A total of 15 projects with a combined capacity of 187.8MW/758.9MWh was awarded 13.38 billion yen under the Tokyo Metropolitan Government’s program for supporting grid-scale battery storage development in the Tokyo TSO area, the subsidy’s operator Tokyo Environmental Public Service Corporation announced on January 20, 2026.
According to the statement, the awarded amounts ranged between about 230 million yen and the 2 billion yen cap. The subsidy covers up to two-thirds (three-quarters if using recycled EV batteries) of eligible development and construction costs.
When it opened the program for applications, the government planned to support six high-voltage (sub-2MW) and five extra high-voltage (2MW+) facilities with a total of 13 billion yen. The results suggest eight high-voltage (about 300 million yen or less per awarded project) and seven extra high-voltage (about 850 million yen or more) projects have been selected.
Four projects in the Tokyo Metropolis, including two high- and two extra high-voltage, were awarded, compared to only one across the first two rounds. The remaining awards were split across Gunma (4), Saitama (3), Chiba (2), Tochigi (1), and Shizuoka (1). No project in Kanagawa Prefecture was selected this year. FY2025, however, was the first year for a project in Shizuoka Prefecture, which only partially sits within the Tokyo TSO area, to be awarded.
Mizuho-Toshiba Leasing, Noval Solar, and Tama Business Enterprise secured support for two projects each. The majority of applicants appear to have co-applied with their selected aggregator, with, among others, Kansai Electric Power’s E-Flow being part of three projects, and Digital Grid and Mitsubishi Corporation’s ElectroRoute Japan two each.
The total awarded capacity under the subsidy scheme’s FY2025 budget topped the two previous rounds. In the program’s inaugural year, FY2023, 50.5MW/171.6MWh was awarded across 26 projects. In FY2024, 12 projects totaling 180MW/595.3MWh were selected.
Recipients of Tokyo Metropolitan Government’s FY2025 Subsidy for Grid-Scale BESS Projects
- Gunma
- Nippon Chikudenchi Co., Ltd. with Digital Grid Co., Ltd. (230,582,000 yen)
- Mercury LLC with Ricoh Lease Co., Ltd., Olympia Co., Ltd., and E-Flow LLC (243,408,000 yen)
- Noval Solar LLC with ElectroRoute Japan Co., Ltd. (1,001,487,000 yen)
- Tokyu Construction Co., Ltd. with E-Flow LLC (1,965,903,000 yen)
- Tochigi
- Hulic Co., Ltd. with ElectroRoute Japan Co., Ltd. (2,000,000,000 yen)
- Chiba
- Mizuho-Toshiba Leasing Company with Nippon Rietec Co., Ltd. and Eneres Co., Ltd. (241,493,000 yen)
- Mizuho-Toshiba Leasing Company with Nippon Rietec Co., Ltd. and Digital Grid Co., Ltd.(242,875,000 yen)
- Saitama
- Kyowa Holdings Co., Ltd. with Digital Grid Co., Ltd. (265,619,000 yen)
- Tokyu Corporation with Tokyu Power Supply Co., Ltd. (266,263,000 yen)
- Noval Solar LLC with E-Flow LLC (1,885,158,000 yen)
- Tokyo
- Tama Business Enterprise Co., Ltd. with Nippon Steel Engineering Co., Ltd. (294,400,000 yen)
- Tama Business Enterprise Co., Ltd. with Nippon Steel Engineering Co., Ltd. (300,600,000 yen)
- CD Energy Direct Co., Ltd. with MC Retail Energy Co., Ltd. (850,857,000 yen)
- CS Tokyo Imai ESS 1 LLC with Toshiba Energy Systems & Solutions Corporation (2,000,000,000 yen)
- Shizuoka
- GI Energy Storage No. 1 LLC with Itochu Corporation (1,590,413,000 yen)
