Kapolei Energy Storage
Kapolei Energy Storage is a battery storage plant in Honolulu County, Hawaii, operated by Kapolei Energy Storage I, LLC. It ranks fifth by nameplate capacity among Hawaii’s 76 power plants. It is the biggest of Hawaii’s 8 battery storage plants. Within the Hawaiian Electric balancing area it is the largest of 23 plants. Its biggest unit, rated at 185 MW, is the largest single generator in Hawaii.
Nameplate capacity, 2025
185 MW
185 MW net summer capacity
1 operable unit
- Battery185 MW100%
Unit by unit, 2023 to 2025
operating in 2025bar height follows unit size
Unit KES1 Battery, 185 MW, 2023
Among Hawaii’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Kahe610 MW
- 2Waiau375 MW
- 3Kalaeloa Cogen Plant299 MW
- 4Maalaea230 MW
- 5Kapolei Energy Storagethis plant
- 6AES Maui Kuihelani Solar Hybrid120 MW
- 7Ho’Ohana Solar 1117 MW
Other rankings
- All US power plants
- 1717th of 14,286
- US battery storage plants
- 58th of 605
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| KES1 | Battery | 185 MW | 185 MW | 2023 | Operating |
Grid and site
- Balancing area
- Hawaiian Electric
- Highest grid connection voltage
- 138 kV
- Nearest town on record
- Kapolei
- Operator type
- Independent producer
- Coordinates
- 21.328°N, 158.105°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Kapolei Solar Energy Park | Solar | 1 MW | 0.9 mi southwest |
| Hawaii Cogen | Oil and petroleum | 12.2 MW | 1.3 mi southwest |
| Kalaeloa Solar Two | Solar | 5 MW | 1.3 mi southeast |
| Campbell Industrial Park | Oil and petroleum | 113 MW | 1.8 mi south |
| Kalaeloa Cogen Plant | Oil and petroleum | 299 MW | 1.9 mi south |
| Tesoro Hawaii | Oil and petroleum | 20 MW | 2.0 mi southeast |
| H Power | Biomass and waste | 100 MW | 2.0 mi south |
| Kahe | Oil and petroleum | 610 MW | 2.5 mi northwest |