CYY Biopower Wastewater treatment plant including biogas reuse for thermal oil replacement and electricity generation Project, Thailand

Audit Analysis

A Thai biogas/wastewater treatment project (VCS-2261) with VVB-confirmed additionality and a recent monitoring period, but undermined by an extensive list of material findings (30+), a significant baseline overestimation (COD inlet 57% lower than ex-ante), GWP compliance errors, and numerous calibration and data-quality issues. The verified emissions reductions (49,663 tCO₂e) represent only about 41% of the pro-rata expectation for the elapsed monitoring period, suggesting the baseline was overly optimistic. Documentation quality is further weakened by low extraction confidence and a large number of corrective actions.

Project Description

Red Flags

• ⚠Lower COD inlet value observed than ex-ante estimated, leading to a -57.04% difference in emission reductions (verification report, 2026)
• ⚠Monitoring Report incorrectly sourced GWP values for CH4 and N2O from IPCC AR6 instead of required IPCC AR5 per VCS Standard v4.7 (verification report, 2026)
• ⚠FPIC status contradicted: verification report (2026) states FPIC was conducted, while the monitoring report (2026) states it was not
• ⚠Ex-ante lifetime ERR contradicted: verification report (2026) reports 517,230 tCO₂e while the monitoring report (2023) reports 775,845 tCO₂e
• ⚠No buffer pool percentage stated in available documents, and no explicit permanence risk mitigation beyond the 'not applicable' reversal statement

Credit Vintages