This special Japanese market roundup covers large-scale BESS project announcements from PowerX, Eku Energy and SMFL.

The Japanese association of grid operators has selected 19 battery storage projects totalling 1,251MW in the third running of a national capacity market auction.

Japanese telecoms tech company Softbank Corporation has launched a battery cell and battery energy storage system (BESS) manufacturing arm in its home country.

Energy storage developer and system integrator Energy Vault has released its Q1 2026 financial results, showing expansion in its project portfolio, AI infrastructure activities, and operations in Australia and Japan.

Australia, India, Japan, and the Philippines are driving a transformation in the APAC batteryenergy storage market, says Trina Storage.

Sumitomo Electric will supply a vanadium redox flow battery (VRFB) energy storage system to enable grid integration of wind energy in Hokkaido, northern Japan.

HD Renewable Energy and utility Tokyo Gas signed a deal for two large-scale projects in another busy week for Japan’s growing battery storage market.

Energy Vault has entered what it has described as “one of the world’s fastest-growing energy storage markets,” acquiring a portfolio of development projects in Japan.

Amid growing interest in Japan’s battery storage market, a consortium of major Japanese businesses is targeting 174MW of deployments.

Developer-investor Hexa Energy Services has inaugurated what is thought to be Japan’s first operational battery storage project with a capacity market contract.