185 MW BESS operating in Honolulu, HI — Hawaiian Electric Co Inc
185 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Coordinates
21.3284, -158.1052
County
Honolulu, HI
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Kapolei Energy Storage I, LLC | — | — |
| Owner(s) | Kapolei Energy Storage I, LLC | — | — |
| Status | Operating | — | — |
Kapolei Energy Storage is a battery energy storage system (BESS) located in Honolulu County, Hawaii. The plant, which began operating in 2023, has a total capacity of 185 MW and is operated by Kapolei Energy Storage I, LLC. It is the largest of three battery storage plants in Hawaii, and ranks 338th nationally out of 514 such facilities.
The facility consists of a single generator utilizing lithium-ion battery (LIB) chemistry. The BESS has a total storage capacity of 565 MWh, providing a duration of approximately 3.05 hours at full output. The plant operates within the balancing authority of Hawaiian Electric Co Inc. The plant's primary fuel is listed as 'MWH', indicating that it draws power from the grid to charge its batteries.
Generated from EIA, GEM, and public data sources
NERC Region
—
Balancing Authority
Hawaiian Electric Co Inc
Grid Voltage
138 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
−1.4K MWh
Net Charging
-18.7K MWh
Annual Net Energy
-1.2%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
Last updated 2026-03-14
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