Low-carbon methanol
ISCC certification and mass balance
When the low-carbon product is molecularly identical to the conventional one, certification is not paperwork around the purchase. It is the purchase.
When the low-carbon product is molecularly identical to the conventional one, certification is not paperwork around the purchase — certification is the purchase. Everything you are paying extra for lives in a chain of custody you cannot see and did not witness.
That makes it worth understanding properly, because the difference between a claim that survives an audit and one that does not is entirely in details that a supplier has no particular incentive to volunteer.
Key points
- ISCC PLUS is the scheme most commonly used for certified bio-methanol in non-fuel applications.
- Mass balance means certified and conventional material are physically mixed and the certified volume tracked administratively.
- Mass balance is legitimate and widely accepted — but not universally, so check your own reporting framework first.
- Every credible claim has three components: scheme, certificate reference, and greenhouse gas figure with its boundary.
- “Green methanol” has no fixed technical definition and should never be accepted in place of a named scheme.
What mass balance actually means
Certified and conventional methanol are chemically identical, so once they enter a shared tank, pipeline or vessel they cannot be separated or distinguished. Physically segregating certified material through the entire supply chain is possible but expensive, and would require dedicated tankage and logistics at every step.
Mass balance solves this administratively. A certified volume enters the system; an equivalent certified volume is sold out of it, tracked and audited under scheme rules. The molecules in your tank may or may not be the certified ones. The accounting guarantees that the certified volume you bought was genuinely produced and was not sold to anybody else.
This is the same principle applied to certified sustainable palm oil, recycled polymer content and renewable electricity. It is a well-established model, but it is one that some reporting frameworks and some stakeholders treat with more scepticism than physical segregation.
Confirm that the framework you report under accepts mass-balance claims for this purpose. Discovering after the fact that your certified volume does not qualify for the claim you bought it to make is an expensive and entirely avoidable outcome.
What a credible claim contains
| Component | What to ask for | Why |
|---|---|---|
| Scheme | Named scheme, e.g. ISCC PLUS | Establishes the audited ruleset behind the claim |
| Certificate reference | The certificate number and validity dates | Lets you verify independently rather than take it on trust |
| Chain of custody model | Physical segregation or mass balance | Determines whether your framework accepts it |
| Feedstock | What the biogenic material actually is | Waste and residue feedstocks are treated more favourably than crops |
| GHG figure | The stated reduction percentage | The number you would report |
| System boundary | What the calculation includes | Without it the percentage is not auditable |
| Sustainability declaration | Per-consignment documentation | The transaction-level evidence trail |
In practice
- Establish your requirement first. Ask your auditor or reporting lead what they need before you go to market, not after you have a quote.
- Put certification in the enquiry. If you do not ask explicitly, you will be quoted conventional product — see buying methanol in the UK.
- Verify the certificate independently. Schemes maintain public registers. Checking takes minutes and is the whole point of the scheme existing.
- Get the documentation flow into the contract. Sustainability declarations per consignment, not a single certificate at the start of a supply period.
- Diarise expiry. Certificates have validity periods. A lapsed certificate mid-contract breaks the chain for everything after it.
It has no fixed technical meaning. It is a useful conversational shorthand and worthless as a specification. If an offer describes material only as green methanol, that is the first question to ask, not a detail to sort out later.
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