Hydroelectric power , often called hydropower, is considered a renewable energy source. A renewable energy source is one that is not depleted in the production of energy. Through hydropower, the energy in falling water is converted into electricity without “using up” the water.
Humans first learned to harness the kinetic energy in water by using waterwheels. A waterwheel is a revolving wheel fitted with blades, buckets, or vanes. Waterwheels convert the kinetic energy of flowing water to mechanical energy.
Early waterwheels used mechanical energy to grind grains and to drive machinery such as sawmills and blacksmith equipment.
In Roumania is used Watermill. One of the most important is Cheile Rudăriei Watermill. It is located in Almăjului Mountain.
PORTILE DE FIER I The most important hydropower from Roumania built on Danube is Portile de Fier I and II. Is located 15 kilometers from Drobeta Turnu Severin.
PORTILE DE FIER II The capacity of hydropower is 1080 MW. Both are exploited from Roumanian and Serbian.