Project Overview Plus Power has brought online a 185 MW / 565 MWh state-of-the-art battery energy storage system that provides clean, firm capacity to the Hawaiian Electric Company. The Kapolei Energy Storage ("KES")
Energy storage developer Plus Power has begun operating its 185 MW/565 MWh Kapolei Energy Storage facility on Oahu, Hawai''i, part of the state''s strategy to replace a
Discover the groundbreaking Kapolei Energy Storage facility in Hawaii, the world''s most advanced grid-scale battery energy storage system.
Hawaii Island''s second solar plus battery storage project, Innergex Renewable Energy, Inc. Hale Kuawehi Solar and Battery Storage Project, started commercial operations on March 25 and is currently
Innergex''s Hale Kuawehi solar-plus-storage project in Hawaii. Image: Innergex Independent power producer (IPP) Innergex Renewable Energy''s 30MW/120MWh Hale Kuawehi battery energy
Hawaii is coming closer to its renewable energy goals with the commercial operation of a solar-plus-storage project on the island of Hawaii. The 30 MW, 120 MWh Hale Kuawehi solar-plus-storage project
The electricity produced by the Hale Kuawehi Solar and Battery Storage Project is sold under a 25-year power purchase agreement with Hawaii Electric Light Company, Inc. About Innergex Renewable
A 185 MW/565 MWh battery energy storage system (BESS) recently started operating in Oahu, Hawaii, providing balancing services to support the island''s growing share of solar generation. Stakeholders
Learn about the Kapolei Energy Storage plant, the world''s most advanced battery energy storage system. Read how this innovative project accelerates Hawaii''s shift to 100% renewable energy.
The KES project will have a lifespan of at least 20 years. KES will be augmented within the existing project layout with supplemental battery storage units to maintain expected performance. At the end of the
A large lithium-ion battery storage project that contributes to grid stability and supports the integration of renewable energy, Leighton Buzzard Battery Storage Park is a 6,000kW energy storage project wholly
The project''s 50MWh BESS, pictured on the morning of 9 April as the inauguration of the project took place. Image: HECO via X/Twitter AES Corporation has brought into commercial operation one of several
Innergex''s Hale Kuawehi solar-plus-storage project in Hawaii. Image: Innergex Independent power producer (IPP) Innergex Renewable Energy''s 30MW/120MWh Hale
The Kapolei Energy Storage project is a landmark energy storage project on the island of Oahu. It aims to enhance the reliability of the electric grid while facilitating the
The electricity produced by the Hale Kuawehi Solar and Battery Storage Project is sold under a 25-year power purchase agreement with Hawaii Electric Light Company, Inc.
It will be coupled with a battery energy storage system of 120 MWh. The complex will be run under a 25-year power purchase agreement with Hawaii Electric Light Company. Innergex said it plans to
Pioneering 565-MWh battery storage facility now online in Hawai''i, Plus Power says "This is the first time a standalone battery site has provided grid-forming services at this
A solar-plus-storage project on the island of O''ahu, Hawaii, deployed by Wartsila. Image: Clearway. Hawaii''s main utility Hawaiian Electric has entered into contract negotiations with the developers of 15
Mililani I was Oahu''s first operational, utility-scale solar and battery storage power plant, which is designed to provide clean energy to the grid even after the sun sets and further advance the state''s goal of 100% renewable
The new Hoohana Solar project started commercial operations on July 11, 2025, marking the completion of the first stage of grid-scale renewable energy systems brought
A Tesla Megapack battery system has officially turned on to replace Hawaii''s very last coal power plant. In early 2022, we reported that Tesla is deploying Megapacks at a new energy storage
A large grid-scale energy storage project in Hawaii, featuring Tesla Megapacks, could potentially minimize the curtailment of renewables output.
One type of energy storage is battery energy storage systems, also known as battery storage. This storage technology uses batteries to capture and store electricity, either via a large utility-scale
The Kapolei Energy Storage facility on Oahu, Hawaii is now operational, according to Plus Power. The company is calling it the most advanced grid-scale battery energy storage system in the world.
Today, AES Hawaiʻi celebrated the launch of its West O''ahu solar-plus-storage project in Kapolei – the company''s first facility to combine solar generation and battery energy
Kapolei Energy Storage facility by Plus Power is now operational in Hawaii. This advanced battery system is propelling the state''s clean energy transition.
Mililani I was Oahu''s first operational, utility-scale solar and battery storage power plant, which is designed to provide clean energy to the grid even after the sun sets and further advance the
The Innergex Renewable Energy, Inc. (Innergex) Hale Kuawehi Solar and Battery Storage Project began commercial operations on March 25, 2025 and is producing up
The Keʻāmuku Solar + Storage project is a proposed 86 MW solar photo-voltaic array and 344 MWh Battery Energy Storage System (BESS) that will be developed and operated by AES
Five new solar-generation projects with battery energy storage systems ranging in size from 35 MWh to 240 MWh are expected to come online in Oahu in 2024, according to Hawaiian Electric''s Renewable Project Status
An Innergex solar project in Hawaii. Image: Innergex Innergex Renewable Energy has closed a US$100 million bridge loan for the Hale Kuawehi battery energy storage
A storage battery project has not yet proven its effectiveness at scale, according to Bob Rudd, the chief commercial officer at Plus Power. The battery's capacity will help address the issue of clean energy curtailment, also known as over-generation, for Hawaiian Electric, Rudd said.
The Kapolei Energy Storage project is a utility-scale battery farm with a storage capacity of 565 megawatt-hours of electricity, making it the largest storage project in Hawaiʻi. It officially went online before the holidays after several delays.
Now Hawaii has an answer: It’s a gigantic battery, unlike the gigantic batteries that have been built before. The Kapolei Energy Storage system came online last month after some setbacks. (Courtesy: Plus Power)
Brandon Keefe, Executive Chairman of Plus Power, hailed this achievement as a “landmark milestone in the transition to clean energy.” The KES battery project, spread across 8 acres near Honolulu, brings a total power capacity of 185 megawatts and 565 megawatt-hours of electricity, serving as an electrical “shock absorber” for Oahu’s power grid.
This project is a postcard from the future – batteries will soon be providing these services, at scale, on the mainland.” Located on 8 acres of industrial land on the southwest side of Oahu, the project is comprised of 158 Tesla Megapack 2 XL lithium-ferro-phosphate batteries, each about the size of a shipping container.
The KES batteries play a crucial role in reducing the curtailment of renewable energy by 69%, allowing Hawaiian Electric to integrate 10% more new utility-scale renewables than previously projected. Additionally, the project is estimated to save customers money, reducing electric bills by an average of $0.28 per month over a 20-year contract life.
