
The Sunergise 6 MW IPP Solar Generation Systems is a photovoltaic power plant in Kolovai, Tongatapu, Tonga. It is the largest photovoltaic power plant in South Pacific. . The between Sunergise New Zealand and Tonga Power Limited with the support of was signed on 21 March 2019. The power. . The power plant has an installed capacity of 6.9 MWp, making it the largest photovoltaic power plant in south . It. . • [pdf]
Renewables like solar are a significant means for Tonga to expand energy access, stabilize power grids as well as reduce pollution. Considering the shortage of solar expertise and finances for countries like Togan, the role of independent power producers and the practice of PPA provide solid support to smooth the way for solar deployment.
Tongan King Tupou VI at the official opening of the biggest solar power plant in the South Pacific. Photo / Sunergise Tongan Prime Minister Hu’akavameiliku Siaosi Sovaleni, who was also at the launch, said the plant indicates the need for independent power - like solar energy - to achieve their National Energy Roadmap.
Tongan King Tupou VI was among the dignitaries who celebrated the official launching of the solar farm on the country’s main island - Tongatapu - this week. Kiwi company Sunergise NZ Ltd worked alongside Tonga Power Ltd to implement the 6 megawatt solar power plant as part of a power purchase agreement, with support form the Asian Development Bank.
This solar project was completed under the partnership between Sunergise New Zealand Limited and Tonga Power Limited with support from the Asian Development Bank (ADB). Sunergise led the construction and meanwhile united local Tongan civil, mechanical and electrical sub-contractors to the team.
As Hu'akavameiliku, Prime Minister of Tonga said at the ceremony: "The successful completion of the Sunergise's 6MW Independent Power Producer solar generation system today, demonstrates the major role renewable energy independent power producers play towards achieving our 70% target by [the] end of [the] year 2025."
Tongan Prime Minister Hu’akavameiliku Siaosi Sovaleni, who was also at the launch, said the plant indicates the need for independent power - like solar energy - to achieve their National Energy Roadmap. There is an aim to have up to 70 per cent renewable energy use in Tongatapu by the end of 2025.

A fully sustainable energy system for the Åland islands is possible by 2030 based on the assumptions in this study. Several scenarios were constructed for the future energy system based on various combinations o. . ••A fully sustainable energy system for the Åland Islands is possible by. . RE renewable energyESS energy storage solutionsPV . . Islands and regions of archipelago represent interesting case studies on sustainable energy systems. Firstly, they tend to be compact geographic areas with homogeneous po. . The methodology of this study is divided into four main sections. A short description of the EnergyPLAN advanced energy system analysis computer model [18] will be followed by a. . Table 3, Table 4, Table 5 show the installed capacities of major technologies that resulted in least cost solutions for each scenario after iteration. In addition, simplified flows o. [pdf]
In order to evaluate the financial feasibility of integrating energy storage systems with solar PV system in detached houses, economic indicators able to compare the costs of the different storage scenarios with one another are needed.
While the costs of all energy storage systems remain too high to be considered financially attractive without further support mechanisms, LIB storage is clearly the best storage alternative in all scenarios with a LCC 1000–7500 € higher and a LCOE 0.005–0.04 €/kWh higher than the costs of a 13.5 kW stand-alone solar PV system.
Hence, the optimal capacity of all the energy storage systems is zero, whereas the feasible solar PV size is limited to below 20 % when using the 2019 electricity prices as comparison.
For the battery storage system, a 90 % round-trip efficiency was used, representing the use of a generic LIB , . For the H 2 energy storage system, a 30 % round-trip efficiency was used, a value that could also be lower for small-scale energy storage applications.
Solar PV systems without selling surplus electricity to the grid were profitable up to a renewable fraction of 10 % with 2019 market prices and up to 35 % with the 2021 unusually high market prices.
While LIB storage clearly remains the most feasible energy storage technology with a LCOS of 3–5 times higher than the LCOE of grid electricity, the LCOS of the discharged energy from the H 2 storage and TES system is between 5 and 20 times higher than that of grid electricity.

The Ayémé Solar Power Station is a proposed 120 megawatts plant in Gabon. The power station is under development by Solen, an (IPP). The solar farm will be developed in two phases of 60 megawatts each. The energy generated at this power station is expected to be sold to the Energy and Water Company of Gabon (Société d’Energie et d’Eau du Gabon) (SEEG), for distribution in , the capital city of the county and its surro. [pdf]
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