Ganzhou Swine Farm Animal Manure Management System GHG Mitigation Project

Audit Analysis

The Ganzhou swine-farm biogas project has a VVB-confirmed additionality assessment and no material findings, but suffers from significant MRV gaps (18 corrective actions), a project-specific modeled baseline with no stated buffer pool or leakage percentage, and a serious contradiction in the crediting period (5 vs 20 years) that raises over-crediting concerns. The project delivered roughly 80% of the pro-rata ex-ante expectation under the 5-year crediting period, which is reasonable, but the unresolved crediting-period discrepancy undermines confidence in the credit volume.

Project Description

Red Flags

• ⚠Crediting period contradiction: the verification report (Dec 2022) states a 5-year period (Oct 2020–Sep 2025) while a later monitoring report (Dec 2024) states a 20-year period (Dec 2022–Nov 2042); if the 20-year figure is correct, the verified ERR of 400,450 tCO₂e represents ~321% of the pro-rata ex-ante expectation, indicating potential over-crediting.
• ⚠18 corrective actions were raised by the VVB, including missing cross-check results, measurement methods not aligned with the PDD, missing DCS system descriptions, and an unverified claim that grid electricity was consumed when it was not sourced from the grid.
• ⚠No buffer pool percentage, no reversal-event record, and no quantified leakage deduction percentage are stated in the available documents, leaving permanence and leakage protection unverified.
• ⚠ERR figures differ between two monitoring reports (400,450 vs 309,144 tCO₂e) and between two verification reports (400,450 vs 309,144 tCO₂e), indicating data inconsistency across reporting periods.

Credit Vintages