Linked from
The 26 pages that link to Hydropower, each with the reason it gives.
GlacierRelated: Seasonal glacier melt can contribute to river flows used for power generation.
AlpsRelated: Alpine rivers and reservoirs provide substantial hydropower resources.
River dischargeRelated: River discharge helps determine the water available to drive turbines.
River engineeringRelated: Dams and diversion works make river flow available for power generation.
StreamflowRelated: The amount and timing of streamflow constrain hydropower generation.
VøringsfossenRelated: Water use in the Bjoreio catchment affects flow in the waterfall.