Activity-Based Emission Calculation: Definition & Explanation for ESG Reporting
Activity-based emission calculation is the accurate method for measuring greenhouse gas emissions based on real physical activity data rather than financial proxies—such as kilowatt-hours, litres of diesel, or tonnes of steel—ensuring robust ESG reporting and sustainability compliance.
How the Activity-Based Approach Works
Instead of financial data, this method utilises concrete consumption metrics, such as kilowatt-hours of electricity, litres of diesel, kilometres driven, or tonnes of steel purchased. These quantities are multiplied by precise, often supplier-specific emission factors to calculate the total carbon footprint.
Sourcing Supplier Data for ESG Reporting
Data availability varies by supplier. To ensure robust ESG reporting, companies should engage with suppliers to request either a Corporate Carbon Footprint (CCF) or a Product Carbon Footprint (PCF). If suppliers cannot provide this sustainability data, the spend-based approach serves as a viable alternative.
Advantages and Disadvantages
Strengths: Highest level of accuracy; captures actual sustainability performance and comprehensive greenhouse gas (GHG) inventories.
Weaknesses: Limited data availability and significant administrative effort required for data collection.
The Hybrid Approach in Practice
ESG Lift utilizes a hybrid approach, integrating actual emissions data where available and facilitating a seamless transition from spend-based to activity-based calculations for key emission sources to enhance your ESG reporting accuracy.