where this appears:
- Asset-level view
- Asset-bar graphs at Portfolio-level view
Portfolio-level EUI
At the portfolio level:
- EUI is calculated as the average of asset-level EUI values
- Each asset contributes equally to the portfolio average
Portfolio-level EUI supports:
- Portfolio benchmarking
- Trend analysis
- Target setting and comparison
Where this appears:
- Portfolio-level view, Annual line graph
- Company-level view comparing portfolios within company account
