Song Ong Hydropower Project

Integrity

Additionality appears reasonably supported because the monitoring report (2023-02-28) states the VVB confirmed additionality using an investment test. However, integrity is weakened by multiple corrective actions indicating methodological/boundary problems, including an incorrect baseline equation and an incomplete project boundary (auxiliary internal consumption) and the need to address likely grid import during outages (monitoring report, 2023-02-28). Leakage is not robustly evidenced: the latest monitoring report treats leakage as negligible, but no leakage deduction percentage is found in the extracted record.

Transparency

Core MRV identifiers are present (VVB name TUV SUD; monitoring period 2018-03-01 to 2019-03-23) in the monitoring report (2023-02-28). Transparency is reduced because total claimed ERs are not found in the extracted record, and the verified ER figure is inconsistent across validation reports (2020-11-07 vs 2023-09-13). The monitoring report (2023-02-28) also notes the VVB could not confirm some evidence because documents were in local language, limiting auditability for external reviewers.

Claim Safety

The project is explicitly not CORSIA-eligible, which lowers the risk of high-impact aviation claims (extracted record). Nonetheless, claim safety is constrained by over-crediting signals: ER totals differ substantially between validation reports (127,120 vs 19,366), and corrective actions highlight boundary and baseline-calculation issues that can change credited volumes (monitoring report, 2023-02-28). Leakage treatment is inconsistent across monitoring reports and not quantified in the extracted record, adding uncertainty to net climate benefit claims.

Documentation

Documentation coverage is moderate-to-good in breadth (PDD, monitoring report, validation report, issuance) with 16 documents used and high extraction confidence (extracted record). However, the monitoring report (2023-02-28) lists many corrective actions requesting missing or unreviewable supporting evidence (grievance register with translation, invoices/plant records for electricity supplied, calibration certificates), indicating that key substantiation was not readily verifiable. The presence of numerous CARs related to the PDD (typos, boundary tables, policy consideration, baseline equation) also suggests quality-control weaknesses in the document set.

Overall

Overall quality is mid-range: additionality is VVB-confirmed and the project is not CORSIA-eligible, but MRV and consistency issues materially increase uncertainty. Contradictions were handled conservatively: for leakage, the more recent monitoring report (2023-02-28) stating leakage is negligible was privileged over the older monitoring report (2020-10-31) saying it was not addressed, but the score is still penalized because no leakage deduction percentage is evidenced. For safeguards and grievance mechanism, the newer monitoring report (2023-02-28) was privileged over the 2012 monitoring report, yet scores were reduced because the historical contradiction suggests evolving or inconsistently recorded practices. For benefit sharing and FPIC, the validation report (2023-09-13) was treated as more authoritative than older monitoring/PDD-era statements, but the contradiction itself lowers confidence. For ER totals (19,366 vs 127,120), the more recent validation report (2023-09-13) was privileged, and the large discrepancy drove a significant downward adjustment to transparency and claim-safety.