The hydro energy – or the energy of water – is produced of a water stream when spinning a wheel or another device. It is a renewable nature resource, because of the periodicity of the water cycle.

Има много видове турбини изпозвани за хидроенергия и те се избират в зависимост от приложението им и от височината на запряната вода

Nowadays about one fifth of the electricity worldwide is produced on the basis of hydrodynamic energy.

Running water creates energy which can be captured and turned into electricity. That is called hydro energy. The most often met hydro energy plants use a dam built on a river to keep the water in a reservoir. The water released from the reservoir flows through a turbine which rotates, which on its part activates the generator that produces electricity. But the hydro energy does not always need a big dam. Some hydro energy plants just use a small canal to canalize the water from the rivers through the turbines.