In Ghana, between 1970 and 1990, rainfall variability accounted for 21% of interannual variations in hydropower generation . In Brazil's São Francisco River, following drought events in 2016 and 2017, hydropower plants operated with an average capacity factor of only 23% and 17%, respectively . In Switzerland, increased glacier melt contributed to 3-4% of hydropower production since 1980  . In the USA, hydropower generation dropped by nearly 27% for every standard deviation increase in water scarcity. Equivalent social costs of loss in
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report