Eco Friendly
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Exactly why is hydropower an environmentally friendly energy source? It's simply because we could funnel electrical energy by transforming water into electricity.
The use of hydroelectric energy or even hydroelectricity goes back to Ancient Greece as well as China when they set up waterwheels in quickly flowing rivers in order to turn millstones and other equipment. Years later, this was utilized in the New World which is now referred to as North America to power saws along with other equipment.
The Water Wheel
However the actual hydroelectric plants nowadays still make use of the similar fundamental concepts as the historical waterwheel with a few modifications. The main difference is that we use the force from the power in order to push the actual turbine which in turn powers an electrical generator thus producing usable energy.
To ensure that there's a constant flow of energy being produced, a dam needs to be constructed in order to keep the water. When there is a need for more energy, the gates of the dam are opened up so water can be released. During non-peak, the gates are usually closed. To be sure there's water all the time, some dams have a recovery as well as pumping systems to the water released may be used again.
There are issues along with the use of hydroelectricity. Some claim it poses a problem for fish and aquatic plants on each side of the dam. Since the flow of water has been changed, the nutrient rich silt which helps vegetation grow might be affected which is precisely what occurred when the Aswan Dam was finished in Egypt.
However there are ways to fix that and the larger picture is that energy produced from hydroelectric plants don't produce any kind of emissions or waste which actually is far better than operating a coal-fired power plant.
Wave Power
There's another way to generate hydropower and you get this form the sea. This is also referred to as wave power or wave energy which makes use of changes in the air levels of sealed chambers to power turbines. Whenever a wave rises into the chamber, the rise water forces the air out which then becomes an electrical generator.
As soon as the wave goes down, air moves into the turbine and back into the chamber through doors that will close.
These chambers stay afloat on the sea and how much energy it produces differs. Lots of these are used on the western coasts of Scotland, southern Africa, Australia, northern Canada,, and the northwestern coasts of the USA. These devices are usually small and can power a warning buoy or a small light house.
Tidal Energy
Another highlight is tidal energy. The main difference compared to wave energy is when the tide approaches, the water is trapped within reservoirs behind dams. When the tide falls, the water behind the dam is released thus generating energy much like a hydroelectric power plant.
This could only work if you have tides that are a minimum of 16 feet. There are just a few locations on the planet that can do this.
Ocean Thermal Energy
Finally, you have ocean thermal energy. Here, you obtain energy based on the various temperatures in the water. For this to operate, you will need at least 38 degrees Fahrenheit difference between the hotter surface water and the colder deep sea water. Still in the testing phase, it's used in Japan and Hawaii.
Hydropower is really a green power source. It's safe to use and what's even better is that it's renewable.
Terje Brooks has written articles online for many years and likes to write about alternative power sources, but he is also an expert writer in other areas like for example Mitsubishi solar panels. Just take a look at his website containing solar electric panels reviews.
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