Hydroelectric power plants in Hawaii
6 operating hydroelectric power plants in Hawaii with 28 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.
Plants
6
Hydroelectric capacity
28 MW
Net generation, 2025
70.3 GWh
Largest hydroelectric power plants in Hawaii
| # | Plant | Hydroelectric MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Wailuku River HydroelectricHawaii County | 10 | 14.1 | 15.5% |
| 2 | Gay RobinsonKauai County | 7.7 | 35.6 | 46.7% |
| 3 | Wainiha HydroKauai County | 3.6 | 19.1 | 60.6% |
| 4 | PuueoHawaii County | 3.1 | 1.0 | 3.8% |
| 5 | Kalaheo HydroKauai County | 2.0 | 0.5 | 2.6% |
| 6 | Waiau HydroHawaii County | 1.0 | 0.0 | – |
Projects where hydroelectric is the largest fuel or at least a fifth of nameplate capacity. MW is hydroelectric nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources