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Tidal Wave Energy - Quick Guide to Costs,Investment and How Tidal Generators Produce Ti... - 1 views

www.greenworldinvestor.com/...generators-produce-tidal-power tidal converted
shared by morehousejam98 on 22 Oct 12 - No Cached
  • .In this form of Tidal Power,a Barrage is built near the coast where water is collected during the periods of high tides.During low tide the barrage allows the water from the reservoir to move towards the ocean or sea.The potential energy of the water at a higher level is converted to electricity using Turbines.
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Tidal power (tidal energy) facts - Interesting energy facts - 1 views

interestingenergyfacts.blogspot.com/...-power-tidal-energy-facts.html tidal energy
shared by tavarreskat99 on 22 Oct 12 - Cached
  • Tide mills, in use on the Spanish, French and British coasts, date back to 787 A.D.
  • Tidal energy is a type of energy that produces electricity and other forms of power through the use of water.
  • The tide moves a huge amount of water twice each day and although the tidal energy supply is reliable and plentiful, converting it into useful electrical power is not easy.
  • ...6 more annotations...
  • The first involves converting the power of the horizontal movement of the water into electricity. The second involves producing energy from the rise and drop of water levels
  • Although the technology required to harness tidal energy is well established, tidal power is expensive, and there is only one major tidal generating station in operation. This is a 240 megawatt station at the mouth of the La Rance river estuary in France.
  • There are three prototypes of tidal energy devices: horizontal axis turbine, vertical axis turbine, and oscillating devices
  • Tidal energy is not on the list of sustainable energy technologies the UN agencies even though for islanders it is our best hope for large amounts of affordable clean power.
  • Turbines, similar to wind turbines, can be anchored to the sea bed to generate electricity from tidal currents
  • Tidal energy has an efficiency of 80% in converting the potential energy of the water into electricity
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EERE News: DOE Reports Show Major Potential for Wave and Tidal Energy Production Near U... - 0 views

apps1.eere.energy.gov/...pa_id=664 wave potential
shared by logansar99 on 24 Oct 12 - No Cached
  • The United States uses about 4,000 terawatt hours (TWh) of electricity per year. DOE estimates that the maximum theoretical electric generation that could be produced from waves and tidal currents is approximately 1,420 TWh per year, approximately one-third of the nation's total annual electricity usage.
  • calculate the maximum kinetic energy available from waves and tides off U.S. coasts that could be used for future energy production, and which represent largely untapped opportunities for renewable energy development in the United States.
  • The West Coast, including Alaska and Hawaii, has especially high potential for wave energy development, while significant opportunities for wave energy also exist along the East Coast. Additionally, parts of both the West and East Coasts have strong tides that could be tapped to produce energy.
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Winds, Waves, Tides - Ocean Energy | Environmental News, Articles & Information | Globa... - 2 views

www.ecoworld.com/...-waves-tides-ocean-energy.html cost how what sustainable future
shared by dpurdy on 03 Nov 11 - No Cached
  • Can Already Cost Under $.06 per Kilowatt Hour * Pneumatic devices, such as the oscillating water column (OWC), use wave motion to compress and decompress air, and drive a turbine. * Float-based devices utilise a buoyant float moving with the waves, reacting against a sea bed anchor in order to harness energy. * Spillover devices utilise wave height to replenish a reservoir of seawater, which runs a turbine. * Raft-type devices use the relative motion of adjacent rafts or pontoons to harness wave energy. * Moving-body devices articulate in the water, inducing motion, which may be used to drive a hydraulic motor.
  • Tidal stream devices extract energy from the diurnal flow of tidal currents (caused by the gravitational pull of the moon). Unlike wind and wave power, tidal streams offer entirely predictable output. However, as the lunar cycle is of around 25 hours’ duration, the timing of peak outputs differs by around an hour each day and tidal energy cannot be guaranteed at times of peak demand.
  • However, several large grid-connected demonstration projects are expected to enter the water in the near future. Tidal stream is thus a few years behind wave energy.
  • ...3 more annotations...
  • Marine Current Turbines is about to field test a submerged 300 kW tidal turbine off Devon in the United Kingdom
  • The manufacturers of all these devices expect to deliver energy at a cost of 10-14 US cents per kWh, falling to below 6 US cents as experience grows and technologies mature
  • Power generation using wave energy is at a much earlier stage of development. Wave energy offers more predictable outputs than wind, but in early 2003 there was only around one megawatt of generating capacity installed worldwide, all of it essentially with demonstration prototypes. Proposed projects are likely to take this to about 6 MW over the next few years. The wave industry is characterised by a wide variety of novel devices
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EIA Energy Kids - Hydropower - 1 views

