Tokyo Asset Solution has announced the launch of two energy storage projects totalling 13.2MWh, marking its first entry into this segment of the energy sector. The company plans to install a 4.9MWh standalone system in Hachioji, western Tokyo, and an 8.3MWh co-located system in Kumamoto Prefecture, at its Misumi solar plant site.
A project supported by a JPY234mn government subsidy
The Kumamoto project will be integrated with the existing 2MWAC/2.2MWDC solar plant in Uki. The site was certified under the Feed-in Tariff (FIT) scheme in fiscal year 2013, at a purchase rate of 36 JPY/kWh valid for 20 years. Commissioned in December 2015, the plant is under contract until December 2035. The upgrade, including the storage system, will enable a transition to the market-based Feed-in Premium (FIP) scheme.
The Kumamoto storage system will use battery energy storage systems (BESS) supplied by Japanese manufacturer PowerX. Engineering, procurement, and construction (EPC) will be carried out by Fuji Sangyo, while Nippon Steel Engineering will manage asset aggregation. Commissioning is scheduled for May 2026. The project is funded with JPY234mn ($1.55mn) from the Ministry of Economy, Trade and Industry (METI)’s supplementary budget for fiscal year 2024.
Tokyo hosts a rare urban storage project
The second project, located in Hachioji, will be one of the few grid-scale storage systems developed within Tokyo’s metropolitan area. This 4.9MWh facility will use batteries supplied by Chinese company BYD. GPSS Engineering will be responsible for EPC works. Once operational, Digital Grid will handle market trading optimisation. The system is expected to come online in August 2026.
This project forms part of a broader trend to enhance energy resilience in urban areas, while responding to evolving regulatory frameworks and new storage incentives.
A diversification strategy launched a decade after solar
Founded in 2009, Tokyo Asset Solution expanded into solar power in 2015. In addition to the Kumamoto site, it owns two similarly sized solar plants in Iwaki, Fukushima Prefecture, and Chitose, on Hokkaido island. In 2022, the company also commissioned 18 micro wind turbines totalling 337kW in Hokkaido, as part of a decentralised production approach.
With these new projects, Tokyo Asset Solution strengthens its position in the energy value chain and anticipates growth in flexibility markets, particularly in areas where storage capacity remains limited.
