DJU Normalization
How weather-adjusted consumption works and why it matters.
DJU (Degres Jours Unifies / Unified Degree Days) normalization adjusts energy consumption data to account for weather conditions, giving you a fair comparison across different time periods and locations.
Why normalize?
A building uses more energy in winter for heating and more in summer for cooling. Without normalization, comparing January consumption to March consumption is misleading because the weather was different. DJU normalization removes the weather effect so you can see true operational efficiency changes.
How it works
Weather data collection [step]
Outdoor temperature is collected for each site's location.
DJU calculation [step]
Degree days are computed based on the difference between outdoor temperature and a reference temperature (typically 18°C).
Normalization [step]
Consumption is divided by DJU to produce a weather-adjusted metric (kWh/DJU).
When to use it
Good use cases
- Comparing the same site across seasons — see if efficiency improved year-over-year
- Comparing sites in different climates — benchmark a site in Lille against one in Marseille
- Tracking energy efficiency projects — measure the real impact of insulation or HVAC upgrades
When NOT to use it
- Sites with no weather-sensitive loads — if a site is mostly data center or process equipment, weather normalization adds noise rather than signal
- Very short periods — DJU normalization works best over weeks or months, not hours
Enabling DJU normalization
Toggle the Corrige DJU switch on the Consumption page or Comparison page toolbar. Charts will update to show normalized values (kWh/DJU) instead of raw consumption (kWh).