RYODEN and JPN ENERGY Integrated System are jointly developing a METI-subsidized 2MW grid-scale battery storage project in Kurayoshi City, Tottori Prefecture, the companies announced on January 30, 2026.
According to the statement, the facility will use Sumitomo Electric’s redox flow batteries. It is expected to be commissioned in May 2027 and operate for 30 years, participating in the wholesale, balancing, and capacity markets. The companies did not disclose the asset’s energy capacity. They plan to establish a joint special purpose company, Kurayoshi Chikudensho LLC, to hold the project.
Data from Sustainable Open Innovation Initiative (SII), the organization implementing the METI subsidy, shows that the project was awarded about 224 million yen in the scheme’s FY2025 round. The program covers one-third of eligible capital expenditures for sub-10MW assets, up to 1 billion yen.
Kurayoshi Power Storage Station is RYODEN’s first known grid-scale BESS project. METI data shows that the TSE Prime-listed technology trading company owns three solar power plants under the feed-in-tariff (FIT) scheme, including a ground-mounted 2MWAC asset in Miyagi Prefecture and a pair of low-voltage rooftop systems at its facilities.
Redox flow batteries have previously been used in, among others, a 17MW/51MWh Hokkaido Electric Power Network project and three 1MW/8MWh Kashiwazaki IR Energy projects in Niigata Prefecture. They have also been selected for a 2MW/8MWh Shin-Idemitsu project that was awarded the METI subsidy in FY2024.
