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Hydroelectric power plants use the potential energy, the difference in the level of water before and after the energy recovery. River power plants avail huge water amounts, whereas reservoir power plants profit from the difference in level.
Big hydroelectric power plants (at rivers like the river Danube) tap already the full potential of this capability in Austria and account for 60 per cent of the Austrian power generation.
Primarily, additional capabilities exist in smaller hydroelectric power plants (up to 10 MW electrical output), which account currently for another 10 per cent.
Reservoir power plants in the Alps deliver valuable surge current and illustrate an immediate available power reserve for a power bottle-neck.
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