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. The project on the island of Vava'u was commissioned by Tonga Power Limited (TPL), the country's sole.
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The proposed project will combine wind, solar, battery energy storage and green hydrogen to help local industry decarbonise. It includes an option to expand the connection to 1,200MW. Endesa will build five solar plants and five wind plants supported by a battery.
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The project will deliver utility-scale storage systems to provide base load response and grid stability, paving the way for more renewable energy integration in the main island, while green mini-grids will be installed in the outer islands.
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Although using energy storage is never 100% efficient—some energy is always lost in converting energy and retrieving it—storage allows the flexible use of energy at different times from when it was generated.
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