What is Energy Intensity?
An explanation of energy intensity as a business metric — how it is calculated, why it is more useful than absolute energy consumption for tracking efficiency, and how SMEs can use it.
Key Takeaways
- Energy intensity measures energy consumption relative to a unit of output, such as revenue or production volume.
- It is more useful than absolute consumption for tracking efficiency improvements as a business grows.
- Reducing energy intensity cuts costs, lowers your carbon footprint and improves ESG credentials.
What energy intensity measures
Energy intensity is a ratio that expresses how much energy your business consumes relative to a measure of output or activity. Common denominators include revenue (kWh per £1,000 of turnover), floor area (kWh per square metre), production volume (kWh per unit produced) or headcount (kWh per employee). Using a ratio rather than an absolute figure makes it possible to compare energy efficiency across different time periods even as your business grows, and to benchmark against industry peers of different sizes. A declining energy intensity ratio indicates that you are producing more output per unit of energy — a genuine efficiency improvement.
Why it matters more than absolute consumption
Absolute energy consumption figures can be misleading for a growing business. If your revenue doubles but your energy use only grows by 30%, absolute consumption is up but energy intensity has fallen significantly — meaning you are operating more efficiently. Conversely, if your energy use falls slightly but revenue falls more sharply, your intensity may have worsened. For ESG reporting purposes, most frameworks accept intensity metrics alongside absolute figures, because they provide a more meaningful picture of operational efficiency trends. SECR (Streamlined Energy and Carbon Reporting) regulations, which apply to large UK companies, require both absolute and intensity figures.
How SMEs can track and improve it
Tracking energy intensity requires two data sources: your energy consumption (from utility bills or smart meters) and your chosen output metric (from your accounting system). Calculate the ratio monthly or quarterly and plot it over time. Common improvement actions include: installing LED lighting and smart heating controls; improving insulation; optimising production scheduling to avoid peak tariff periods; investing in more energy-efficient equipment; and monitoring sub-metered areas to identify waste. Many SMEs find that simply installing sub-metering and displaying energy data to site staff reduces consumption by 5–10% through behavioural change alone — no capital investment required.