French renewable power producer and developer Akuo Energy has commissioned a 29.2MWh battery energy storage system (BESS) in Tonga, several weeks after powering up a 19MWh project in Martinique.
The Tonga 1 and Tonga 2 storage systems are on Tongatapu, the main island in the archipelagic South Pacific nation, and connect to the grid of public operator Tonga Power Limited.
The two total 16.5MW of power and 29.2MWh of energy making this the largest BESS in the South Pacific, Akuo said. Both individual systems comprise Akuo’s Storage GEM modular containerised solution, three for Tonga 1 and five for Tonga 2.
Tonga 1 is a 9.3MW/5.3MWh designed to improve grid stability, with a duration of just 34 minutes. Tonga 2 is a 3.3-hour system with 7.2MW/23.9MWh of energy, designed primarily for load shifting.
They have already allowed Tonga to double its renewable energy capacity with the recent addition of 6MW in solar PV power, bringing the country’s renewable mix to around 20%. It aims for 70% by 2030.