Carbon Project Documents Buyers Receive and How to Check Them

Before any contract, we share four project documents with qualified buyers: the Project Design Document, the validation report, the verification report and the registry issuance record. Together they show what the project claims to do, whether an independent auditor agreed it could work, whether it actually delivered, and how many credits the registry created as a result.

You do not need to be an engineer to review them. You need to know what each one is for and which pages to turn to. This guide covers that, along with the warning signs that should make you pause.

One principle runs through all of it: the registry, not our desk and not the seller, is the official record of issuance and retirement. Where a document and the public registry disagree, the registry wins.

Project Design Document (PDD)

The PDD is the project's founding description, written by the developer and registered with the programme. It sets out:

• where the project is and what it physically does
• the methodology it follows
• the baseline, meaning what would have happened without the project
• why the project is additional, meaning it would not have gone ahead without carbon revenue
• the monitoring plan: what is measured, how and how often
• the expected emission reductions or removals each year
• how risks to local communities and the environment are handled

What to look for. Check that the location, technology and methodology match the marketplace listing and the registry page. Read the additionality section and ask whether the argument is convincing for the project and the place. A large grid-connected solar plant in a state where solar is already the cheapest option will need a stronger case than a biogas unit in a village with no alternative energy supply.

Warning signs. A PDD for a different project size or location than the listing describes; a methodology version that has since been withdrawn without any note of a transition; expected annual reductions that look far higher than comparable projects.

Validation report

Validation happens before or near the start of crediting. An independent auditor, called a validation and verification body (VVB), reviews the PDD and confirms that the project design meets the programme's rules and the methodology is applied correctly.

What to look for. The auditor's name and accreditation, the date, and the conclusion. Read the list of findings. Auditors raise "corrective action requests" and "clarification requests" during their review; a good report records each one and explains how it was closed.

Warning signs. Findings that were closed with little explanation; a qualified or conditional opinion; a validation that is very old with no later review, especially where the methodology has changed in between.

Verification report

Verification is the check that matters most for the credits you are buying. After a monitoring period, the developer submits a monitoring report with the measured results. A VVB then reviews the data, often with a site visit, and confirms how many tonnes were actually reduced or removed.

Projects are verified repeatedly over their life, so there may be several verification reports. Ask for the one covering the monitoring period that produced your vintage.

What to look for. The monitoring period dates, the verified quantity, and whether that quantity matches what was issued. Look at whether the auditor visited the site, and at any deviations from the monitoring plan, such as a broken meter or missing survey data, and how they were handled. For cookstove projects, check how usage was surveyed. For forestry, check how biomass was sampled.

Warning signs. A verified quantity well below the PDD estimate with no explanation; a long gap since the last verification; the same auditor having been sanctioned or suspended by the programme; deviations that were accepted without adjustment to the credited amount.

Registry issuance record

The issuance record comes from the registry itself. It shows the date credits were issued, the quantity, the vintage and the serial number range. For a forward lot there will be no issuance record for your credits yet, though earlier issuances for the project may exist.

What to look for. Match the serial range to the units being offered to you. Confirm the vintage. Then go to the registry's public website, search the project ID, and check that the same issuance appears and that the units offered have not already been retired or cancelled. Verra, Gold Standard and Global Carbon Council each run public registry pages for this; you can start from verra.org, goldstandard.org or globalcarboncouncil.com. Carbon registries and serial numbers walks through a search step by step.

Warning signs. Serial numbers that do not appear on the public registry; units shown as retired; a project marked inactive, on hold or under review.

How the four fit together

Read in that order, they tell a consistent story or they do not. A common problem in the market is not forgery but drift: a project that has changed in size, ownership or methodology since its PDD, without the later documents explaining it clearly.

Extra documents for specific buyers

Airlines buying for CORSIA will also need evidence that the units are eligible for the relevant compliance period, including, for current periods, the host country's letter of authorisation and confirmation of the corresponding adjustment. Our CORSIA eligible units checklist lists what to request. Companies with their own procurement rules may ask for ownership evidence or a sanctions check on the seller; tell us at the start so your requirement is clear from the first enquiry.

When you have shortlisted a lot and want to see its document set, send a request to buy from the project page and we will share the files for your review before anything is signed. The step-by-step buying guide shows where this sits in the wider process.