Every emission factor. Sourced. Dated. Free.
A reference library of greenhouse-gas emission factors with full provenance, citation formats, and vintage tracking. Built for sustainability professionals who need auditable numbers.
UK grid electricity
- fuels factors
- 280
- unit families
- 81
- primary source (DEFRA 2025)
- 1
- hallucinations, every value cited
- 0
Search, cite, verify.
Every factor page shows the value, the source, the methodology, and a machine-readable citation block. Vintage supersession is tracked automatically.
Methodology, explained in plain English.
Every factor carries the context an auditor expects. We write short methodology notes in language practitioners can use directly in disclosures, without guessing what a standard actually requires.
Location-based methodology
A location-based factor reflects the average emissions intensity of the electricity grid in a defined geography. It ignores any contractual instruments (renewable certificates, PPAs) held by the reporter.
Under GHG Protocol Scope 2 Guidance, organisations must report both a location-based and a market-based figure. Use this factor for the location-based view.
What practitioners ask first.
Yes. The reference is free with no sign-up. Optional account features (saved factors, cite lists, search history) are also free. Paid tools sit in a separate workspace product, not here.
Every factor is dual-verified by two editors at ingestion. Each is re-checked against its source annually. The last verified date is shown on every factor page and must be under 13 months old to be marked current.
Every factor page has a Report an issue button. We respond within five business days. Confirmed corrections are logged in the public changelog on the factor page with a timestamp and editor note. We never silently edit values.
Auditability. If you reported using DEFRA 2023 last year, that factor must remain accessible at the same URL forever so an auditor can verify your prior inventory. New versions sit alongside the old ones with a supersession banner.
Probably. We prioritise sources that real practitioner search demand surfaces. Suggest a source through the Report an issue button on any page and we will weigh it in the next sprint.