Intensity Metric
An intensity metric (or intensity ratio) expresses greenhouse gas emissions relative to a unit of business activity — such as tCO₂e per million pounds of revenue, per employee, per square metre, or per unit of production. It enables normalised comparison of emissions performance across years and between organisations of different sizes.
What is Intensity Metric?
An intensity metric contextualises absolute emissions by relating them to a measure of business output or scale. While absolute emissions (total tCO₂e) tell you the total climate impact, intensity metrics tell you how efficiently an organisation operates from a carbon perspective. A company can grow its revenue while reducing its emissions intensity, demonstrating decoupling of economic activity from carbon output.
SECR requires qualifying companies to report at least one intensity ratio alongside their absolute emissions and energy consumption. Common intensity metrics include: tCO₂e per £ million revenue (widely used across sectors), tCO₂e per employee or per full-time equivalent (FTE) (useful for service-sector businesses), tCO₂e per square metre of floor space (used in property and facilities management), and tCO₂e per unit of production (used in manufacturing, e.g., per tonne of product, per vehicle produced).
The choice of intensity metric should reflect the primary driver of the organisation's emissions and be meaningful for its sector. A property company would choose tCO₂e per m², because floor area is the main determinant of energy consumption. A professional services firm might choose tCO₂e per employee, because headcount drives office space, travel, and IT demand. A manufacturer would choose tCO₂e per unit of output to track production efficiency.
Intensity metrics are particularly useful for year-on-year comparison when an organisation is growing, shrinking, or restructuring. If absolute emissions increase by 10% but revenue increases by 25%, the intensity metric has improved — the business is growing faster than its emissions. Conversely, a reduction in absolute emissions during a downturn does not necessarily indicate decarbonisation progress; the intensity metric provides a clearer signal.
The Science Based Targets initiative allows some targets to be set on an intensity basis (e.g., reduce Scope 3 emissions per unit of revenue by 30%) when absolute targets are less practical — particularly for Scope 3, where emissions are influenced by business growth and supply chain scale. However, SBTi near-term targets for Scope 1 and 2 must be absolute, not intensity-based.
Practical Examples
A UK law firm reports an intensity metric of 2.8 tCO₂e per employee in its SECR disclosure, down from 3.5 tCO₂e per employee in the base year — demonstrating a 20% improvement in carbon efficiency per head despite growing from 500 to 650 staff.
A commercial landlord tracks tCO₂e per square metre across its portfolio, enabling it to identify the least efficient buildings for retrofit investment and benchmark individual assets against the portfolio average.
A food manufacturer uses tCO₂e per tonne of finished product as its primary intensity metric, allowing it to isolate efficiency improvements from volume changes and set meaningful production-line-level reduction targets.
How Climatise Helps
Climatise calculates intensity metrics automatically from your emissions data and business activity figures (revenue, headcount, floor area, production volume). The platform tracks intensity trends over time, benchmarks against your base year, and includes the required intensity ratio in SECR and CRP report outputs.
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