Interconnector capacity is becoming a compliance consideration for electricity traders applying actual-emissions treatment under the EU Carbon Border Adjustment Mechanism (CBAM). Alongside enabling commercial electricity transactions between markets, transmission rights and scheduling records can support whether imported volumes correspond to generation from a specifically identified eligible installation.
Owning cross-border capacity does not, on its own, establish eligibility for actual-emissions treatment. Traders are required to maintain an auditable link between the electricity produced, the capacity allocated, and the volumes nominated for import into the EU.
Annex IV requirements for cross-border deliveries
Annex IV(5) includes a connection to the EU transmission system or evidence that physical network congestion did not occur along the relevant route at the time of export. The framework also requires firm nominations against allocated interconnection capacity by responsible transmission system operators (TSOs) in the country of origin, destination and any transit countries.
The nominations must match the installation’s generation over intervals of no longer than one hour. The requirements apply cumulatively, so purchasing a cross-border capacity right cannot replace other evidence needed to support an actual-emissions claim.
Record preparation starts before electricity is delivered. Depending on the border and applicable market rules, transmission capacity can be obtained through daily, monthly or longer-term auctions.
Traders need to identify the capacity holder, delivery period, relevant nominations, accepted amendments and final schedules. The independent power producer’s generation records should then be linked to accepted schedules using consistent timestamps and quantity units.
Linking generation records to accepted schedules
Where capacity rights are resold or transferred, documentation must reflect the actual transaction. It must also comply with applicable capacity-allocation rules.
This documentation approach depends on keeping records aligned with accepted schedules rather than earlier steps. The requirement that nominations correspond to generation over hourly intervals is part of the evidence chain used for actual-emissions treatment.
Serbia–Hungary scheduling confirmations across multiple parties
The Serbia–Hungary border illustrates how many parties may contribute to evidence under CBAM-related electricity documentation. The chain can include a Serbian electricity producer, a local balancing party, an EMS-related scheduling process, an EU import trader and an interface with MAVIR.
Contracts need to set out responsibility for collecting confirmations from each relevant system. They also need to specify how rejected, amended or otherwise changed nominations will be handled.
A generation forecast provided to a trader does not constitute the same evidence as a final nomination accepted by the relevant TSO. Records must demonstrate the relationship between actual plant generation and the electricity schedule used for import.
Missing or inconsistent confirmations can undermine documentation supporting claimed emissions treatment. The allocation of responsibilities is therefore tied directly to maintaining that relationship in the compliance record.
Montenegro–Italy interconnector access and congestion conditions
The Montenegro–Italy corridor involves different network conditions because electricity can be transmitted through the undersea CGES–Terna interconnection. Traders need to establish how market zones, allocated transmission rights and nomination requirements interact with dispatch at the generating installation in Montenegro.
The interconnector provides an export route, but its existence does not mean every element of the route between the generating plant and the EU border satisfies CBAM requirements. Cable availability and whether congestion occurs across the relevant network route are separate considerations.
As a result, evidence of interconnector access alone may not establish compliance. Traders must retain relevant allocation and scheduling records and assess them against conditions applicable to each specific electricity delivery.
Portfolio aggregation and installation-level attribution
Portfolio aggregation creates another documentation challenge for traders. Trading desks may offset purchases from several generating installations against a single physical import position to improve netting efficiency.
The importer still needs to demonstrate which portion of final imported volume is attributable to each installation for which actual-emissions treatment is claimed. Portfolio-level reconciliation cannot replace installation-specific attribution required by applicable rules.
Information systems should prevent the same nominated megawatt-hour from being assigned to multiple claims. They should also distinguish between cancelled, amended and superseded schedules so that the compliance record reflects the final accepted position rather than an earlier version.
Status of proposed EU changes affecting physical-network constraints
An EU legislative proposal would remove or revise some current physical-network constraints related to evidence collection. As of October 2026, it remains a proposal rather than an enacted change allowing traders to stop collecting existing congestion and nomination evidence.
Until legal requirements change, maintaining records to the current standard remains necessary. Contracts can include provisions allowing administrative requirements to be adjusted if future legislation changes what evidence is needed to qualify imported electricity.
Transmission-capacity teams and CBAM compliance teams need shared records covering commercial positions, allocations, nominations and generation volumes. The economic assessment of an interconnector increasingly involves more than auction fees and congestion rents because missing nomination confirmation can create carbon-cost exposure exceeding the original capacity fee.