The used cooking oil (UCO) market faces distinct integrity challenges: distributed feedstock collection, variable quality and strong price signals that can incentivise misdeclaration. Our brief covered two organisations at different points in the value chain: an established ISCC EUcertified trader focused on UCO, and a collector/producer operating coprocessing. The objective in both cases was the same – credible evidence, clear ownership and data that stands up to external audit without unnecessary bureaucracy.
For the trader, certification had been maintained over several cycles, but expansion into new sourcing regions and higher counterpart volumes increased complexity. We started with a targeted gap analysis against current ISCC EU expectations, concentrating on controls that matter most in UCO chains: evidencing waste origin and collection; managing aggregation so traceability is preserved; tightening acceptance specifications; and clarifying sampling, archiving and retention rules for supplier documentation.
We then redesigned managementsystem artefacts to establish unambiguous role ownership from intake to sales and linked massbalance entries directly to underlying evidence so auditors can follow transactions from sale back to intake batches quickly. Scenariobased training embedded the changes in daytoday work—how to review supplier packs, handle exceptions and document decisions—and a focused internal audit plus management review sequence demonstrated an effective Plan–Do–Check–Act cycle to the certification body. The result is a cleaner audit trail, fewer surprises during audits and faster, more consistent onboarding of suppliers and customers.
For the collector/producer, we designed and implemented a complete compliance system aligned to ISCC EU/PLUS, with policies, procedures and work instructions that reflect real operations. The data model covers feedstock acquisition, aggregation, coprocessing and processing, supports tamperevident traceability and reconciliations, and makes evidence retrieval predictable. Because the site operates coprocessing (renewable and fossil streams in shared units), we added specific controls for:
Clear, auditable rules for allocating inputs/outputs (energy or mass basis, as applicable under ISCC) with supporting calculators and worked examples.
Defined plans for feedstock qualification and intermediate/final product checks, with retention and chainofcustody for samples.
Batch identifiers tied to equipment, timestamps and shift logs so auditors can trace a product lot to specific coprocessing periods.
From kickoff to certificate issuance, the programme completed in approximately three months, providing a replicable blueprint the organisation can scale across sites as volumes grow.
Across both engagements, the emphasis was on evidence auditors actually test and on the decisions that determine compliance in UCO supply chains. Where local documentation practices vary by region, we added lightweight localisation guidance while retaining a single core system.
The outcome is stronger, auditready operations at two critical points in the UCO value chain. The trader now operates with clearer responsibilities, faster reconciliations and a traceability story an auditor can follow endtoend. The collector/producer holds a practical, scalable system with trained teams and predictable evidence flows. Together, these improvements protect certificate validity, reduce friction in counterpart onboarding and give customers greater confidence in UCO as a credible decarbonisation feedstock.
