SÜTAS TIRE BIOGAS PLANT

Audit Analysis

The Sütas Tire Biogas Plant is a Gold Standard manure-to-biogas project with a VVB-confirmed investment additionality test, but it carries moderate integrity and transparency risks due to a project-specific modeled baseline, a thin 0% leakage justification, the absence of a buffer pool, and a significant discrepancy between the original PDD lifetime estimate (574,257 tCO₂e) and the later monitoring-report figure (206,361 tCO₂e). No verified ERR figure is available in the extracted record, and several key MRV parameters (FNRB, usage monitoring method, CORSIA/CCP status) are not stated, limiting the ability to independently assess over-crediting risk.

Project Description

Red Flags

• ⚠The PDD (2020) reports a lifetime ex-ante estimate of 574,257 tCO₂e while the monitoring report (2024) reports 206,361 tCO₂e — a 64% reduction that is not explained in the available documents.
• ⚠No verified ERR figure is present in the extracted record; only the claimed figure of 197,821 tCO₂e (monitoring report, 2025) is available, preventing an independent over- or under-delivery check.
• ⚠Leakage is set at 0% with only a 'deemed negligible' justification in the verification report, while the earlier validation report (2024) did not address leakage at all — a thin basis for a biogas/digester project where methane slip is a known risk.
• ⚠61 Corrective Action Requests and 11 Clarification Requests were raised during validation (all subsequently closed), indicating substantial initial documentation and design weaknesses.

Credit Vintages

No issuances recorded on the registry.