www.eia.gov/...energy.cfm what how location
shared by dpurdy on 03 Nov 11 - No Cached
  • Tides are caused by the gravitational pull of the moon and sun, and the rotation of the Earth. Near shore, water levels can vary up to 40 feet due to Tides. Dam of the Tidal Power Plant on the Estuary of the Rance River, Bretagne, France Source: Stock photography (copyrighted) Tidal power is more predictable than wind energy and solar power. A large enough tidal range — 10 feet — is needed to produce tidal energy economically.
  • The United States has no tidal plants and only a few sites where tidal energy could be produced economically. France, England, Canada, and Russia have much more potential to use this type of energy.
  • Tidal turbines are basically wind turbines in the water that can be located anywhere there is strong tidal flow. Because water is about 800 times denser than air, tidal turbines have to be much sturdier than wind turbines. Tidal turbines are heavier and more expensive to build but capture more energy.
  • ...2 more annotations...
  • Waves are caused by the wind blowing over the surface of the ocean. There is tremendous energy in the ocean waves. It's estimated that the total potential off the coasts of the United States is 252 billion kilowatthours a year, about 6% of the United States' electricity consumption in 2010. The west coasts of the United States and Europe and the coasts of Japan and New Zealand are good sites for harnessing wave energy.
  • Many more ways to capture wave energy are currently under development. Some of these devices being developed are placed underwater, anchored to the ocean floor, while others ride on top of the waves. The world's first commercial wave farm using one such technology opened in 2008 at the Aguçadora Wave Park in Portugal.
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RenewableUK - Where Does Tidal Energy Come From? - 0 views

www.bwea.com/tides.html what Tide
shared by dpurdy on 03 Nov 11 - No Cached
  • Where Does Tidal Energy Come From? The gravitational force of the Earth stops the ocean from floating off into space, just like everything else. The Moon also has a very weak gravitational effect on the Earth, which is not normally noticable as far as falling teacups are concerned, but the ocean, which can flow around the globe to even out differences, is noticably affected.
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History of Tidal Energy in Europe - 0 views

www.tidalenergy.eu/tidal_energy_history.html tide history
shared by levendosjoh99 on 23 Sep 13 - No Cached
  • Europe has a long history of employing tidal forces to generate power, and tide mills dating back to the Middle Ages can be found across the continent. A dam with a sluice was constructed spanning a tidal inlet, or a section of a tidal estuary was turned into a reservoir.
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Tidal Energy Advancing in USA >> Offshore Wind - 1 views

www.offshorewind.biz/...tidal-energy-advancing-in-usa usa tide current
shared by mannixjul00 on 23 Sep 13 - No Cached
  • Verdant Power founders are planning to install up to 30 turbines with the total capacity of 1MW in the East Channel of the East River, writes The Day news portal.
  • Verdant Power is among the first companies that are exploring the potential of the tidal energy. Unlike the wind and solar power, tidal power is predictable as the tides move in correlation with the movement of the moon
  • The initial costs for the development of this technology are high. The company has raised USD 35 million so far and needs USD 25 million more.
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My Library - 2 views

www.diigo.com/warneraus98 tide sustainable
shared by warneraus98 on 13 Mar 13 - No Cached
  • 90800Tidal energy
  • warneraus98 on 13 Mar 13
     
    power
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peak_flow_spring.png (1170×907) - 0 views

www.engineering.lancs.ac.uk/...peak_flow_spring.png tide picture
shared by warneraus98 on 12 Mar 13 - No Cached
  • warneraus98 on 12 Mar 13
     
    renewable
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Project Objectives - 0 views

www.tidalstreampower.gatech.edu/Project.htm tide history
shared by lemairenat98 on 12 Mar 13 - No Cached
  • In 2005, EPRI was first to study representative sites (Knik Arm, AK; Tacoma Narrows, WA; Golden Gate, CA; Muskeget Channel, MA; Western Passage, ME) without mapping the resources [1].
  • lemairenat98 on 12 Mar 13
     
