In the lecture the professor said that hydropower has both faces. One is advantantage and the other is disadvantage.
Advantage of hydropower is clean ,green and ecofriendly. Hydropower is very convenient because it can respond quickly to fluctuations in demand. The production of hydroelectricity is increased on hot summer afternoons when power is needed for air conditioners and decreased at night when prople use less energy. The reservior of water behind th dam is stored energy that can support fisheries and provide various forms of water-based recreation, as for local residents and tourists. Because the reservoirs are used to save water in allowed space. Those are used by fisheries or organism which live in water.
On the otherhand there are some disadvantages. The organisms in a dam or a reservoirs might be die bacause the water in the dam couldn't be rotate with another water. Then the water turns dirty and the nutritions will reduce by organisms. As a result, The water need to be change into fresh water. However, the dam interrupting the water rotation. That is why the water can not be change.
Nevertheless, Hydroelectric power is also very efficient and relatively inexpensive. The earth's water cycle naturally replenishes the supply of "fuel" water. Wherever enough rain falls, there will be rivers. If a paricular section of river has the right terrain to form a reservoir, it may be suitable for dam construction. Modern hydroelectric turbines can convert as much as 90percent of the available energy into electricity. In contrast, the best fossil-fuel plants are only about 50 percent efficiont.
Finally, the Hydroelectric power has two faces. Then, we must use good faces of Hydroelectric power. |