AVN08-S-01, Methane Recovery and Biogas Utilization Project, Nghe An Province, Vietna

Audit Analysis

A Gold Standard methane recovery and biogas cogeneration project in Vietnam with VVB-confirmed additionality and an avoidance-type design that limits permanence risk. However, the project carries a heavy burden of material findings and corrective actions across multiple verification cycles, including a grid emission factor mismatch that could overstate credits by roughly 10%, a methodology version error, and several calculation inconsistencies. The project-specific modeled baseline, absence of a stated buffer pool, and a 0% leakage deduction with initially weak justification further temper confidence in the integrity of the claimed reductions.

Project Description

Red Flags

• ⚠Grid emission factor in the 2023 monitoring report (0.823 tCO2/MWh) did not match the PDD-registered value (0.74405 tCO2/MWh), flagged as CAR#02; using the higher factor would overstate verified reductions by approximately 10%.
• ⚠The monitoring report applied methodology AMS-I.C version 21 instead of the registered version 22 (CAR#01), raising the risk that calculation rules differed from those approved at registration.
• ⚠Ten or more corrective actions (CAR#01–CAR#10) were raised across verification cycles, including inconsistent baseline and project estimates, a missing prior annual report, and an unmentioned deviation request, indicating recurring documentation and calculation quality issues.
• ⚠No buffer pool percentage is stated in any available document, and reversal events were described as 'not addressed' in the 2023 verification report before being reported as 'none' in the 2025 monitoring report.
• ⚠CORSIA eligibility is confirmed as true while CCP status is not stated, leaving the dual-channel allocation risk unresolved.

Credit Vintages