Methane Recovery and Biogas Utilization Project, Yen Bai Province, Vietnam

Audit Analysis

This Gold Standard methane recovery and biogas cogeneration project in Vietnam has VVB-confirmed additionality and a measured baseline, but is undermined by a 0% leakage deduction with no justification, the absence of any buffer pool, eight material findings, and eleven outstanding corrective actions. Multiple internal contradictions in ERR figures, grid emission factors, and crediting periods across documents raise data-reliability concerns. The project delivered roughly 79% of the pro-rata ex-ante expectation for the monitored period, suggesting modest under-delivery rather than over-crediting.

Project Description

Red Flags

• ⚠0% leakage deduction with justification recorded as 'not addressed' in the 2025 verification report, despite the 2021 report having previously quantified leakage
• ⚠Eleven corrective actions remain open, including inconsistencies in ex-ante parameters (nCOD, EFFFb, DCH4, GWP) across the MR, PDD, and ER sheet
• ⚠Two different lifetime ex-ante ERR values (155,524 and 331,067) appear in the same PDD dated 2020-10-14, an unresolved internal contradiction
• ⚠Additionality test type differs between the 2020 PDD (combined) and the 2023 validation report (investment), creating ambiguity about the actual test applied

Credit Vintages