The Tonga Independent Shared Energy Storage Project isn''t just a local fix – it''s a blueprint for 41 small island nations worldwide. From Fiji to the Bahamas, energy ministers are
Tonga''s first utility-scale battery energy storage system (BESS) project was officially opened today at an event attended by the South Pacific Kingdom''s prime minister.
OIREP''s focus was installation of solar energy capabilities to nine outer islands of Tonga, with the aim of increasing the reliability, efficiency and affordability of power on these islands.
A special event today marks the official opening of Tonga''s first ever large-scale Battery Energy Storage Systems (BESS) by the Prime Minister Hon. Hu''akavameiliku.
To enable Tonga''''s shift from fossil fuel-based energy generation, the Tonga Renewable Energy Project (TREP) will help install utility scale energy storage systems to facilitate the integration
Each party has proven to be open, forward-looking and able to find solutions to install and commission the largest battery energy storage system in the South Pacific, despite a close of
Tonga independent shared energy storage project back on an agreed buying rate per u it by TPL. This IPP Agreement is a 25 yrs deal. There is no battery storage setup attached to this project.
Battery Energy storage systems will be able to store renewable energy generated from our existing solar and wind generation sites and distribute it to the people of Tonga when required.
NUKU''''ALOFA, TONGA (18th July 2019) -- Tonga''''s first Large scaled Battery Energy Storage System (BESS) will be built at the Popua Power Station after an agreement was signed today
Each party has proven to be open, forward-looking and able to find solutions to install and commission the largest battery energy storage system in the South Pacific, despite a close of

Australia also has a long history of engagement in relation to helping secure Tonga’s outer island energy needs. In the early 2000s, Australia funded the Ha’apai Outer Islands Electrification project (HOIEP), which involved the installation of diesel-powered generators and electrical reticulation on four islands in the Ha’apai group.
This means that little more than 30,000 people are spread across 35 islands, presenting acute issues in terms of the provision of modern infrastructure. At OIREP commencement, the ADB estimated that 89% of all households across Tonga had access to electricity.
However, significant needs and opportunities exist to further expand renewable energy systems on outer islands. Less tangible, but also important is the role played by OIREP in consolidating Tonga’s social contract with remote island dwelling communities, by allowing for enhanced and more reliable access to electricity.
This has contributed to the Tongan economy and electricity consumers being exposed to high and volatile electricity prices due to fluctuations in the price of oil internationally. According to UK-based aggregate website Cable, Tonga's electricity is the 13th most expensive in the world, at an average cost of USD 0.35 per kilowatt hour (kWh).
The project achieved its proposed impact, in terms of helping Tonga reduce its dependence on imported fossil fuel for power generation with OIREP assets estimated to have reduced diesel usage by 0.5 million litres annually. Central to the project outcome was the provision of on-grid and off-grid generation solar power at reduced cost.
OIREP’s on-grid work was always a matter of laying the foundations for further investment in renewables and enjoyed the ease of working through one implementing partner – Tonga Power Limited – who were incentivised to help ensure the program succeeded given they will manage all on-grid assets post-project.
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