European importers face an operational challenge under the EU Carbon Border Adjustment Mechanism (CBAM): embedded emissions data used for customs-linked reporting often comes from multiple companies and several production steps away from the point of declaration.
Clarion.Engineer, an engineering and environmental consultancy, has developed a methodology intended to address that distance by shifting CBAM compliance toward a continuous factory-level process rather than an annual emissions calculation.
Methodology linking importers, declarants and non-EU supply chains
The framework connects EU importers and authorised CBAM declarants with non-EU manufacturers, exporters, precursor suppliers, energy providers and emissions-verification specialists. It describes the activities, responsibilities, controls and evidence expected from each party.
Those expectations extend from the purchase of raw materials through to the delivery of verified embedded-emissions data to the European customer. The approach is designed around how information is generated across the supply chain rather than only at the reporting stage.
CBAM definitive phase raises focus on emissions information quality
CBAM entered its definitive phase in January 2026. The change places greater emphasis on the quality of emissions information attached to imported goods.
For producers outside the EU, the implications extend beyond regulatory reporting. European buyers increasingly seek assurance that suppliers can produce consistent, traceable and verifiable data before agreeing volumes, prices or long-term contracts.
A Clarion spokesperson said the key challenge is not the final calculation but the chain of evidence beneath it, including production records, energy consumption, precursor emissions, allocation methods, meters and laboratory results. The spokesperson also pointed to the need to connect factory output with goods delivered to the EU.
MRV cycle for production boundaries, sources and electricity use
Clarion’s methodology uses an integrated Monitoring, Reporting and Verification (MRV) cycle. It starts with product classification and defining production boundaries before mapping emission sources, production routes, precursor inputs and electricity consumption.
The process then assigns data owners, reporting frequencies and control responsibilities across factory departments. Production, procurement, finance, environmental management, laboratories, energy teams and IT functions are expected to contribute to a single controlled reporting system.
The model also changes how operational data are handled during the year. Clarion says operational figures are periodically reconciled with procurement records, energy invoices, inventories, production accounts, sales documents and export quantities.
Reconciliation during reporting year and attention to precursor inputs
Under Clarion’s approach, anomalies are investigated during the reporting year rather than reconstructed after it ends. This is intended to support ongoing alignment between reported data and underlying records.
The framework gives particular attention to precursors—materials used to produce another CBAM good whose embedded emissions may be carried into a final product. Clarion notes that manufacturers using purchased steel, aluminium or fertiliser inputs may rely on data originating at separate installations in other countries under different reporting systems.
Clarion’s procedure requires factories to identify precursor suppliers and production locations, along with quantities, production routes and reporting periods. It also requires recording the verification status of received data.
Supplier data controls: questionnaires, defaults and change management
To distinguish reliable information from estimates or unsupported declarations, Clarion describes supplier questionnaires, supporting-document requirements, risk classifications and escalation procedures. Where supplier data are incomplete, it says factories must record limitations and determine whether actual information can be used or whether a default approach applies under relevant rules.
The methodology also introduces change controls covering new suppliers, altered production routes and changes in origin or specification of precursor materials. This is intended to manage how upstream changes affect embedded-emissions values for finished goods.
Separating commercial electricity claims from CBAM-relevant evidence
Clarion identifies electricity data as a separate risk area. It says industrial consumers may receive renewable-energy declarations, contractual certificates or environmental marketing claims from power suppliers without those documents automatically establishing an emissions value permitted under CBAM.
The framework therefore separates commercial energy claims from evidence relevant under applicable calculation rules. Consumption data must be reconciled with meters and invoices while generation-source information, emission factors and contractual arrangements are checked for eligibility and traceability.
Pre‑Verifier role versus accredited verifier independence
A central element of Clarion’s methodology is the role of a “Pre‑Verifier”, described as a readiness and internal-assurance specialist rather than a statutory verifier. A Pre‑Verifier engaged by a factory may review monitoring plans, test calculations and examine precursor information before formal verification begins.
Clarion says this role can assess controls and perform sample checks to identify deficiencies early. The aim is to reduce late-stage corrections while producing a structured evidence package for an accredited verifier.
The company distinguishes Pre‑Verification from formal verification outcomes. Clarion states that Pre‑Verification does not constitute a CBAM certificate or formal verification opinion; where embedded-emissions data must be verified under regulation, responsibility remains with an appropriately accredited verifier.
Alternative model using local specialists under EU-accredited direction
The methodology also covers a second operating model in which a local technical specialist performs defined work under direction from an EU-accredited verifier. Clarion says this can include site visits, process observation, interviews, technical testing and collecting evidence at non-EU installations.
In this arrangement, Clarion states that the accredited verifier retains control over verification strategy, risk assessment, materiality, sampling decisions, evaluation of findings, independent review and final conclusion. The framework requires a strict independence barrier between preparation work and independent verification for the same installation and reporting period.
Evidence package structure: responsibility matrices and digital data room
Clarion says its boundary between roles is supported through separate responsibility matrices, engagement models and reporting lines. It describes method-statement components including work-breakdown structures (RACI matrices), data registers, meter inventories and precursor logs.
The documentation set also includes risk-and-control matrices, corrective-action records and verifier request trackers. Clarion further proposes a structured digital “data room” for transferring approved evidence to the verifier and where appropriate to the EU customer.
Staged MRV development from gap assessment to routine operation
The methodology allows factories to build MRV systems in stages. Clarion says these begin with a scope-and-gap assessment followed by system design and data-control implementation.
The staged approach continues through pilot calculations into internal Pre‑Verification and corrective action. Final stages cover accredited-verifier readiness along with routine monthly and annual operation.
Importer expectations on timing, evidence access and default values
For importers, Clarion describes an attraction in increased visibility over carbon exposure before reporting deadlines. It says buyers may seek contractual rights to obtain data, question calculations and request supporting evidence while receiving early notification of changes affecting embedded emissions.
Buyers may also impose reporting timetables alongside verification requirements and remedies for incomplete or late information. Clarion states that suppliers unable to meet these expectations could face less favourable default values or delayed orders alongside pressure to renegotiate commercial terms.
No shift in legal responsibility for declarants or verifiers
Clarion says effectiveness depends on underlying factory records quality and upstream suppliers’ willingness to provide credible information. It adds that detailed procedures cannot compensate for missing meters or inconsistent production data or an uncooperative precursor supplier.
The methodology does not transfer legal responsibility away from the authorised CBAM declarant, factory operator or accredited verifier. Clarion argues its value lies in connecting those responsibilities before formal reporting and verification begins.
CBAM as market access issue for exporters outside the EU
For industrial exporters outside the EU region covered by CBAM obligations in practice at import stage, Clarion describes CBAM as increasingly linked to market access and customer confidence rather than only environmental compliance. It says businesses best placed to respond may treat emissions information with discipline comparable to production quality control alongside financial reporting and customs documentation.