    " In 2005, EPRI was first to study representative sites (Knik Arm, AK; Tacoma Narrows, WA; Golden Gate, CA; Muskeget Channel, MA; Western Passage, ME) without mapping the resources [1]. "
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Tidal energy extraction: renewabl... preview & related info | Mendeley - 0 views

www.mendeley.com/...ewable-sustainable-predictable cost tide sustainable
shared by sconzomic99 on 12 Mar 13 - No Cached
  • The tidal flow of sea water induced by planetary motion is a potential source of energy if suitable systems can be designed and operated in a cost-effective manner
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Tidal Energy | Renewable Energy Development - 0 views

renewableenergydev.com/tidal-energy cost tide
shared by murphymat98 on 12 Mar 13 - No Cached
  • The cost of setting up a tidal power station can be very high, although once in place the operating costs are low. As an example of the cost of setting up, a proposed 8000 MW tidal power plant and barrage system on the Severn Estuary in the UK has been estimated to cost US$15 billion, while another in the San Bernadino strait which would produce 2,200 MW as a tidal fence in the Philippines will cost an estimated US$3 billion.
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ScienceDirect.com - Renewable Energy - Initial evaluation of tidal stream energy resour... - 0 views

www.sciencedirect.com/...S0960148105002193 tide current
shared by lemairenat98 on 12 Mar 13 - No Cached
  • Portland Bill (Dorset, UK) is a promising site for tidal stream energy exploitation; it combines high tidal stream velocities around the headland with a location closer to population centres than other proposed sites.
  • lemairenat98 on 12 Mar 13
     
    "Portland Bill (Dorset, UK) is a promising site for tidal stream energy exploitation; it combines high tidal stream velocities around the headland with a location closer to population centres than other proposed sites."
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Marine energy - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Ocean_energy tide convert
shared by warneraus98 on 12 Mar 13 - No Cached
  • Theoretical global ocean energy resource[2] Capacity (GW) Annual gen. (TW·h) Form 5,000 50,000 Marine current power[3] 20 2,000 Osmotic power 1,000 10,000 Ocean thermal energy 90 800 Tidal energy 1,000—9,000 8,000—80,000 Wave energy
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tidal energy - 0 views

www.odec.ca/...tidal.html tide energy cost
shared by tavarreskat99 on 12 Mar 13 - No Cached
  • Tidal energy is the utilization of the variations in sea level caused primarily by the gravitational effects of the moon, combined with the rotation of the Earth.
  • Tidal energy is a clean, renewable energy resource, but its environmental impacts and accessibility, limit its potential to become a major provider of electricity. Where tidal energy is a viable resource, it may prove to be expensive at first, but economical in the long run if the technology improves.
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How Tidal Power is Riding the Crest of a Wave - 1 views

www.renewableenergyworld.com/...-is-riding-the-crest-of-a-wave tide wave
shared by crandallmad00 on 12 Mar 13 - No Cached
  • The argument for tidal power is overwhelming: it’s a practically infinite supply of clean energy and has one of the smallest carbon footprints of any power source; it’s reliable, cost-efficient, has minimal effect on the marine environment and virtually zero effect on sea-gazing aesthetics. Most importantly, The World Energy Council estimates that the energy that can be harvested from world’s oceans is equal to twice the electricity that the world produces now
  • A reason many energy experts are looking at what tidal may be able to contribute, compared to other renewable sources like wind power, is that the amount of energy generated from a power-generating turbine is proportional to the density of the fluid that flows back and forth – meaning a water turbine has several hundred times the power of an air turbine.
  • Seawater is denser than air; a lot denser – 832 times to be exact, meaning an 8 knot tidal current has more energy than a 380kph wind. This means a wave farm of ‘sea snakes’ – devices built by Scotland’s Pelamis Wave Power – covering half a square mile of ocean could produce 30 MWh of power, which is estimated to be enough for 20,000 homes. A wave farm covering 472 square miles could supply 24 million households – enough for the entire UK.
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  • Partly this has been due to the uncertainty of how to harness all this abundant marine energy. While it’s great that there’s the potential to harness up to 153 GW of tidal power in the UK alone,
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Mapping US Tidal Power Potential | Climate Central - 0 views

www.climatecentral.org/...pping-us-tidal-power-potential tide energy current
shared by Xin Wang on 12 Mar 13 - No Cached
  • It’s estimated that tidal power in Alaska could generate as much as 16 TWh/yr of energy (about four times more than what Hoover Dam generates in an average year). In the Lower 48, the potential energy from tidal power is just a fraction of that (just 0.6 TWh/year from Puget Sound, for example). Considering that no tidal power plants in these areas have even been approved yet, it’s going to be several years, or even decades, before Americans can rely on tidal power for their electricity. But for some regions, DOE says the energy from tidal currents will help meet the goal of generating 80 percent of America's electricity from clean sources by 2035.
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Global Pollution and Prevention News: Tidal Power - 0 views

www.enn.com/...42118 tide pollution
shared by murphymat98 on 12 Mar 13 - No Cached
  • One area of concern is how underwater noise generated by the turbines could affect marine mammals that use auditory cues to navigate and communicate with each other.
  • murphymat98 on 12 Mar 13
     
    noise
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