Gansu Gaotai Biogas Recovery and Utilization Project

Audit Analysis

The Gansu Gaotai biogas project is a registered VCS project with VVB-confirmed additionality and appropriate safeguards, but it carries a heavy burden of nine material findings and ten corrective actions that raise serious concerns about methodological rigour and documentation quality. The 0% leakage deduction is supported by contradictory justifications across verification reports, and four inter-document contradictions (including a 10× discrepancy in the claimed ERR figure between the PDD and the verification report) undermine confidence in the data. The project delivered only about 56% of its pro-rata ex-ante expectation for the elapsed monitoring period, which is conservative but may signal an overestimated baseline.

Project Description

Red Flags

• ⚠Nine material findings and ten corrective actions identified in the verification report, including use of outdated 2006 IPCC Guidelines instead of the 2019 Refinement, missing farm identification in the monitoring boundary, and absence of a double-counting declaration.
• ⚠Leakage deduction of 0% is justified as 'quantified' in the 2023 verification report but was 'deemed negligible' in the 2021 verification report — the shift in justification without a change in the 0% value is internally inconsistent.
• ⚠The PDD lists a lifetime ex-ante estimate of 221,417 tCO₂e while the verification report reports 23,611 tCO₂e for a 16-month monitoring period; although these are on different bases, the 10× gap and the fact that the project delivered only ~56% of the pro-rata expectation warrant scrutiny of the baseline.
• ⚠Minimum extraction confidence is rated 'low', indicating at least one key document was poorly readable, which limits the reliability of the extracted record.

Credit Vintages