The Redox Flow Battery (RF battery) of Sumitomo Electric Industries, Ltd., has been selected as a grid-scale battery for a power system stabilization project by SHIN-IDEMITSU Co., Ltd. (IDEX). Construction for this project has now commenced in Tamana District, Kumamoto Prefecture, Kyushu.
The RF battery was adopted as part of IDEX’s efforts to enhance the supply of renewable energy. This project marks the first redox flow battery ever approved under Japan’s Ministry of Economy, Trade and Industry (METI) – and the Agency for Natural Resources and Energy’s subsidy program for grid-scale energy storage batteries. The RF battery will be installed at the Nagasu Energy Storage Facility. Completion is scheduled for October 2026, which features a capacity of 8,000 kWh (2,000 kW × 4 hours).
