The CBAM definitive period runs from 2026, with free allocation phased to zero by 2034 and the first batch limited to steel, aluminium, cement, fertiliser, electricity and hydrogen. Petchem is not in that first batch, but do not read that as "no action needed."

One clause sets a PCF (product carbon footprint) pre-condition: any chain bound for the EU must evidence carbon data batch by batch, not a year-end total. With Brent at $111.63 today, the embedded energy-carbon cost rises, and European buyers will in turn demand proof of each batch's carbon intensity.

The implementation path is clear: cross-chain receipt mutual recognition pins title and flow on-chain, and SHA-256 fingerprints each batch's carbon data so both regulators and buyers can recompute independently. Whoever builds this first earns an extra tick on EU purchasers' qualified-supplier lists.

For SNSUC this is less a compliance cost than a moat: seven-grade crude transshipment that carries a verifiable carbon label can command pricing room in European refiners' term contracts.