Electricity sector in Japan
overview of the electricity sector in Japan
The electric power industry in Japan covers the generation, transmission, distribution, and sale of electric energy in Japan. Japan's electricity demand was approximately 805.9 terawatt-hours (TWh) in 2024. Before the 2011 Fukushima Daiichi nuclear disaster, about a quarter of electricity in the country was generated by nuclear power.
In the following years, most nuclear power plants have been on hold, being replaced mostly by coal and natural gas. Solar power is a growing source of electricity, and Japan has the third largest solar installed capacity with about 50 GW as of 2017. Japan's electricity production is characterized by a diverse energy mix, including nuclear, fossil fuels, renewable energy, and hydroelectric power. Japan has the second largest pumped-hydro storage installed capacity in the world after China.
The electrical grid in Japan is isolated, with no international connections, and consists of four wide area synchronous grids. Unusually, the Eastern and Western grids run at different frequencies (50 and 60 Hz respectively) and are connected by HVDC connections. This considerably limits the amount of electricity that can be transmitted between the north and south of the country.
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