“Over the years we’ve invested significantly in our field data team - focusing on producing trusted ratings. While this ensures the accuracy of our Ratings, it doesn’t allow the scale across the thousands of projects that buyers are considering.”
For more information on carbon credit procurement trends, read our "Key Takeaways for 2025" article. We share five, data-backed tips to improve your procurement strategy.
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Background
Carbonyx is developing a next-generation biochar carbon removal project in New Zealand that addresses the accumulation of slash and harvest residues following commercial forestry operations.
When plantation forests are harvested, large volumes of woody biomass are left to decompose, releasing carbon back into the atmosphere, while also creating operational, environmental and community issues due to its impact on waterways and downstream infrastructure.
Carbonyx transforms this biomass into biochar through pyrolysis, an effective carbon removal method, while supporting improved forestry residue management across New Zealand's plantation sector.
The project operates under a 15-year crediting period commencing in April 2027. Carbonyx is designed for a disciplined, phased scale-up, with production capacity increasing over an initial three-year ramp-up period. At full operational capacity, the project expects to issue more than 18,000 credits annually, while maintaining consistent production controls, feedstock traceability and digital monitoring across the expanded operation.
A key differentiator is Carbonyx's commitment to digital Monitoring, Reporting and Verification (dMRV), through integration with the Cula platform. In a sector where buyer confidence often hinges on the credibility of monitoring infrastructure, Carbonyx has built that infrastructure in from the start.
The challenge
Biochar carbon removal is a credit type recognized for its integrity and durability that institutional buyers are paying close attention to. However, because it is still a relatively new and technically complex category, the bar for credible independent validation is high. Sophisticated buyers require clear, independent evidence before committing capital or entering long-term offtake arrangements.
The questions buyers and investors ask are detailed:
- How conservative are the carbon accounting assumptions?
- How is feedstock sourced and tracked?
- How durable is the biochar once applied?
- How does the project perform against global benchmarks?
Carbonyx needed a rigorous, independent Pre-Issuance assessment that could answer those questions, and give buyers and partners the evidence base to act with confidence.
"We designed Carbonyx to meet the standards expected by the world's most discerning carbon credit buyers. Independent assessment has helped confirm those strengths and gives the market a clear basis for confidence."
Carbonyx spokesperson
The solution
Sylvera's Pre-Issuance solution assessed the Carbonyx project across the same framework used for post-issuance Ratings, evaluating the project across four core pillars: Carbon Accounting, Additionality, Permanence, and Safeguarding & Co-benefits.
The assessment confirms that the project design is of high integrity, exhibiting very low risk across Carbon Accounting, Additionality and Permanence.
Carbon Accounting
The project achieved a very low-risk assessment for carbon accounting boundaries and emissions monitoring. Its cradle-to-grave system boundary is conservative and comprehensive, with emissions allocated fully to biochar. Cula's digital MRV infrastructure supports robust, end-to-end monitoring and traceability. Sylvera's independently-recreated life cycle assessment also provided insights for Carbonyx to align future quantification even more closely with best practice assumptions as the project moves toward issuance.
Additionality
Additionality has been assessed as very low risk, the strongest possible outcome. There are no regulatory mandates or public funding pathways for biochar production in New Zealand, and the project is demonstrably reliant on carbon revenue to be viable.
Permanence
Permanence was assessed as very low risk, reflecting the biochar’s expected durability and suitability for long-term soil carbon storage. As production scales, Carbonyx will continue testing biochar characteristics to demonstrate consistency across commercial output. Cula’s dMRV platform will provide end-to-end traceability from production through to soil application, supporting transparent monitoring and continued confidence in permanence outcomes at increasing production volumes.
Safeguarding and co-benefits
Safeguarding was assessed as low risk, with robust worker health and safety protocols and strong environmental management in place. Moderate positive impacts to SDGs 8, 9 and 12 have been identified within the co-benefits assessment, underpinned by regional employment creation, improved land stewardship, and productive use of forestry residues driven by project activities.
Continuous Improvement and Value
The Continuous Improvement Module identified specific opportunities to further strengthen the project's carbon accounting. These included refinements to LCA boundaries, leakage assessment methodology, permanence factor calibration, and end-use verification, providing a clear roadmap to further improve the project.
The Value Module assessed Carbonyx's pathway to regulated and compliance markets, revenue model diversification opportunities, and regulatory incentive alignment, including New Zealand ETS eligibility considerations and CORSIA pathway analysis. It also provided Sylvera's spot market outlook and pricing benchmarks for high-integrity biochar credits, giving Carbonyx a market intelligence foundation for offtake pricing discussions.
"The assessment did more than confirm quality. It gave us focused actions to strengthen an already high-integrity project and market intelligence that directly supports our commercial strategy."
Carbonyx spokesperson
The results
The Pre-Issuance AA Rating gives Carbonyx an independently assessed quality signal ahead of issuance, helping commercial conversations move from explaining credibility to discussing alignment, volume, timing and partnership structure.
Independent biochar validation. For buyers evaluating biochar CDR for the first time, Sylvera's assessment provides the rigorous, evidence-based analysis required to distinguish high-quality projects. An AA Pre-Issuance Rating is a meaningful signal through complex technical due diligence.
dMRV as a commercial differentiator. The assessment confirmed how the Cula platform integration provides the institutional-grade transparency that serious buyers and compliance frameworks increasingly require.
Integrity through scale.
Carbonyx’s phased expansion model is designed to maintain consistent carbon accounting, production monitoring and traceability as output increases. The combination of ongoing biochar testing and Cula’s dMRV infrastructure provides buyers with increased confidence that project integrity can be maintained throughout commercial scale-up.
A roadmap for continuous improvement. Acting on Sylvera's recommendations, Carbonyx strengthened its approach and moved from an initial A to a final Pre-Issuance Rating of AA. This demonstrates a commitment to quality improvement that is the kind of iterative, evidence-based approach that buyers and investors increasingly look for in long-term partners.
A Pre-Issuance AA Rating from Sylvera changes the nature of the conversations we are having. It lets us get to the commercial discussion faster, with a level of confidence on both sides in a way that was not possible before.
Carbonyx spokesperson
Key outcome
Carbonyx enters its next phase with independent recognition of its carbon accounting, additionality, permanence, and environmental and community safeguards. The AA Pre-Issuance Rating is both validation of the work completed and a strong platform for disciplined delivery, first issuance and commercial scale-up.
About Carbonyx
Carbonyx Limited is developing a next-generation biochar carbon removal platform in New Zealand, converting plantation forestry residues into durable, high-integrity carbon removals. Built on advanced pyrolysis technology, rigorous carbon science, and institutional-grade digital MRV through the Cula platform, Carbonyx is creating a replicable model for scalable CDR that simultaneously addresses forestry slash management and supports New Zealand's transition to a low-carbon future.
