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

August 28, 2026
Nomad Power Solutions has announced that the US Department of Energy (DOE) Office of Electricity has authorised the advancement of an energy storage demonstration project in Vermont.
August 28, 2026
A roundup of some of the best user-posted views, analysis and reveals from across the energy storage community in the past week.
August 27, 2026
Lithium-ion (Li-ion) battery cathode material producer Nano One has reaffirmed its strategy for addressing growing demand for lithium iron phosphate (LFP) cathode active materials outside China, focusing on a licensing-based approach through regional development company partnerships.
August 27, 2026
AEMO has published its 2026 ESOO, finding a clearer pathway to maintaining a reliable electricity supply across the NEM in the coming decade.
August 26, 2026
In this news roundup, Eos and WATTMORE; Gotion and Gamma Technologies; Middle River Power and PowerTransitions; and Electra AI and MinTech are advancing battery energy storage system (BESS) technology in the US.