Dissemination of fuel efficient biomass stoves and water purification systems in Tanzania

Audit Analysis

A Gold Standard biomass stove and water purification project in Tanzania with VVB-confirmed additionality, but undermined by a project-specific baseline, a 0% leakage deduction that is aggressive for a stove-displacement project, a 16% gap between assumed and verified usage rates, and an unusually high volume of material findings and corrective actions. Multiple contradictions across documents—particularly in leakage treatment, usage rates, and crediting period dates—raise questions about the consistency and reliability of the project's claims over time.

Project Description

Red Flags

• ⚠0% leakage deduction justified only as 'deemed negligible' for a stove-displacement project where users can revert to traditional cookstoves; the 2013 monitoring report described leakage as 'quantified', but the 2018 verification report reclassified it as 'deemed negligible'—a less rigorous treatment
• ⚠Usage rate assumed at 1.0 in the PDD but verified at only 0.84 in the 2018 verification report, meaning initial claims were approximately 19% overstated; the 2015 monitoring report showed an even lower verified rate of 0.6443
• ⚠24 material findings and 20 corrective actions identified by the VVB, including missing calculation details, inconsistent parameters, missing serial numbers, and unresolved ownership-rights issues for the water purification component
• ⚠No buffer pool or permanence mechanism identified in any available document, leaving the project exposed to reversal risk from stove breakage, replacement, or user abandonment
• ⚠Crediting period start date differs between the 2012 validation report (07-01-2010) and the 2018 verification report (07-01-2011), a six-month discrepancy that affects the baseline period and total claimable credits

Credit Vintages