Battery Station Tomiai

Project Overview

Battery Station Tomiai is a 1.5 MW / 6.3 MWh grid-scale battery energy storage system located in Tomiai-machi, Minami Ward, Kumamoto City, Kumamoto Prefecture, Japan. Developed by Battery Station Kyushu LLC, a joint venture established by JR Kyushu and the Sumitomo Corporation Group, the project was completed on January 30, 2026 and commenced operations in March 2026 after commissioning and operational adjustments. The facility participates in Japan’s ancillary services market and capacity market, supporting renewable energy integration, grid balancing and regional decarbonization efforts in Kyushu. Source: https://www.sumitomocorp.com/en/jp/news/topics/2026/group/20260213

Battery Station Tomiai is a 1.5 MW / 6.3 MWh grid-scale battery energy storage system located in Tomiai-machi, Minami Ward, Kumamoto City, Kumamoto Prefecture, Japan. Developed by Battery Station Kyushu LLC, a joint venture established by JR Kyushu and the Sumitomo Corporation Group, the project was completed on January 30, 2026 and commenced operations in M...