Before the visit
- Last 12 months of fuel bills (gas, coal, diesel, furnace oil).
- Last 12 months of electricity bills.
- Production records by product, with the CN code you ship to the EU under.
- Monitoring plan (even a simple one) covering boundary, flows, measurement points and expected calculation routes.
- Any lab certificates for fuels (NCV, carbon content).
- Procurement records for precursors (unwrought aluminium, billets, crude steel) and their origin.
On the visit
- Walk the verifier through the boundary of the installation: where fuels enter, where products leave.
- Point at every meter they will reference.
- Show the operator panel/log that produces the production numbers.
- Keep raw receipts, not just the summary spreadsheet. The verifier will spot check.
After the visit
The verifier will issue a verification opinion. Only once it says “positive” can your actual numbers be used in your buyer’s declaration. If the first year’s visit went well, the next year can be remote.
This is a practical checklist, not a legal one. The authoritative list of what verifiers check lives with your verifier and the Commission’s verification guidance.