How Tidal Energy Is Generated
There are four methods of producing tidal energy. The tidal barrage is a typical dam. It is built across a river or other waterway with tunnels built the width of the dam. When the tide changes, the raising or lowing of the water running through a turbine generates power. Tidal fences are enormous barriers, and water passing through the barrier generates power. The most recent development in water power technology is the tidal turbine. This turbine resembles an underwater wind turbine, built under water to harness tidal flow. The current methods for trapping tidal energy are more sophisticated versions of the original tide mills, which were used on the British, French and Spanish coasts.
Cost
The low cost of capturing energy and producing electricity is the primary purpose of tidal energy. Although the power generated by high and low tides is free, the turbines and generators necessary to convert the raw power into usable energy can be expensive to build. Once the physical plants are built, the maintenance of those facilities may be relatively inexpensive, compared to the energy generated.
Consistency
Another reason to use tidal power is consistency. Tides are anticipated. The tidal power source is renewable; there is no adverse impact on the environment and no greenhouse gases. The quality and quantity of electricity is not subject to raw material source quality fluctuations, as is petroleum, natural gas and coal.
Subjective Considerations
Dams, generators and turbines will not have a negative impact on someone enjoying a view of nature. Much of this equipment is underwater and could even possibly double as a reef environment. The power plants will not cause noxious fumes or dump any waste into the water. It is a extremely clean source of energy.