Nameplate capacity
375 MW
Rank in Hawaii
#2
of 76 plants
In service since
1959
September 1959
Details
- Primary fuel
- Other
- Technology
- Petroleum Liquids
- Operator
- Hawaiian Electric Co Inc
- County
- Honolulu County
- Generating units
- 6
- Share of state capacity
- 10.15%
- Rank among other plants in Hawaii
- #2 of 25
- EIA plant code
- 766
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| W7 | Petroleum Liquids | 82 MW | 78 MW | 1966 | Operating |
| W8 | Petroleum Liquids | 82 MW | 78 MW | 1968 | Operating |
| W5 | Petroleum Liquids | 54 MW | 52 MW | 1959 | Operating |
| W6 | Petroleum Liquids | 54 MW | 52 MW | 1961 | Operating |
| W10 | Petroleum Liquids | 51 MW | 51 MW | 1973 | Operating |
| W9 | Petroleum Liquids | 51 MW | 51 MW | 1973 | 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
| Kahe | Other | 610 MW |
| Kalaeloa Cogen Plant | Other | 299 MW |
| Maalaea | Other | 230 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 375 MW solar plant and a 375 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