Tohoku-Electric Power Co Inc announced Feb 20, 2015, that it has started commercial operation of a large-size storage batter system installed at Nishi-Sendai Transformer Station in Akiu-machi, Taihaku-ku, Sendai City, Miyagi Prefecture, Japan.

It is a lithium-ion (Li-ion) rechargeable battery system with a capacity of 20,000kWh and output of 20,000kW (40,000kW for a short period of time). It was introduced as a countermeasure against frequency fluctuation caused by the introduction of solar power generation facilities, etc, and Tohoku-Electric Power will check its effects.

The project was selected as the "Urgent Verification Project for Large-scale Storage Battery System in Fiscal 2012," for which New Energy Promotion Council (general incorporated association) called for proposals from the public. And Tohoku-Electric Power has been installing the system since November 2013.

Lithium-ion Battery