Not rated — no significant reservoirs
Guinea-Bissau is set aside from the ranking rather than graded. Having no significant reservoir storage is a geographic fact, not a transparency failure — so assigning an “F” would be misleading.
H1 2026 Evaluation
Guinea-Bissau Reservoir Transparency
N/AWhy it's not rated
No large operational dams (the Corubal/Saltinho and Geba projects remain unbuilt).
Where its water comes from
Groundwater supplied via EAGB.
Reference source
EAGB — Electricidade e Águas da Guiné-Bissau
https://www.aquacoope.org/gwh/en/iwrm-guinea-bissau-gwEvaluator notes
Guinea-Bissau sits at the structural floor of the RTI ranking for a straightforward reason: the country has no significant operational surface reservoirs, and consequently no national system for monitoring or publishing reservoir-level data. The economy and electricity infrastructure are severely underdeveloped — EAGB, the state utility, operates intermittently and publishes no hydrological data portal. The planned Corubal River (Saltinho) HPP and the Geba River multipurpose dam both remain at pre-construction stages as of 2026, so the infrastructure precondition for reservoir transparency does not yet exist. The sole international data touchpoint is the OMVG river-basin organisation, which covers Guinea-Bissau alongside Guinea-Conakry, Senegal, and The Gambia. OMVG project documents and basin-level hydrological analyses exist, but these are not published by Guinea-Bissau as a sovereign dataset. Satellite altimetry (DAHITI) provides water-level time series for some inland water bodies, offering a partial external substitute. This evaluation should be revisited once the Corubal HPP construction progresses and a national data infrastructure mandate can be assessed.
Evaluated by Jaime Delgado · 2026-09-15 · Methodology v1.3.0