ML Power took an undisclosed stake in Mori Trust’s first grid-scale battery project, the 8.7MW/19.7MWh Biwako Power Storage Station, in late April 2026, the company announced on May 7, 2026.
The project, which will be located on a 16,000m2 site in Moriyama City, Shiga Prefecture, is expected to begin commercial operation in the second half of 2027. It will use PowerX battery systems. Construction is expected to begin in summer 2026.
Data released by the Sustainable Open Innovation Initiative (SII), which administers METI’s support scheme for grid-scale battery storage, shows the project was awarded an approximately 323 million yen subsidy in FY2025.
Biwako Power Storage Station follows the 2MW/8MWh Funahashi Power Storage Station that ML Power is developing jointly with Hokuriku Electric Power. The Mizuho Leasing unit also holds stakes in a pair of Tokyo Metropolitan Government-subsidized assets together with Tohoku Electric Power and is developing a 10MW/40MWh project in Hiroshima Prefecture supported by a METI subsidy.
Mori Trust’s direct entry into grid-scale storage development follows its previous investments in Tokyo Metropolitan Government’s public-private fund and battery technology companies PowerX and TerraWatt Technology.
