Kapolei Energy Storage
Battery storage power plant · Honolulu County, Hawaii
Nameplate capacity
185 MW
Rank in Hawaii
#5
of 76 plants
In service since
2023
December 2023
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Kapolei Energy Storage I, LLC
- County
- Honolulu County
- Generating units
- 1
- Share of state capacity
- 5.01%
- Rank among battery storage plants in Hawaii
- #1 of 6
- EIA plant code
- 66067
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| KES1 | Batteries | 185 MW | 185 MW | 2023 | 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
| Kalaeloa Cogen Plant | Other | 299 MW |
| Maalaea | Other | 230 MW |
| AES Maui Kuihelani Solar Hybrid | Battery storage | 120 MW |
| Ho'Ohana Solar 1 | Solar | 117 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 185 MW solar plant and a 185 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