akar.earthBuffer pool: Definition
What is a buffer pool in carbon markets? How withheld credits insure against reversals, how contributions are set, and what it means for Indonesian projects.
A buffer pool is a reserve of non-tradable carbon credits that a programme holds back from projects to insure against reversals. Each project deposits a percentage of its verified credits into the pool, and the programme cancels buffer credits to cover losses from fire, storms or other reversal events.
Why it matters
Forest carbon can be lost after credits are sold. The buffer pool means buyers’ credits stay valid even when a project burns: the programme cancels buffer credits instead. For developers, the buffer contribution directly reduces saleable volume, so a lower risk score means more revenue.
How it works
- The project assesses its non-permanence risk, for example with Verra’s AFOLU non-permanence risk tool, scoring internal, external and natural risks.
- The score sets the percentage of credits deposited in the buffer at each verification.
- If a reversal occurs, buffer credits equal to the loss are cancelled.
- Some programmes release part of the buffer if risk falls over time; others keep it pooled permanently.
Verra runs a pooled AFOLU buffer shared across all projects. Gold Standard, Plan Vivo and ART TREES use their own buffer or risk-reserve designs. See our page on the Verra buffer pool.
Indonesia angle
Indonesian projects tend to score higher on natural risk (fire, especially on peat) and on external risks such as land tenure conflict and policy change. A strong fire-management record, clear tenure through PBPH, social forestry or customary forest recognition, and community benefit sharing can lower the score. The new domestic rules under Perpres 110/2025 and Permenhut 6/2026 also affect how political risk is assessed, so check the current regulations when scoring.
Common mistakes
- Treating the buffer as a fixed deduction rather than one that changes with each risk reassessment.
- Underestimating the buffer in financial models.
- Assuming the buffer covers avoidable reversals; proponents usually must compensate those themselves.
Related terms
See permanence, reversal and non-permanence risk, or browse the carbon standards hub.
Frequently asked questions
Are buffer credits returned to the project?
In Verra's pooled system, buffer credits are not returned. They stay in the shared pool to cover reversals across all projects. Rules differ by programme, so check the current version.
How big is a typical buffer contribution?
It depends on the project's risk score. Low-risk projects contribute less, high-risk ones more. Verra sets a minimum contribution, and projects scoring above a maximum risk level cannot be registered.