Decarbonisation Technology May 2025 Issue

chains, and carbon reduction strategies. This gives certified companies a competitive advantage in a rapidly evolving industry. Concurrently, certification promotes systematic change through the resulting ripple effect to not only foster, but strengthen a global culture of sustainability in the industry. ISCC credit transfer system for SAF certification verifies SAF’s environmental credentials along the supply chain, but it typically concludes at airport delivery or earlier, Traditionally, sustainability

Scope 1 Voluntary climate disclosure

Scope 3 Voluntary climate disclosure

ISCC Registry

Scope 1 claim

Aircraft operator account

End customer account

SAF Supplier account

Scope 3 claim

Sustainability Declaration (SD) for SAF submitted to ISCC Registry

ISCC Mass balance certication (e.g. ISCC CORSIA, ISCC EU, ISCC PLUS)

ISCC

Control point (airport jet fueling system )

Feedstock producer

SAF Producer/ blend point

SAF supplier

Figure 5 Sample transaction flow within the ISCC Credit Transfer System, complementing traditional supply chain certification

and Scope 3 credits – between SAF suppliers, airlines, logistics providers, and end users. This system ensures that credits are generated, transferred, and retired transparently, preventing double counting and reducing the risk of misleading sustainability claims. Through the ISCC CTS, traceability goes beyond supply chain certification as often occurs under mandates, and enables tracking SAF claims after delivery, ensuring that emission reductions are accurately reported. Transparency is achieved through the ISCC Registry, a secure, open-access database where SAF credits are tracked and managed. Furthermore, the ISCC CTS ensures participants adhere to criteria to validate that claims made represent additional emissions reductions that go beyond what may be considered under regulatory mandates. To qualify for registration of SAF volumes within the system, SAF suppliers must hold valid certification under either ISCC PLUS or a recognised certification under ICAO CORSIA or EU RED. Furthermore, suppliers need to undergo the ISCC CTS audit procedures to

leaving limited mechanisms to track SAF claims following uplift. As airlines, logistics providers, and corporate end-customers increasingly seek to report emissions reductions from their SAF purchases credibly, ISCC responded by launching the ISCC CTS in April 2024. SAF credits provide a mechanism to ensure that emission reductions are achieved and correctly accounted for. They serve as evidence of the environmental benefits of SAF and allow organisations to use SAF credits for voluntary emissions reductions for corporate sustainability reporting, increasing the credibility of companies’ decarbonisation efforts. In addition, the credits facilitate the financial transactions needed to incentivise the production and subsequent uptake of sustainable fuels, enabling a market-based approach to emissions reduction. A digital solution for traceable and verifiable SAF claims The ISCC CTS is a digital registry-based system that facilitates the secure transfer of SAF sustainability claims – in the form of Scope 1