Chol Charoen Group Wastewater Treatment with Biogas System I (Chacherngsao)
#3of 111 in Biogas#2of 22 in Thailand#85of 629 in Verra (VCS)#1of 22 in AMS-III.H
Audit Analysis
A long-running Thai biogas project (operating since 2009) with VVB-confirmed additionality and no reversal events, but weakened by an unaddressed leakage justification in the latest verification report, a project-specific baseline, and multiple calibration gaps that required conservative error adjustments. The claimed and verified emission reductions match exactly for the current monitoring period, and the project is not CORSIA-eligible, limiting dual-channel risk.
Red Flags
- Leakage deduction of 0% with no justification in the 2024 verification report (the 2017 report had stated 'deemed negligible', but the more recent report does not address leakage at all)
- Buffer pool percentage not stated in any available document, leaving permanence risk unquantified
- 17 Corrective Action Requests raised during verification, including calibration gaps across seven instruments (spectrophotometer, methane analyzer, flowmeters, biogas meters, electricity meter, fuel oil meter)
- Deviation in methodology for baseline emission estimation under AMS-I.C was accepted by the VVB, introducing baseline uncertainty
Credit Vintages
| Issued | Retired | Available | ||
|---|---|---|---|---|
| 2009 | 5,229 | 5,229 | 0 | |
| 2010 | 15,612 | 15,612 | 0 | |
| 2011 | 21,066 | 21,066 | 0 | |
| 2012 | 21,000 | 21,000 | 0 | |
| 2013 | 16,890 | 16,890 | 0 | |
| 2014 | 10,516 | 10,516 | 0 | |
| 2015 | 31,693 | 31,693 | 0 | |
| 2016 | 45,736 | 45,736 | 0 | |
| 2017 | 37,120 | 37,120 | 0 | |
| 2018 | 16,670 | 16,670 | 0 | |
| 2019 | 56,968 | 56,968 | 0 | |
| 2020 | 29,678 | 29,678 | 0 | |
| 2021 | 22,440 | 16,298 | 6,142 | |
| 2022 | 3,159 | 100 | 3,059 | |
| Total | 333,777 | 324,576 | 9,201 |
Risk Indicators
VVB-confirmed investment test
No reversals but buffer pool unquantified
0% deduction, unaddressed in 2024 report
Project-specific, reassessed 2020
FPIC, grievance mechanism, benefit sharing confirmed (2024)
Not CORSIA-eligible; CCP status not stated
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