IBB Biomethanation Plant Project

Audit Analysis

The IBB Biomethanation Plant in Turkey is a Gold Standard biomass project with VVB-confirmed additionality, but it is undermined by extensive data contradictions across documents, a significant capacity shortfall (operating at ~18% of design), and a verified ER that covers only about 18% of the pro-rata ex-ante expectation for the elapsed monitoring period. The project is under-crediting rather than over-crediting, which mitigates greenwashing risk, but the unrealistic ex-ante estimates and numerous unresolved corrections raise questions about the robustness of the underlying methodology application.

Project Description

Red Flags

• ⚠Verified ER of 25,482 tCO2e covers only ~18% of the pro-rata ex-ante expectation (~140,535 tCO2e) for the 2.2-year monitoring period within the 5-year crediting period, indicating the ex-ante estimates were significantly over-optimistic
• ⚠Material finding CAR-02 documents a discrepancy between stated waste/biogas capacity (437.5 t / 12,000 m³) and actual operation (80 t / 4,800 m³), meaning the plant operates at roughly 18% of design capacity
• ⚠Three different grid emission factor values appear across documents (0.4458, 0.5403, 0.5706 tCO2/MWh), creating uncertainty in the ER calculation basis
• ⚠25+ corrective actions remain open in the verification report, including errors in ER calculation sheets, missing monitoring parameters, and inconsistent PDD references

Credit Vintages

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