Successive-return remediation and evidence assurance
PortfolioCheck keeps hazard, exposure, vulnerability and evidence assurance separate. A sea, river, rainfall regime or heat climate does not become safer because a bank uploads a document. Only the measure-specific vulnerability or damage reduction can receive credit.
Governance status: this is a proposed pilot methodology, not a Bank of Ghana rule.
The stage percentages require BoG approval, Ghana-specific calibration, independent validation and periodic review.
Evidence stages
| Stage | Assurance | Minimum evidence |
|---|---|---|
| Declared / planned | 0% | Action owner, target asset, measure and completion date. |
| Completed — documentary evidence | 25% | Dated geotagged photographs plus invoice or completion record. |
| Technically reviewed | 60% | Design/as-built record reviewed by a competent independent professional. |
| Operationally verified | 85% | Site inspection or commissioning record plus maintenance responsibility. |
| Performance verified | 100% | Measured performance or post-event evidence against a documented baseline. |
Scoring formula
effective_credit = engineering_credit × evidence_score / 100
The engineering credit is hazard- and measure-specific. Multiple measures combine on residual vulnerability, are capped, and are checked for overlapping effects. Entering an activity gives no credit; successive-return recalculation occurs only after completion and accepted evidence.
Supervisory workflow
- Bank records an asset-level action and target date.
- Bank submits evidence metadata and a document fingerprint.
- Evidence is reviewed, accepted, rejected or sampled.
- The next return recalculates the asset using the accepted stage.
- Expired evidence or failed maintenance reverses the credit.
- Submission hash, methodology version and evidence decision remain in the audit trail.
Research basis
- Bank of Ghana Climate-Related Financial Risk Directive (2024): risk identification, monitoring, physical-risk data, methodology and semi-annual returns.
- Bank of Ghana ICAAP guidance: adequacy of climate-risk mitigants, risk transfer and buffers.
- IFRS S2 and 2025 transition-plan guidance: actions, resources, targets and progress, including adaptation.
- EBA Guidelines on management of ESG risks (2025): plans to identify, measure, manage and monitor ESG risks.
- MDB joint adaptation-finance methodology and World Bank Resilience Rating System: climate context, activity linkage, monitoring and confidence in resilience.