Cook Islands latest Pacific territory to use batteries and solar to replace diesel

LinkedIn
Twitter
Reddit
Facebook
Email
Rarotonga, capital of the Cook Islands, where the 5.6MWh project will be located.

The Cook Islands in the Pacific will host a 5.6MWh lithium-ion battery energy storage system for the integration of renewables, in a project funded by the Asian Development Bank, European Union and Global Environmental Fund.

The Cook Islands have, in its government’s own words, a “precarious reliance” on importing diesel to generate electricity. As a Pacific Island nation they are also in the frontline of climate change, with a target and plan in place to eliminate emissions and hit full reliance on renewables by 2020.

The latest project, expected to cost around NZ$4.3 million (US$3.09 million), is considered an important part of that Renewable Energy Sector Project, and is meant to provide the utility of the territory’s biggest island and capital, Rarotonga, with increased flexibility for the integration of renewables on its grid.

Australia headquartered developer MPower has been awarded the contract by the Cook Islands’ government to build the plant, which will be connected to a grid-connected 1MW solar PV plant, Te Mana Ra Solar PV. The company said it will be its biggest battery project to date and is thought to be larger than any single installation so far in its home country. MPower said it would rely on expertise in working on the Pacific Islands it had gained through developing 5MW of PV in Samoa.

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

“We’re pleased to be able to deliver a new era energy to the Cook Islands, employing the latest technologies and building on the renewables program that is well underway,” Nathan Wise, CEO of MPower’s parent company, Tag Pacific Limited, said.

When operational, the plant will be operated and looked after by local workers, which was part of the conditions through which the contract was awarded. The system needs to be able to withstand high temperatures and humidity and will be “physically and operationally modular”, MPower said, implying that it can be scaled up further or other adjustments made in future.

The project is “tentatively” scheduled for completion in the first half of next year. After the design and build phase, MPower will bring in local contractors to work on the project.

8 September 2026
Barcelona, Spain
Battery & Energy Storage Tech Europe (BESTE) is Europe’s industrial scaling platform for stationary and industrial battery applications — not EVs. Taking place 8–9 September 2026 at Fira de Barcelona, BESTE brings together utilities, IPPs, energy-intensive industries, data centres, ports, rail, maritime, defence and aerospace OEMs — all deploying or integrating battery storage at scale. Over 100 companies already confirmed — including EDP Renewables, Acciona, Endesa, Naturgy, Neoen, Galp, Basquevolt and Veolia — alongside 40+ expert speakers and international institutional support from BEPA, BVES, LDES and Volta Foundation. Where Europe’s battery & ES ecosystem turns projects into reality.
15 September 2026
San Diego, USA
You can expect to meet and network with all the key industry players again in 2025 from major US asset owners, operators, RTOs and ISOs, optimizers, software and analytics providers, technical consultancies, O&M technology providers and more.

Read Next

July 31, 2026
Thermal energy storage (TES) technology provider Antora Energy has closed a US$550 million Series C funding round to accelerate deployment of its thermal battery storage systems for industrial facilities and data centres in the US.
July 31, 2026
Environmental services company Veolia has been selected to operate and maintain a 350MW microgrid to power an AI data centre campus in New Albany, Ohio, US, which includes a 430MWh BESS.
July 31, 2026
The State Council of China recently released the 15th Five-Year Carbon Peaking Action Plan, outlining a roadmap for carbon peaking through the Action Plan period.
July 30, 2026
Infrastructure and construction company Aecon Group has executed an agreement with Ontario’s Independent Electricity System Operator (IESO) for the 150MW/1,200MWh Simcoe energy storage project in Norfolk County, Ontario.
July 30, 2026
IPP Eolian has begun construction on Flint Grid, a 200MW/1.06GWh energy storage project in Jersey Township, Licking County, Ohio, US.