Oceans tidal power

Tidal Power. Tidal power is caused by the gravitational pull of the sun and especially the moon, as they pull at the earth. Reacting to this pull, the ocean s waters rise, causing a high tide where the moon is closest. The difference between low and high tide can range from a few cm to several meters. Harnessing tidal power for electricity production by the use of dams requires a tidal difference of at least 4.5 m, a requirement met at few locations in the United States. Thus, the principal demonstration sites of tidal power are in Canada, China, and France. 

Wave power, tidal power, municipal solid waste, gas from animal wastes (biogas), landfill, peat energy and ocean thermal energy conversion (OTEC) are the other renewable energy sources (RES). Water energy sources are hydropower, tidal and wave technologies. 

Tidal Power - The power available from the rise and fall of ocean tides. A tidal power plant works on the principal of a dam or barrage that captures water in a basin at the peak of a tidal flow, then directs the water through a hydroelectric turbine as the tide ebbs. 

Energy Efficiency Comparisons Between Countries Energy Flows in Ecology and in the Economy Fossil Fuel Power Stations Hydroelectric Power Stations Nuclear Power Reactors Ocean Thermal Energy Conversion Petroleum Geology Renewable Energy from Biomass Solar Thermal Power Stations Tidal Power Sys-... 

The energy that powers terrestrial processes is derived primarily from the sun and from the Earth s internal heat production (mostly radioactive decay). Solar energy drives atmospheric motions, ocean circulation (tidal energy is minor), the hydrologic cycle, and photosynthesis. The Earth s internal heat drives convection that is largely manifested at the Earth s surface by the characteristic deformation and volcanism associated with plate tectonics, and by the hotspot volcanism associated with rising plumes of especially hot mantle material. 

All these circumstances have lead the industry to begin searching for a new source of energy an alternative and completely petroleum-independent power source. Several technologies are being researched, such as biomass (bio-diesel, ethanol), renewable ocean sources (wave, tidal, and thermal), hydrogen, and many more. 

See also Climatology Coastal Engineering Fisheries Science Flood-Control Technology Hydroelectric Power Plants Meteorology Ocean and Tidal Energy Technologies Oceanography Water-Pollution Control Water Supply Systems. 

Every continent on the planet is surrounded by a cleaner, safer, more efficient energy resource. As conventional energy supplies are depleted, means are being developed, and in some cases are in actual operation, to convert the energy found in waves, tidal currents, ocean and river currents, ocean thermal gradients, and offshore wind into usable electric power for utility-scale grids, independent power producers, and the public sector. 

Power from Currents. Besides the proposed giant rotors in the Gulf Stream, which would be an open-ocean device, a number of projects have been designed for obtaining power from tidal currents in estuaries and other constricted passives using... 

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