Japan: Hydroelectricity capacity, million kilowatts
For that indicator, The U.S. Energy Information Administration provides data for Japan from 1980 to 2016. The average value for Japan during that period was 21.3 million kilowatts with a minumum of 18.28 million kilowatts in 1980 and a maximum of 22.57 million kilowatts in 2016.
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