01/31/2014 - 23:14
Renewable Energy Development Institute - REDI

High and low tides can be used to generate large amounts of energy. Therefore hydroelectric power plants are built e.g. in deltas and river mouths by the sea. They produce energy, because flowing water sets in motion the turbines connected to some electricity generators. Another way of using water tides is placing turbines in the bottom of the sea, so they can work regardless of the water current's direction. The Norwegians applied this method when they installed the turbines in the bottom of the North Sea, deep enough not to interfere with sailing.

Almost all of the European countries could produce energy from virtually any inland bodies of water, from creeks to reservoirs and lakes. Run-of-the-water hydroelectricity power stations use streams and rivers for generation of power. Although on larger rivers the power plants can be erected directly on the water current, it substantialy modifies the water flow. Therefore the turbines are usually turned only part of the water from the river, collected by the penstock pipes. Pumped-storage plants, situated between two bodies of water, also enable generation of power. Water from the higher elevation (the higher situated body of water) is released through turbines, which are connected to an electricity generator, to the lower elevation. When demand for energy decreases (e.g. in the night time), water is pumped from a lower elevation reservoir to a higher elevation, using excess energy produced earlier.

The advantages of the hydroelectric power plants: no pollution released to the enviroment, prevention against out-of-control water flow, economy of fuel usage and high energy conversion efficiency. Even though they are quite expensive when it comes to constructing and equipping them, and they work accordingly to the relief and water resources, in comparison with conventional thermal power stations the cost of generation of power in hydroelectric plants is considerably lower.




People are forever trying to find new sources of renewable energy, so it isn’t surprising that they are especially interested in water and its versatility. Accordingly, much effort has been directed into obtaining energy from tidal and wave power, which are defined as circular movements of water molecules caused by wind that moves water surface through friction.