What is the ET curve and how does it work?

The ET curve (Energy/Temperature curve, also called an energy signature) is a scatter plot that shows the relationship between your building's weekly energy consumption per m² and the outdoor temperature. It helps you understand how weather-dependent your building's energy use is.

How it works

1. The system fetches weekly energy consumption from your selected meters and divides by the building's total area (BRA) to get kWh/m² per week.
2. It fetches outdoor temperature data for your building's location and calculates a weekly average temperature.
3. Each week becomes a dot on the chart: X-axis = average outdoor temperature (°C), Y-axis = energy consumption (kWh/m²/week).

What you see on the chart

• Scatter dots colored by year (current year in cyan, previous year in violet, older in green/amber). Recent weeks (last 4) are highlighted with a red ring.
• Baseline (purple line): A linear regression computed from all data points. This is your building's average energy response to temperature.
• ±N% bands (orange upper, green lower): Configurable deviation bands around the baseline (default ±10%). Points outside these bands are weeks where consumption was unusually high or low.

Controls

• Period: Choose 6 months, 12 months, or 24 months of data.
• Baseline toggle: Show or hide the regression line.
• Bands toggle: Show or hide the ±% deviation bands.
• Meter selector: Choose which energy meters to include. Defaults to building-level meters.

Where: Analytics → Energy, then switch the view toggle at the left of the toolbar to ET Curve (select a building from the dropdown first).