A solar-plus-storage project combining 300kW of PV and a 2MWh battery energy storage system (BESS) has been installed in the Polynesian archipelago nation of Tonga.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.
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.
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).
Is TPL the most profitable SOE in Tonga?As Tonga’s most profitable SOE, there is good reason to believe that TPL has the commercial capacity, technical capacity and financial incentive to sustain, maintain and further develop OIREP assets beyond the life of the project given the revenue they can generate.
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.
How did the oirep project impact Tonga?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 co
Jul 31, 2024 · The batteries were deliberately sized to provide power capacity (kW) similar to the solar PV capacity, and energy capacity (kWh) roughly double the power capacity – which is
Export PriceJul 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
Export PriceThe storage facility played a key role in the days that followed the volcanic eruption of January 2022 (which was followed by an explosion and a tsunami) by avoiding an outage of the entire power grid. It also helped
Export PriceJul 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
Export PriceTHE PROGRESS AS OF MARCH 2021 TREP 03 Lot 1- 350kW solar PV facility and 400kW/900kwh BESS at ''Eua, 300kW solar PV facility and 900 kW/450 kWh BESS at Vava''u The component is leading by Tonga Power
Export PriceOct 6, 2025 · 2016 – 2018: Feasibility Study and Procurement Feasibility study objectives aligned with TERM. Significant solar variability due to cloud cover. High load growth of ~5% per
Export PriceThe storage facility played a key role in the days that followed the volcanic eruption of January 2022 (which was followed by an explosion and a tsunami) by avoiding an outage of the entire
Export PriceJun 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:
Export PriceTonga photovoltaic energy storage project. A solar-plus-storage project combining 300kW of PV and a 2MWh battery energy storage system (BESS) has been installed in the Polynesian
Export PriceTHE PROGRESS AS OF MARCH 2021 TREP 03 Lot 1- 350kW solar PV facility and 400kW/900kwh BESS at ''Eua, 300kW solar PV facility and 900 kW/450 kWh BESS at Vava''u
Export PriceBattery Energy Storage Systems are a vital component to reaching Tonga''s 50% Renewable Energy target by end of year 2020. Battery Energy storage systems will be able to store
Export PriceMar 16, 2023 · The inauguration ceremony for the solar-plus-storage unit. Image: Prime Minister''s Office of the Government of the Kingdom of Tonga. A solar-plus-storage project combining 300kW of PV and a 2MWh battery
Export PriceMar 16, 2023 · The inauguration ceremony for the solar-plus-storage unit. Image: Prime Minister''s Office of the Government of the Kingdom of Tonga. A solar-plus-storage project combining
Export PriceOct 27, 2024 · The project will deliver utility-scale storage systems to provide base load response and grid stability, paving the way for more A solar-plus-storage project combining 300kW of
Export Price
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.
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 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).
As Tonga’s most profitable SOE, there is good reason to believe that TPL has the commercial capacity, technical capacity and financial incentive to sustain, maintain and further develop OIREP assets beyond the life of the project given the revenue they can generate.
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.
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.
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