Petrobras Leverages Cardano to Resolve Carbon Double-Counting in Sustainable Fuels

Petrobras, Brazil’s state-controlled energy giant, is piloting Cardano to monitor sustainable aviation fuel (SAF) benefits and eliminate double-counting risks.

On September 30, the Cardano Foundation announced that an ongoing research and development partnership has produced applications for sustainable aviation fuel (SAF) and Diesel R, Petrobras’ renewable fuel brand.

The SAF initiative tackles the issue where the purchaser of a fuel’s environmental benefit differs from the actual user. The Book-and-Claim model allows an airline, corporation, or traveler to claim that benefit even if the SAF is produced or consumed elsewhere.

Petrobras built the SAF platform in collaboration with PUC-Rio University’s Ledger Labs and the Cardano Foundation. As per the Foundation’s case study, it represents SAF environmental attributes as standardized CS-SAF tokens on Cardano.

These tokens can be created, transferred, verified, and retired. Retirement ensures the same attribute cannot be claimed twice, while the digital ledger traces the allocation back to the original fuel certificate.

The underlying concept mirrors double spending in cryptocurrency—preventing the reuse of a digital asset—applied here to an environmental claim.

Travelers can input departure and destination airports, calculate a CS-SAF allocation, and receive a certificate detailing their route, distance, and allocation, according to the Foundation. This claim remains tied to the original SAF certificate.

The tokens carry metadata aligned with CORSIA, the Carbon Offsetting and Reduction Scheme for International Aviation.

According to guidance published on June 16 by the Roundtable on Sustainable Biomaterials, Book-and-Claim does not alter the physical fuel a buyer uses or its associated emissions. Airlines must disclose supported reductions separately from operational emissions.

Different value-chain participants can make distinct claims, provided their disclosures do not misrepresent the overall reduction.

Cardano Applications Beyond Aviation

The Diesel R project, developed with PUC-Rio, proposes checkpoints across production, transportation, and use. Its goal is a continuous fuel-lifecycle record that could support Scope 3 reporting, covering indirect emissions across a company’s broader value chain.

This would connect information held by suppliers and logistics providers, giving emissions reporting a more traceable supply-chain history. The Foundation describes this architecture as a proposed model within the R&D work.

The SAF platform illustrates how Cardano can record the allocation and retirement of environmental benefits. Commercial usage remains unquantified, as the Foundation’s disclosures provide no transaction volumes or revenue figures.

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