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185 MW BESS operating in Honolulu, HI
Outside CONUS — spatial-market dimensions not provided by this dataset.
185 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Coordinates
21.3284, -158.1052
County
Honolulu, HI
Nearby Plants
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| 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
Grid Region
Hawaii
Market
Bilateral Market
NERC Region
—
Balancing Authority
Hawaiian Electric Co Inc (HECO)
Grid Voltage
138.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
−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.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $251.8M
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This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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