Tidal Energy power plants are definitely some kind of an exotic form for energy production. That’s because most tidal power plants are just pilot projects that are only build for research purposes and do not create a very big amount of energy in their lifetime. Tidal energy is one form of hydropower energy that gets obtained from tides and is then converted in useful electricity. In ancient times and in the middle ages tide mills have been used to mill grain, and nowadays axial or cross flow turbines are used to produce the electrical energy that is needed in modern times. As the gravitational attraction of the moon moves huge amounts of ocean water on certain coastlines or trough lagoons, tidal power plants were build in this strategic positions, there are 4 main types of tidal power generators: Tidal stream generators, tidal barrages, dynamic tidal power and a tidal lagoon.
Unfortunately the issues that come with tidal energy are fairly big, from environmental concerns on marine life (also given the danger of blade strikes and the acoustic output). From a technical and maintenance point of view corrosion in salt water and fouling have a big impact on the plants and make them hardly economically efficient.
Even tough there are some massive problems to face when it comes to significant tidal power generation, there are some steps in the right direction, like a 3,4 MW tidal power generator in the East China Sea.
Check out tidalenergytoday.com for more news on the argument!