The two battery storage facilities installed in Tonga are complementary: the aim of the first 5 MWh / 10 MW battery is to improve the electricity grid's stability (regulating the voltage and frequency), while the second 23 MWh / 7 MW battery is designed to transfer the. The two battery storage facilities installed in Tonga are complementary: the aim of the first 5 MWh / 10 MW battery is to improve the electricity grid's stability (regulating the voltage and frequency), while the second 23 MWh / 7 MW battery is designed to transfer the. The two battery storage facilities installed in Tonga are complementary: the aim of the first 5 MWh / 10 MW battery is to improve the electricity grid's stability (regulating the voltage and frequency), while the second 23 MWh / 7 MW battery is designed to transfer the electrical load in order to. The energy storage initiatives in Tonga comprise various undertakings aimed at enhancing the resilience and sustainability of the island nation's energy infrastructure. These projects focus on integrating renewable power sources, particularly solar, into the existing grid. They aim to reduce. Battery Energy Storage Systems (BESS) is a technology developed for storing electricity with the underlying idea being that this stored energy can be utilized at a later time. We are currently working alongside the Tonga Renewable Energy Project to construct Tonga's first ever Battery Energy. This project aims to help Tonga move away from fossil fuels and shift to renewables. The project on the island of Vava'u was commissioned by Tonga Power Limited (TPL), the country's sole electric utility, on 14 March.