TIDAL ENERGY | The Renewable Energy.

“Tidal energy is a form of hydropower that converts the energy of the tides into electricity or other useful forms of power. The tide is created by the gravitational effect of the sun and the moon on the earth causing cyclical movement of the seas.”

How tidal energy is harnessed?
Tidal energy is produced through the use of tidal energy generators. These large underwater turbines are placed in areas with high tidal movements and are designed to capture the kinetic motion of the ebbing and surging of ocean tides in order to produce electricity.
TIDAL RANGE:-
Tidal Range is the vertical difference in height between the high tide and the succeeding low tide.Artificial tidal barrages or lagoons may be constructed to capture the tide. Turbines in the barrier or lagoon generate electricity as the tide floods into the reservoir; water thus retained can then be released through turbines, again generating electricity once the tide outside the barrier has receded.
TIDAL ENERGY GENERATORS:-
There are currently three different ways to get tidal energy namely:-TIDAL STREAMS, BARRAGES, and TIDAL LAGOONS.
TIDAL STREAM:-
Tidal Stream is the flow of water as the tide ebbs and floods and manifests itself as tidal current. Tidal Stream devices seek to extract energy from this kinetic movement of water, much as wind turbines extract energy from the movement of air.
BARRAGE:
Another type of tidal energy generator uses a large dam called a barrage. With a barrage, water can spill over the top or through turbines in the dam because the dam is low. Barrages can be constructed across tidal rivers, bays, and estuaries. 
Turbines inside the barrage harness the power of tides the same way a river dam harnesses the power of a river. The barrage gates are open as the tide rises. At high tide, the barrage gates close, creating a pool, or tidal lagoon. The water is then released through the barrage’s turbines, creating energy at a rate that can be controlled by engineers.
A barrage is a much more expensive tidal energy generator than a single turbine. Although there are no fuel costs, barrages involve more construction and more machines. Unlike single turbines, barrages also require constant supervision to adjust power output.
Important Facts About Tidal Energy:-
1- Tidal energy is the oldest form of energy, dating back to around 800 A.D.
2- It was originally used to harvest and smash grains.
3- The tidal movement of the ocean occurs twice a day, in the evening and morning, every single day.
4- The cost of building a tidal energy plant is between 100 and 200 million dollars, depending on the power limits.
ADVANTAGES of Tidal Energy:-
1-It is an inexhaustible source of energy.
2-Tidal energy is environment-friendly energy
and doesn’t produce greenhouse gases.
3-As 71% of Earth’s surface is covered by water, there is scope to generate this energy on large scale.
4-We can predict the rise and fall of tides as they follow cyclic fashion.
5-Efficiency of tidal power is far greater as compared to coal, solar or wind energy. Its efficiency is around 80%.
 6- Although cost of construction of tidal power is high but maintenance costs are relatively low.
7-Tidal Energy doesn’t require any kind of fuel to run.
8-The life of tidal energy power plant is very long.
DISADVANTAGES of Tidal Energy:-
1-Cost of construction of tidal power plant is high.
2-There are very few ideal locations for construction of the plant and they too are localised to coastal regions only.
3-Intensity of sea waves is unpredictable and there can be damage to power generation units.
4-Influences aquatic life adversely and can  disrupt migration of fish.
5- The actual generation is for a short period of time. The tides only happen twice a day so electricity can be produced only for that time.
6-Frozen sea, low or weak tides, straight shorelines, low tidal rise or fall are some of the obstructions.
7-This technology is still not cost effective and  more technological advancements are required to make it commercially viable.
               
“Tidal Energy is thus a clean source of energy and doesn’t require many land or other resources as in harnessing energy from other sources. However, the energy generated is not much as high and low tides occur only twice a day and continuous energy production is not possible.”

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