Tokyo Century to build four additional wholly-owned extra high
Tokyo Century will invest in four wholly-owned extra high-voltage grid-scale battery storage projects totaling 101MW/386.3MWh, the company announced on December 12, 2025.
Tokyo Gas is also participating in the Japanese utility-scale battery energy storage system (BESS) market, signing a 20-year tolling offtake deal with Australian developer Eku Energy for a forthcoming 30MW/120MWh project.
Another Tokyo-headquartered utility, Tokyo Gas, also began a similar programme with residential batteries. The company markets and installs battery storage systems to households, and also has a new solutions service, branded Igniture, which controls the charging and discharging to participate in power supply-demand balancing.
Japan NRG looks at how pumped hydro capacity, a relatively simple energy storage method, is being developed, deployed and traded in new ways to meet Japan's 21st century energy needs. The full deep-dive analysis texts are available in the Japan NRG Weekly report.
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