Business Carbon Footprint Calculator 2025/26

Approximately 0.207 kgCO2e/kWh in 2023 — it has fallen dramatically as renewables grow and continues to fall annually. DEFRA publishes updated conversion factors each June. Always use the current year's factor for compliance reporting, as using an outdated factor will overstate your Scope 2 emissions. By 2030, the grid is expected to be largely decarbonised, making purchased electricity close to zero-carbon.

Scope 1: direct emissions from your own operations — gas boiler, company-owned vehicles, refrigerant leaks. Scope 2: indirect emissions from purchased electricity (based on the grid carbon factor). Scope 3: all other indirect emissions — supply chain purchases, business travel in non-company vehicles, waste, employee commuting, upstream and downstream transport. Scope 3 typically accounts for 70-90% of a business's total footprint and is the hardest to measure.

Mandatory for UK quoted companies and large unquoted companies (over 500 employees) under SECR (Streamlined Energy and Carbon Reporting); mandatory for large companies to report under TCFD (Task Force on Climate-related Financial Disclosures). Voluntary but expected for SMEs in many supply chains — major UK corporates increasingly require Scope 3 supplier data. The UK government's Net Zero Strategy targets mandatory climate disclosures across the economy by 2025.