Mililani South Solar Farm
Solar power plant · Honolulu County, Hawaii
Nameplate capacity
78 MW
Rank in Hawaii
#12
of 76 plants
In service since
2022
July 2022
Details
- Primary fuel
- Solar
- Technology
- Solar Photovoltaic
- Operator
- Mililani I Solar LLC
- County
- Honolulu County
- Generating units
- 2
- Share of state capacity
- 2.11%
- Rank among solar plants in Hawaii
- #2 of 29
- EIA plant code
- 57242
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | 39 MW | 39 MW | 2022 | Operating |
| 2 | Batteries | 39 MW | 39 MW | 2022 | 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
| Port Allen (HI) | Other | 90 MW |
| Keahole | Other | 89 MW |
| Hale Kuawehi Solar Hybrid | Solar | 74 MW |
| Waiawa Solar Power Hybrid | Battery storage | 72 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 78 MW solar plant and a 78 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