Anaerobic Biodigesters in the Yucatán Peninsula 1
#44of 111 in Biogas#10of 27 in Mexico#118of 213 in CDM (UNFCCC)#24of 62 in AMS-III.D
Audit Analysis
A CDM methane-avoidance project using anaerobic biodigesters in Mexico with VVB-confirmed additionality, but significant gaps in leakage treatment, permanence safeguards, and verified emission figures. Ten material findings (five critical) were raised at validation, and the project-specific modeled baseline adds uncertainty. The project is also dated (2009) with only one year of monitoring data available.
Red Flags
- Leakage is explicitly not addressed in a biogas/methane-avoidance project where displaced methane or sludge mismanagement could undermine claimed reductions
- Ten material findings (five critical, five major) were raised during validation, including missing WMS details, absent farm inventories for ex-ante calculations, and unclear solid-separator usage
- No buffer pool or permanence mechanism is documented despite the inherent reversal risk if biodigesters cease operating
- Verified ERR figure for the monitoring period is not found in the extracted record, preventing independent cross-check of claimed reductions
Credit Vintages
| Issued | Retired | Available | ||
|---|---|---|---|---|
| 2012 | 43,122 | 0 | 43,122 | |
| 2013 | 69,241 | 0 | 69,241 | |
| Total | 112,363 | 0 | 112,363 |
Risk Indicators
VVB-confirmed common-practice test
No buffer pool; reversal risk unaddressed
Not addressed in a methane-avoidance project
Project-specific, modeled; no reassessment data
Mentioned but FPIC and grievance mechanism not documented
CORSIA and CCP status not stated
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