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  Reservoirs
can be used to store water to feed hydroelectric power stations.
Hydroelectric power is generated by using the energy from
falling water to drive water
turbines that in turn drive electric
generators. The reservoir water is stored at a higher
level than the turbines, which are housed in a power station.
Sometimes, the power station is directly in front of a dam,
and pipes through the dam feed water directly to the turbines.
In other cases, the power station is some distance downhill
from the reservoir, and the water is fed to it through long
pipes or tunnels called penstocks.
Find
out about visiting the Dinorwig and Ffestiniog Power Stations
in North Wales.
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