GS Yuasa, the Kyoto-based Japanese battery manufacturer with experience from lead-acid and lithium-ion battery chemistry for a variety of vehicles, and for aviation and space applications, announced a new order of a 50MWh lithium-ion battery storage system for the Tsunokobaru Power Storage Station in Ōita at the island Kuyshu in Japan.
Japan has seen an increase of renewable energy sources. As in many other markets this means challenges related to power grid stability. The BESS commissioned by Chiyoda Corporation for Nijio Co. Ltd., a subsidiary of Tokyo Gas Co., Ltd. is hoped to play a pivotal role in harnessing the full potential of renewable energy sources by effectively managing the power supply-demand balance.
The Tsunokobaru battery project is supported by the Sustainable Open Innovation Initiative (SII) – an industry association with governmental support. The station will be equipped by GS Yuasa with containerised energy storage systems (ESS) with lithium-ion batteries from Yuasa’s LEPS-2-14 series with a scheduled output of 25 MW.
The system includes comprehensive safety monitoring of all cell voltages and module temperatures. Its fan-less modules reduce malfunctions and parts replacement needs. The modules are housed in fire prevention compliant cubicles and are resilient to severely cold climates. Every module is equipped with a battery monitoring PCB that measures cell voltage and module temperature, protecting the battery in case of overcharge, overdischarge or excessive heating. GS Yuasa ensures system reliability through constant voltage and failure monitoring.
The start of construction of the Tsunokobaru project will be in May 2026 and the BESS should be operating in FY 2026. Yuasa also foresees new projects to store renewable energy from sources like tidal and wave energy. GS Yuasa offers lithium-manganese chemistry to secure high energy density and good charging/discharging properties for high voltage systems up to 1500V DC.
Illustration: GS Yuasa, planned 50 MWh battery storage system at Kyushu island
