"Already developed" includes power plants that have been in operation as of March 31, 2021, and that have a maximum output of 100 kilowatt or more.
"Under construction" is calculated based on the Electricity Business Act for which the preliminary notification of the construction plan was received by March 31, 2021.
Figures have been rounded.
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Maximum output of hydropower plants Japan 2021, by status of the plant
In Japan, the maximum output of pumped storage hydropower systems that were already fully developed amounted to over **** million kilowatt in 2021. The maximum output of pumped storage hydropower systems was much higher than for conventional hydropower.
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METI (Japan). (April 11, 2022). Maximum output of hydropower stations in Japan in 2021, by status of the plant (in million kilowatt) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 30, 2026, from /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/
METI (Japan). "Maximum output of hydropower stations in Japan in 2021, by status of the plant (in million kilowatt)." Chart. April 11, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 30, 2026. /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/
METI (Japan). (2022). Maximum output of hydropower stations in Japan in 2021, by status of the plant (in million kilowatt). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 30, 2026. /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/
METI (Japan). "Maximum Output of Hydropower Stations in Japan in 2021, by Status of The Plant (in Million Kilowatt)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 11 Apr 2022, /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/
METI (Japan), Maximum output of hydropower stations in Japan in 2021, by status of the plant (in million kilowatt) ÌÇÐÄÆƽâ°æ, /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/ (last visited July 30, 2026)
Maximum output of hydropower stations in Japan in 2021, by status of the plant (in million kilowatt) [Graph], METI (Japan), April 11, 2022. [Online]. Available: /statistics/1283436/japan-maximum-output-hydropower-station-by-status-of-plant/
