Updated September 11, 2025, 11:10 am.: This article has been updated to include battery system supplier and EPC contractor information released on the same day.
NTT Anode Energy broke ground on its first extra high-voltage grid-scale battery storage project, the 18.2MW/76.8MWh Hokkaido Tomakomai Power Storage Station, in August 2025, the company said on September 1, 2025. It also commissioned its seventh high-voltage facility, the 2MW/8MWh Ishikawa Tsubata Power Storage Station, on the same day.
According to the statement, the facility in Tomakomai City, Hokkaido, is expected to be commissioned in FY2028. The project won an approximately 1.9 billion yen subsidy in METI’s FY2024 program for grid-scale BESS installation. Once operational, the asset will be aggregated by NTT Anode Energy and participate in the wholesale, balancing, and capacity markets.
Hokkaido Tomakomai Power Storage Station will use 27 PowerX Mega Power 2700A units. Kandenko will handle engineering, procurement, and construction (EPC).
Ishikawa Tsubata Power Storage Station will also be aggregated in-house. It follows four projects totaling 7.1MW/33.5MWh brought online earlier in 2025 and two joint projects, including the 1.4MW/4.2MWh Tagawa Power Storage Station in Fukuoka Prefecture developed with Kyushu Electric Power and Mitsubishi Corporation and the 2MW/9.3MWh Tsumagoi Power Storage Station developed jointly with TEPCO.
NTT Anode Energy has 14 additional high-voltage projects across all nine mainland TSO areas in the pipeline, including four scheduled to be begin operations within FY2025 and 10 during the next fiscal year. It is also developing another METI-subsidized extra high-voltage project in Tochigi Prefecture, which it plans to commission in FY2028.
The company said it plans to expand its battery business from its current focus on fully merchant projects to other models, including providing balancing power to retailers and time-shifting renewable generation to enable 24/7 carbon-free power.
