Wailuku River Hydroelectric
Hydro power plant · Hawaii County, Hawaii
Nameplate capacity
10 MW
Rank in Hawaii
#48
of 76 plants
In service since
1993
May 1993
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Wailuku Holding Company LLC
- County
- Hawaii County
- Generating units
- 2
- Share of state capacity
- 0.28%
- Rank among hydro plants in Hawaii
- #1 of 8
- EIA plant code
- 54827
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 8101 | Conventional Hydroelectric | 5.2 MW | 4.9 MW | 1993 | Operating |
| 8102 | Conventional Hydroelectric | 5.2 MW | 4.9 MW | 1993 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Hawaii
| Hawi Wind Farm | Wind | 11 MW |
| Miki Basin | Other | 10 MW |
| Biomass to Energy Facility, Kauai | Other | 10 MW |
| HNL Emergency Power Facility | Other | 10 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 10 MW solar plant and a 10 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Hawaii power plants · What Hawaii actually generates