Anaerobic Biodigesters in the Yucatán Peninsula 2

Audit Analysis

This CDM biogas project (AMS-III.D) has VVB-confirmed additionality via a combined test, but suffers from significant gaps: leakage is entirely unaddressed, no buffer pool is documented, the baseline is project-specific and modeled, and five material findings required corrective action. The absence of a verified ERR figure and the contradiction between two monitoring reports on total claimed reductions (18,525 vs 23,743 tCO₂e) undermine confidence in the credit quantity.

Project Description

Red Flags

• ⚠Leakage is explicitly not addressed in any available document, despite the project displacing energy use that could shift emissions to other sources
• ⚠Two monitoring reports give different total ERR claimed values (18,525 in the 2013 report vs 23,743 in the 2012 report) with no explanation for the discrepancy
• ⚠No buffer pool percentage is documented, leaving permanence risk unmitigated for a project whose credits depend on continued biodigester operation
• ⚠Five material findings (CARs) were raised at validation, including missing WMS site details, missing farm addresses, and missing baseline scenario sources
• ⚠No verified ERR figure is available in the extracted record, making it impossible to confirm actual delivery against the ex-ante estimate

Credit Vintages