Kansai Electric Power and Sparx Launch Grid-Connected Energy Storage Projects in Mito and Hamamatsu
On 25 September 2025, Sparx Group, Kansai Electric Power Co., Inc., and JA Mitsui Leasing (Tokyo) announced the development of grid-connected energy storage projects in Mito City, Ibaraki Prefecture and Hamamatsu City, Shizuoka Prefecture. These projects follow the Sapporo City project announced in March.
Plant Details:
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SGET Mito: 50 MW / 175.5 MWh, expected commercial operation June 2029
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SGET Hamamatsu: 30 MW / 110.3 MWh, expected commercial operation June 2028
Investment & Operations:
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Operated by SGET Mito Power Storage Plant LLC and SGET Hamamatsu Power Storage Plant LLC
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Investors: Kansai Electric Power, JA Mitsui Leasing, Sparx Group
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Storage batteries & PCS: supplied by Sunglow (China)
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EPC services: Toshiba Energy Systems & Solutions Corporation (Toshiba ESS)
Management & Operations Support:
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SPARX Green Energy & Technology (SGET) provides development, financing, and operational support, optimizing returns through capacity markets, wholesale electricity trading, and demand-supply balancing.
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Support services include battery operation & diagnostics from Kansai Electric Power, and electricity market operations from E-Flow (Kansai Group) via Kan-denchi, an all-in-one service for energy storage facilities.
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JA Mitsui Leasing provides expertise in project development and finance.
These projects represent a significant step in enhancing grid energy storage capabilities, supporting supply-demand balancing and renewable energy deployment in Japan.
