Interconnector capacity is increasingly treated as a compliance factor for electricity traders applying actual-emissions treatment under the EU Carbon Border Adjustment Mechanism (CBAM). Alongside enabling cross-market electricity transactions, transmission rights and related scheduling records can be used to link imported volumes to generation from a specifically identified eligible installation.
Owning cross-border capacity alone does not establish eligibility for actual-emissions treatment. Traders are required to keep an auditable connection between electricity generation, allocated capacity, and the volumes nominated for import into the EU.
Annex IV requirements for cross-border deliveries
Annex IV(5) includes a requirement for connection to the EU transmission system or evidence that physical network congestion did not occur along the relevant route at the time of export. Firm nominations must also be made against allocated interconnection capacity by the 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 may be secured through daily, monthly or longer-term auctions.
Traders need to document the capacity holder, delivery period, relevant nominations, accepted amendments and final schedules. Where capacity rights are resold or transferred, the documentation must reflect the actual transaction and comply with applicable capacity-allocation rules.
Linking generation data to accepted schedules
The independent power producer’s generation records should be linked to accepted schedules using consistent timestamps and quantity units. This linkage is part of maintaining the evidentiary trail required for actual-emissions treatment.
The documentation chain depends on matching plant-level output with the electricity schedule used for import. Missing or inconsistent confirmations can affect whether records support the emissions treatment claimed by an importer.
Serbia–Hungary: multiple parties and nomination confirmations
The Serbia–Hungary border illustrates how many entities may contribute to the evidence chain. A Serbian electricity producer, a local balancing party, an EMS-related scheduling process, an EU import trader and the interface with MAVIR may all be involved even though they operate as separate entities.
Contracts need to assign responsibility for collecting confirmations from each relevant system. They must also specify how rejected, amended or otherwise changed nominations are handled.
A generation forecast provided to a trader is not treated as equivalent evidence to a final nomination accepted by the relevant TSO. The records must show how actual plant generation relates to the schedule used for import.
Montenegro–Italy: CGES–Terna interconnector 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 presence of a physical interconnector does not mean that 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 are expected to retain allocation and scheduling records and assess them against conditions applicable to each specific delivery.
Portfolio aggregation and installation-level attribution
Portfolio aggregation adds a documentation challenge when trading desks offset purchases from multiple generating installations against a single physical import position. Even when netting improves commercial efficiency, attribution requirements remain tied to each installation.
The importer must still demonstrate which portion of the final imported volume is attributable to each installation for which actual-emissions treatment is claimed. Portfolio-level reconciliation cannot replace installation-specific attribution required under applicable rules.
Information systems should prevent assigning the same nominated megawatt-hour to multiple claims. They should also distinguish between cancelled, amended and superseded schedules so that compliance records reflect the final accepted position rather than an earlier version.
Status of proposed EU changes on physical-network constraints
An EU legislative proposal would remove or revise some current physical-network constraints. 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 current standards 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 are expected to work from shared records covering commercial positions, allocations, nominations and generation volumes. A missing nomination confirmation can create carbon-cost exposure that exceeds original auction fees or congestion rents.