Tidal Energy is a natural source of energy, but it has some prominent following advantages and disadvantages:

Advantages of Tidal Energy:

• Tidal power is free.
• It have no greenhouse gas emissions and no other wastes.
• Don’t need any fuel.
• Reliable electricity production.
• Its maintenance is not highly expensive.
• Tides are always predictable.
• Offshore turbines and vertical-axis turbines are costly but not costly to built, also that it has positive impact on environment.
• Its renewable energy. The tides will continue to ebb and flow, and will produce the power.
• One tidal plant after implementation can produce energy for 75 to 100 years.
• For generating power,  it uses cheapest source as fuel which is water.
• Electricity production is reliable through tidal nergy.
• It protects the coastline against the damage from high storm tides and provides a ready made road bridge.

As long as as moon exists, earth revolves,nothing can stop tidal flows.

Disadvantages

• It causes a constant loss of mechanical energy in the earth-Moon system.
• Energy loss causes the earth to slow in the 4.5 billion years, since formation losing 17% of its rotational energy.
• It may take extra energy from the system which will increase the rate of slowing it over the next millions of years.
• Similar effects are on large dams; it affects the flow of saltwater in and out of estuaries. This will change the hydrology and salinity, and can create negative affects on the marine mammals that use the estuaries as their habitat.
• When smaller volume of water exchanges between the basin and the sea, the turbidity decreases.
• It decreases the salinity inside the basin which also affect on the ecosystem.
• The barrage which is build across an estuary is so much expensive. But that barrage affects a wide area and change the environment for many miles downstream and upstream. Usually it harms the coast birds because they get food from the mud which is uncovered by tides.
• It provides power only for 10 hours a day. And that’s only when the tides are moving in and out.
• Tidal energy only produces 7% of electricity in England. Which means very few population can use this free energy while paying lot of money for other types of electricity.
• The mud flats and destroys the living animals and birds on it.
• As the water can not flow away so all the dirt and pollution ligers around the coast.
• It disrupts the creatures’ migration in the ocean.
• A lot of maintenance is required for barrage systems for their salt resistance parts.
• The people who rely on fishing are affected by it.
• Like other renewable energy and conventional power generation it’s so much expensive.
• Its maintenance is complicated because of sea-basing generation facilities.
• It destroys the ecosystem at the bay.

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