Izmir Odemis Biogas Power Plant

Audit Analysis

The Izmir Odemis Biogas Power Plant is a Gold Standard biogas cogeneration project with VVB-confirmed additionality and no reported reversals, but it is undermined by a project-specific modeled baseline, a 0% leakage deduction with contradictory justifications across documents, and a three-fold discrepancy in claimed emission reductions between the monitoring and verification reports. Ten material findings—including unit-conversion errors that initially overestimated ER, a baseline CO₂ exclusion, and a mismatch in engine count—raise meaningful concerns about data reliability and over-crediting risk.

Project Description

Red Flags

• ⚠Claimed ER differs by a factor of three between the monitoring report (222,749 tCO₂e) and the verification report (668,247 tCO₂e), while the verified figure is 536,703 tCO₂e—no single consistent baseline for the claim can be established.
• ⚠Unit-conversion mistakes in the registered PDD initially overestimated ER; the error was only corrected in the monitoring report, meaning earlier registry entries may reflect inflated credits.
• ⚠Leakage deduction is 0% yet the justification is contradictory: the verification report describes it as 'quantified' while the monitoring report calls it 'deemed negligible,' and a material finding required the project to demonstrate zero physical leakage via calculation.
• ⚠Baseline CO₂ emissions from electricity use were initially excluded from the final baseline value, meaning the baseline was understated and ER overstated until corrected.
• ⚠Discrepancy in the number and capacity of biogas engines (4 vs 5) between documents, and mismatched meter serial numbers between the monitoring report and on-site observations, undermine confidence in the monitoring data.

Credit Vintages