Three years after the Article 6 Rulebook was finalised at CMA.3 in Glasgow and refined through CMA.4 (Sharm el-Sheikh) and CMA.5 (Dubai), the centre of gravity has shifted decisively from negotiation to implementation. In July 2025, Ghana authorised and transferred 11,733 tCO₂e of Internationally Transferred Mitigation Outcomes (ITMOs) to Switzerland under a cookstoves activity — the first ever ITMO issuance from an African host and only the second completed authorised transfer globally [1][2]. The question facing the next wave of host countries is no longer whether to engage with Article 6.2, but how to build the institutional stack that makes authorised transfers repeatable, auditable, and bankable.
The implementation stack
A functioning Article 6.2 system is not a single platform. It is a layered stack with four distinct architectural concerns, each of which must be specified before the first Letter of Authorisation (LoA) is signed:
(1) National Designated Authority (DNA) workflow. A managed pipeline that moves an activity from concept note → eligibility screening → ministerial review → authorisation. The Decision 2/CMA.3 annex requires that authorisation statements explicitly cover the activity, the participating entities, the vintage period, and the intended use (NDC, OMGE, or 'other international mitigation purposes' such as CORSIA) [3].
(2) National registry. A system of record for issuance, holding, transfer, cancellation, and retirement of ITMOs, with a defensible serial-number scheme that survives audit. Several jurisdictions have adopted the UNFCCC International Registry as a baseline; others have implemented sovereign registries, including Ghana's Carbon Markets Office registry built around its Carbon Market Framework [2].
(3) Corresponding-adjustment (CA) engine. The accounting layer that subtracts every authorised ITMO from the host's NDC inventory in the Initial Report and tracks the cumulative balance across the NDC implementation period. Decision 2/CMA.3 prescribes annual information and biennial information reporting; the corresponding adjustment must be applied in the year of the underlying emission reduction, not the year of transfer.
(4) ETF/BTR reporting pipeline. The Enhanced Transparency Framework (Article 13) Biennial Transparency Report (BTR) is the binding external deadline. The first BTRs were due 31 December 2024, and the Article 6 information requirements (Initial Report, Annual Information, Regular Information) must reconcile to the same inventory used in the BTR. In practice, the BTR cycle — not the project cycle — is the constraint that reorders implementation priorities.
Architectural lessons from the early movers
Across the Ghana–Switzerland, Thailand–Switzerland, Sweden–Ghana, and emerging Vanuatu, Senegal, and Dominican Republic frameworks, three architectural lessons are consistent:
First, separate the registry of credits from the registry of authorisations. Conflating them produces audit failures within the first reporting cycle because an issued mitigation outcome is not the same object as an authorised ITMO — the latter carries an obligation that the former does not.
Second, make the corresponding adjustment a first-class data object. CAs are not metadata on a transfer record; they are accounting entries against a specific NDC target line, with their own audit trail. The UNDP–Ghana case study explicitly documents this as a foundation requirement for the cooperative approach [4].
Third, design back from the BTR submission window. Every system upstream — MRV, validation, registry, authorisation — must close in time for the BTR. Working back from the December BTR deadline typically forces MRV cut-offs in Q1 and authorisation decisions in Q2 of the reporting year.
Where CAS fits in
CAS works with host-country DNAs and project proponents on the parts of the stack that determine whether an authorised transfer will survive an Article 6 Technical Expert Review. We focus on four concrete deliverables: (a) the DNA's authorisation procedure and templates aligned to Decision 2/CMA.3; (b) the registry data model and serial-number scheme, with CA tracking as a first-class concern; (c) MRV-to-registry data pipelines engineered for the BTR cadence rather than ad-hoc project reporting; and (d) project-level Initial Reports and Annual Information packs ready for validation. We are an independent technical consultancy — we do not validate or verify the projects we help structure.
Sources
[1] Ghana News Agency, 'Ghana issues first ITMOs under Paris Agreement', 9 July 2025.
[2] Ghana EPA Carbon Markets Office, 'Ghana–Swiss Cooperative Approach under Article 6.2'.
[3] UNFCCC, Decision 2/CMA.3, 'Guidance on cooperative approaches referred to in Article 6, paragraph 2, of the Paris Agreement'.
[4] UNDP, 'Advancing the Paris Agreement Through Cooperative Approaches: The Ghana–Switzerland Case Study'.