# What should we check ourselves before an external verifier looks at our emissions?

Canonical: https://senseible.earth/answers/internal-review-before-external-verification

Run the checks a verifier would: totals match the invoices, units are right, factors are from the right year, every month is there and estimates are labelled. A one-day internal review usually finds the errors that would otherwise come back as findings and cost a second round.

## The checklist

- Twelve months of bills and invoices for every source.
- Units: kWh not kVAh, litres not kg, SCM not MMBTU unless converted.
- Factors: source and year stated.
- Fuel used, not just bought.
- Estimates marked with the method.

## Sense checks

- Emissions per tonne of output against last year.
- Litres per unit for DG sets.
- Fuel per tonne of steam for boilers.

## Who does it

Someone who did not prepare the figures, even a colleague from accounts.

## What Senseible does here

Senseible keeps every figure linked to its source invoice or bill with a fingerprint, so a verifier can trace a total back to the documents it came from.

- [Verifier findings](https://senseible.earth/answers/verifier-finding-corrective-action-what-to-do)
- [Estimation note for a verifier](https://senseible.earth/answers/estimation-note-for-verifier)
- [kVAh vs kWh](https://senseible.earth/answers/billed-units-vs-meter-reading-for-emissions)

Sources: [ISO 14064-1, 14064-3 and 14067 (iso.org)](https://www.iso.org), [GHG Protocol Corporate Standard](https://ghgprotocol.org/corporate-standard), [GHG Protocol standards](https://ghgprotocol.org/standards)

Last reviewed 2026-10-22.