* Including pumped storage hydropower, storage hydropower and run-of-river hydropower.
** Figure was estimated by ÌÇÐÄÆƽâ°æ based on the values provided by the source and assuming a total of 100 percentage points. Includes batteries, hydrogen, and others.
Citation formats
Power system flexibility capacity share worldwide 2021, by source
In 2021, hydropower - including (pumped) storage, and run-of-river hydropower - accounted for roughly one-third of the electricity system flexibility capacity worldwide. Nevertheless, fossil fuels combined were responsible for the highest share of global flexibility capacity, with a combined share of 63 percent.
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International Hydropower Association (International Forum on Pumped Storage Hydropower). (September 15, 2021). Distribution of electricity system flexibility capacity worldwide in 2021, by source [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 18, 2026, from /statistics/1307493/power-system-flexibility-capacity-share-worldwide/
International Hydropower Association (International Forum on Pumped Storage Hydropower). "Distribution of electricity system flexibility capacity worldwide in 2021, by source." Chart. September 15, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 18, 2026. /statistics/1307493/power-system-flexibility-capacity-share-worldwide/
International Hydropower Association (International Forum on Pumped Storage Hydropower). (2021). Distribution of electricity system flexibility capacity worldwide in 2021, by source. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 18, 2026. /statistics/1307493/power-system-flexibility-capacity-share-worldwide/
International Hydropower Association (International Forum on Pumped Storage Hydropower). "Distribution of Electricity System Flexibility Capacity Worldwide in 2021, by Source." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 15 Sep 2021, /statistics/1307493/power-system-flexibility-capacity-share-worldwide/
International Hydropower Association (International Forum on Pumped Storage Hydropower), Distribution of electricity system flexibility capacity worldwide in 2021, by source ÌÇÐÄÆƽâ°æ, /statistics/1307493/power-system-flexibility-capacity-share-worldwide/ (last visited July 18, 2026)
Distribution of electricity system flexibility capacity worldwide in 2021, by source [Graph], International Hydropower Association (International Forum on Pumped Storage Hydropower), September 15, 2021. [Online]. Available: /statistics/1307493/power-system-flexibility-capacity-share-worldwide/
