How the ISO 14064 series works — Part 1 (organisation inventories), Part 2 (projects) and Part 3 (verification) — and why it underpins credible, CBAM-ready emissions data.
Introduction
When a number has to be believed — by a regulator, a lender, a CBAM customer or an auditor — it needs more than a spreadsheet behind it. For greenhouse gas emissions, the standard that provides that credibility is the ISO 14064 series. It is the international specification for quantifying and verifying GHG emissions, and it sits at the operational heart of credible carbon reporting. This article explains its three parts and why they matter.
The three parts of ISO 14064
ISO 14064 is split into three complementary parts:
| Part | Scope | What it does |
|---|---|---|
| ISO 14064-1 | Organisation | Specifies how to quantify and report a GHG inventory — Scopes 1, 2 and 3 — with boundaries, sources and methodology |
| ISO 14064-2 | Project | Quantifies emission reductions or removals from a specific project or activity |
| ISO 14064-3 | Verification | Specifies how to validate and verify GHG statements — the basis for independent assurance |
Most corporate work centres on Part 1 (the inventory) and Part 3 (its verification).
ISO 14064 and the GHG Protocol
A common question: does ISO 14064 replace the GHG Protocol? No — they work together. The GHG Protocol provides the detailed accounting and reporting guidance most organisations use to build an inventory; ISO 14064 provides the standardised, certifiable specification that an independent verifier can assess against. Build to the Protocol, verify against ISO 14064 — that is the usual, complementary pattern.
Why it matters now: CBAM and mandatory reporting
ISO 14064 has moved from good practice to commercial necessity in the GCC, for two reasons. First, CBAM: EU importers need verified embedded emissions, and the alternative — punitive default values — is expensive. An inventory quantified to ISO 14064-1 and verified to ISO 14064-3 is exactly what lets a GCC exporter avoid those defaults. Second, mandatory emissions reporting under national climate laws and exchange disclosure rules increasingly expects assurance-grade data. In both cases, ISO 14064 is the bridge from “we think our emissions are X” to “our emissions are X, and here is the verification.”
For a Gulf aluminium exporter, an ISO 14064-verified emissions figure isn’t a sustainability nicety. It’s the number that decides the CBAM bill.
How ESGweise helps
ESGweise builds GHG inventories to ISO 14064-1 and the GHG Protocol, and prepares them for independent verification under ISO 14064-3 — measured, boundaried, reproducible, and structured so the verifier (and your CBAM customers) can rely on them. We connect that data to your sustainability reporting and decarbonisation strategy. See our reporting and ISO Implementation practices.
Conclusion
ISO 14064 is the standard that makes emissions data believable. Its three parts — organisation inventories, projects, and verification — turn a self-declared figure into independently trusted evidence. With CBAM and mandatory reporting raising the stakes, ISO 14064-verified emissions are no longer optional for GCC industrial exporters; they are the number everything else depends on.
Frequently asked questions
What are the three parts of ISO 14064?
ISO 14064-1 specifies how to quantify and report an organisation's GHG inventory (Scopes 1, 2 and 3). ISO 14064-2 covers GHG projects — quantifying emission reductions or removals from a specific activity. ISO 14064-3 specifies how to validate and verify GHG statements, providing the basis for independent assurance.
How does ISO 14064 relate to the GHG Protocol?
They are complementary. The GHG Protocol provides detailed accounting and reporting guidance and is the most widely used framework for corporate inventories, while ISO 14064 provides the standardised, certifiable specification. Many organisations build their inventory to the GHG Protocol and have it verified against ISO 14064.
Why is ISO 14064 important for CBAM?
CBAM requires verified embedded emissions, and default values are deliberately punitive. An emissions inventory quantified to ISO 14064-1 and verified to ISO 14064-3 gives EU customers a credible, independent figure to use instead of the defaults — directly reducing a GCC exporter's CBAM cost.
What is the difference between validation and verification under ISO 14064-3?
Validation is a forward-looking check of a GHG project's planned reductions before they occur; verification is a backward-looking check of GHG statements (such as an inventory) for a past period. Both are independent assessments against agreed criteria, and both follow ISO 14064-3.