Kapolei Energy Storage
Battery storage project in Honolulu County, Hawaii. 185 MW of nameplate capacity across 1 generator, operated by Kapolei Energy Storage I, LLC.
Also known as Kapolei Energy Storage Facility · EIA plant 66067
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 185 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 2023First generator online
- Operator
- Kapolei Energy Storage I, LLCEIA operator ID 65234
- Grid
- HECOBalancing authority HECO
- Price nodes
- None linkedNo verified ISO node
- Location
- Honolulu County, HI21.3284, −158.1052
- EIA plant ID
- 66067EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Kapolei Energy Storage produces
Free · EIA-923Net generation, 2025
−18.7 GWh
−18,716 MWh, final
Battery discharge, 2025
175 GWh
Charge 194 GWh
January to July 2026
−10.2 GWh
Provisional
Range, 2024 to 2025
−19.5–−18.7
GWh a year. Low 2024, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | Not reported | Not reported | 0 of 12 |
| 2022 | Not reported | Not reported | 0 of 12 |
| 2023 | Not reported | Not reported | 0 of 12 |
| 2024 | −19,497 | Not reported | 12 of 12 |
| 2025 | −18,716 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −10,240 | Not reported | 7 of 7 |
* 2026 covers January to July and is provisional. Battery plants can report negative net generation, when charging uses more energy than they discharge.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| KES1 | Batteries | 185.0 | December 2023 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Kapolei Energy Storage I, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about Kapolei Energy Storage
How much power does Kapolei Energy Storage produce?
Kapolei Energy Storage reported −18,716 MWh (−18.7 GWh) of net generation in 2025. From January to July 2026 it reported −10.2 GWh, which is provisional.
Where is Kapolei Energy Storage?
Kapolei Energy Storage is in Honolulu County, Hawaii, at 21.3284, −158.1052. It is in the Hawaiian Electric Co Inc balancing area (HECO).
Who operates Kapolei Energy Storage?
EIA-860M for August 2026 lists Kapolei Energy Storage I, LLC as the operator (EIA operator ID 65234). The operator is not always the owner.
When did Kapolei Energy Storage start operating?
Its first generator began operating in December 2023, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page