Muyuan Nanyang Swine Farm Animal Waste Management System GHG Mitigation Project

Audit Analysis

A Gold Standard biogas project (ACM0010) at a swine farm in Nanyang, China, with VVB-confirmed additionality and no material findings, but undermined by 24 corrective actions flagging significant MRV gaps, a leakage treatment contradiction between the validation and verification reports, and the absence of a stated buffer pool. The project over-delivers relative to its ex-ante estimate (271% of pro-rata expectation for the 4-month monitoring period), which is reassuring for claim safety, but the volume of unresolved monitoring inconsistencies and missing parameters erodes confidence in the verified figures.

Project Description

Red Flags

• ⚠24 corrective actions issued by the VVB, including mandatory recalculation of PEy, LEy, and ERy due to outdated GWP values, and multiple monitoring parameters inconsistent with the PDD
• ⚠Leakage treatment contradicts between documents: the verification report (Dec 2022) states leakage was quantified, while the validation report (Mar 2022) records it as not addressed; no leakage deduction percentage is provided in either
• ⚠No buffer pool percentage is stated in any available document for a biogas project that carries inherent reversal risk if the digester is decommissioned or underperforms
• ⚠ERR figures differ between the monitoring report (351,149 tCO₂e) and the verification report (427,502 tCO₂e) for the same monitoring period, with no documented explanation for the 76,353 tCO₂e gap

Credit Vintages