Led by the Asian Development Bank (ADB) and co-financed by Australia, the European Union, the Second Danish Cooperation Fund for Renewable Energy and Efficiency for Rural Areas, and the Global Climate Facility, 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 electricity on these islands.Can Australia help secure Tonga's outer island energy needs?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.
How many people have access to electricity in Tonga?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.
How can oirep help Tonga's remote island communities?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.
Why is electricity so expensive in Tonga?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).
Why did oirep work with Tonga Power Limited?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.
How many people live in Tonga?Just 36 of Tonga’s islands are inhabited, with more than 70% of the total population residing on just one island – Tongatapu. This means that little more than 30,000 people are spread across 35 islands, presenting acute issues in terms of the provision of modern infrastructu
Jul 10, 2025 · Tonga is making tangible progress toward its renewable energy targets with the rollout of solar-powered mini-grid systems across its outer islands, in a bold move to reduce its dependence on expensive
Mar 16, 2023 · A solar-plus-storage project with a 2MWh battery energy storage system has been installed in Tonga, its first.
In April 2020, Infratec began a two-year project to design, procure and build on-grid solar PV and battery energy storage facilities on the ''Eua and Vava''u islands in the Kingdom of Tonga.
In April 2020, Infratec began a two-year project to design, procure and build on-grid solar PV and battery energy storage facilities on the ''Eua and Vava''u islands in the Kingdom of Tonga.
Oct 6, 2025 · Key lessons from the Tonga Renewable Energy Project for the Pacific Modernised SCADA and control systems are critical when renewable energy contribution approaches 30%.
Jun 20, 2021 · Why This Factory Matters for Tonga (and the Pacific) a coconut drops onto a solar panel in Nuku''alofa. Normally, that''d just be lunch for a hungry crab. But here''s the twist – that
Official Completion Ceremony for Tonga''''s 1st ever The two Battery Energy Storage systems are deliverables of the Tonga Renewable Energy Project (TREP) located in two separate
Jul 10, 2025 · Tonga is making tangible progress toward its renewable energy targets with the rollout of solar-powered mini-grid systems across its outer islands, in a bold move to reduce its
TPL''s Renewable PlantsTonga Power Limited is continuously expanding its Renewable Energy Portfolio, through the introduction of solar generation and most recently Tonga''s first ever large
Mar 16, 2023 · A solar-plus-storage project with a 2MWh battery energy storage system has been installed in Tonga, its first.
Jul 31, 2024 · Led by the Asian Development Bank (ADB) and co-financed by Australia, the European Union, the Second Danish Cooperation Fund for Renewable Energy and Efficiency
Jun 4, 2025 · Tonga Energy Background Current energy grids: Tongatapu, Vava''u, Ha''apai, Eua, and Niua Toputapu (recently turned to solar): powered by diesel generators Solo provider:
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).
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.
Just 36 of Tonga’s islands are inhabited, with more than 70% of the total population residing on just one island – Tongatapu. 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.
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