Kapolei Energy Storage — Plant Summary
- EIA Plant ID
- 66067
- Capacity
- 185 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Honolulu, HI
- Operating Since
- 2023
- Generators
- 1
- Operator
- Kapolei Energy Storage I, LLC
- Parent Company
- —
- Annual Generation
- -18,716 MWh
- Capacity Factor
- -1.2%
- Balancing Authority
- Hawaiian Electric Co Inc
- ISO/RTO
- —
- NERC Region
- —
Kapolei Energy Storage
OperatingBESS
Ranked #1 of 14 BESS plants in HI#209 of 837 nationally
185 MW BESS operating in Honolulu, HI — Hawaiian Electric Co Inc
EIA
185 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Location
Coordinates
21.3284, -158.1052
County
Honolulu, HI
Nearby Plants
- Kapolei Solar Energy ParkSolar1 MW · 1.5 km
- Hawaii CogenWaste Oil12.2 MW · 2.1 km
- Kalaeloa Solar TwoSolar5 MW · 2.1 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Kapolei Energy Storage I, LLC | — | — |
| Owner(s) | Kapolei Energy Storage I, LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
—
Balancing Authority
Hawaiian Electric Co Inc
Grid Voltage
138 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
−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.
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Hazards·flooding
Flash Flood Warning: Oahu in Honolulu, HI
Flash Flood Warning issued March 21 at 8:40AM HST until March 21 at 11:00AM HST by NWS Honolulu HI
NWS Honolulu HI·5 days ago
Hazards·flooding
Flood Watch: Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; M
Flood Watch issued March 21 at 3:53AM HST until March 22 at 6:00PM HST by NWS Honolulu HI
NWS Honolulu HI·5 days ago
Industry
Kapolei Energy Storage: Powering Hawaii's Future Sustainably
Explore Hawaii's clean energy future with the Kapolei Energy Storage (KES) facility—innovative and resilient, reducing bills and phasing out...
Battery Technology·2 years ago
Grid·capacity addition
World’s Most Advanced Battery Energy Storage System Replace Hawaii’s Last Coal Plant
In a groundbreaking leap towards sustainability, Plus Power's Kapolei Energy Storage (KES) facility in Hawaii has commenced commercial...
Plus Power (developer)
CarbonCredits.com·2 years ago
Last updated 2026-03-21
View all 10 articles