Chol Charoen Group Wastewater Treatment with Biogas System I (Cholburi)

Audit Analysis

A long-running Thai wastewater-to-biogas project with VVB-confirmed additionality and a reasonable pro-rata delivery rate (87% of expectation), but plagued by chronic MRV weaknesses including repeated calibration gaps, missing monitoring data, and dozens of corrective actions across multiple verification cycles. The project-specific modeled baseline, absence of FPIC, and low document extraction confidence further erode confidence in the credit quality.

Project Description

Red Flags

• ⚠Dozens of material findings and corrective actions across multiple verification periods (2009–2025), including recurring calibration gaps for COD analyzers, flow meters, and weighbridges, indicating systemic MRV weaknesses
• ⚠FPIC was not conducted and benefit sharing is not described in the most recent (2025) verification report, despite a grievance mechanism being in place
• ⚠Low extraction confidence across the document set, meaning at least one key document was poorly readable, reducing assurance in the extracted data
• ⚠Boiler 2 (outside project boundary) was used during Boiler 1 downtime, and Generator 5 replaced Generator 4 with reduced capacity — operational changes that complicate baseline and emission accounting

Credit Vintages