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Topic: Tidal energy

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	Encyclopedia: Tidal energy (Site not responding. Last check: 2007-10-11)
		Tidal power is a means of electricity generation achieved by capturing the energy contained in moving water mass due to tides.
		Tidal power is classified as a renewable energy source, because tides are caused by the orbital mechanics of the solar system and are considered inexhaustible within a human timeframe.
		The potential energy contained in a volume of water is E = xMg Where x is the height of the tide, M is the mass of water and g is earth's gravitational force.
	www.nationmaster.com /encyclopedia/Tidal-energy (2898 words)

	Energy development - Wikipedia, the free encyclopedia
		Energy sources are substances or processes with concentrations of energy at a high enough potential to be feasibly encouraged to convert to lower energy forms under human control for human benefit.
		Fossil fuels, in terms of energy, involve the burning of coal or hydrocarbon fuels, which are the remains of the decomposition of plants and animals.
		Tidal energy is renewable, because nothing is consumed in the rising of tides.
	en.wikipedia.org /wiki/Energy_development (3926 words)

	POEMS- FAQ- Tidal Energy Power: Practical Ocean Energy Management Systems, Inc. (Site not responding. Last check: 2007-10-11)
		Tidal energy is one of the oldest forms of energy used by humans.
		Tidal energy is a renewable source of electricity which does not result in the emission of gases responsible for global warming or acid rain associated with fossil fuel generated electricity.
		Tidal power is a form of low-head hydroelectricity and uses familiar low-head hydroelectric generating equipment, such as has been in use for more than 120 years.
	www.poemsinc.org /FAQtidal.html (1558 words)

	Tidal Energy
		Tidal Energy is a largely untapped, renewable ENERGY source based on lunar gravitation rather than solar radiation.
		Unlike the energy from river dams, the daily, monthly and annual availability of tidal energy is fully predictable, but it must be either stored or integrated with other sources of generation that can be adjusted to accommodate the fluctuations of tidal generation.
		Tidal mills were built in Britain, France and Spain as early as the 12th century.
	www.thecanadianencyclopedia.com /index.cfm?PgNm=TCE&TCE_Version=A&ArticleId=A0008003&MenuClosed=0 (448 words)

	Tidal Energy - Introduction (Site not responding. Last check: 2007-10-11)
		Tidal energy exploits the natural rise and fall of coastal tidal waters caused principally by the interaction of the gravitational fields of the Sun and the Moon.
		In future schemes the energy yield would be enhanced by pumping water into the estuary on the flood tide ('flood pumping'), thereby increasing the volume of water released through the turbines on the ebb tide.
		A variant is tidal stream (or marine current) technology, which aims to exploit the strong tidal currents which are found in shallow seas, particularly where natural constrictions exist, such as around headlands or between islands.
	europa.eu.int /comm/energy_transport/atlas/htmlu/tidalintro.html (476 words)

	Renewingindia.org: Tidal Energy (Site not responding. Last check: 2007-10-11)
		Tidal electricity generation involves the construction of a barrage across an estuary to block the incoming and outgoing tide.
		Tidal power utilises the twice daily variation in sea level caused primarily by the gravitational effect of the Moon and, to a lesser extent the Sun on the world's oceans.
		Tidal power is not a new concept and has been used since at least the 11th Century in Britain and France for the milling of grains.
	www.renewingindia.org /tid.html (396 words)

	WEC Survey of Energy Resources 2001 - Tidal Energy
		Tidal energy potential is particularly prevalent along the north-western coast of Australia, where tidal ranges are amongst the largest in the world.
		The development of tidal energy is disadvantaged, however, by the small range of neap tides, which is too low for power generation, and the impracticality of absorbing large amounts of intermittent power in a remote region without installing costly transmission links.
		The tidal ranges of the Gulf of Kutch and the Gulf of Khambat are 5 m and 7 m respectively, the theoretical capacities 900 MW and 7 000 MW respectively and the estimated annual output approximately 1.6 TWh and 15.0 TWh respectively.
	www.worldenergy.org /wec-geis/publications/reports/ser/tide/tide.asp (4287 words)

	Tidal energy
		Tidal energy is a type of renewable energy, a concept that is growing in popularity.
		Even though tidal energy is beneficial to the economy and the environment, the power provided would be on a small scale.
		The positive points of tidal energy use is that it will never run out, is inexpensive, and is not pollution producing like that of fossil fuels.
	riri.essortment.com /tidalenergy_rdrx.htm (716 words)

	EERE: Ocean Energy - Tidal Energy (Site not responding. Last check: 2007-10-11)
		Tidal energy traditionally involves erecting a dam across the opening to a tidal basin.
		The energy potential of tidal basins is large — the largest facility, the La Rance station in France, generates 240 megawatts of power.
		Tidal energy systems can have environmental impacts on tidal basins because of reduced tidal flow and silt buildup.
	www.eere.energy.gov /RE/ocean_tidal.html (112 words)

	Tidal power -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-11)
		Tidal power is a means of (additional info and facts about electricity generation) electricity generation achieved by capturing the energy contained in moving water mass due to tides.
		Tidal power has great potential for future (Possession of controlling influence) power and (additional info and facts about electricity generation) electricity generation because of the total amount of energy contained in this rotation.
		Tidal power is reliably predictable (unlike (additional info and facts about wind energy) wind energy and (Energy from the sun that is converted into thermal or electrical energy) solar power).
	www.absoluteastronomy.com /encyclopedia/t/ti/tidal_power.htm (2341 words)

	Tidal Energy -
		The principle of harnessing the energy of tides dates back to as early as the Middle Ages, when the phenomenon of tides was not yet explained and were used to turn waterwheels, producing mechanical power.
		A large amount of energy is stored in tides and it is possible to tap into this renewable resource with tidal power plants.
		Tidal electricity generation involves the construction of a barrage across a delta, estuaries, beaches, or other places that are affected by the tides [1].
	www.oceansatlas.org /cds_static/en/tidal_energy__en_3061_all_1.html (372 words)

	[No title]
		Tidal power has the extra problem of having to be located in a coastal environment where engineering is likely to be even more costly due to the changeability of the coast.
		Tidal energy is generated from the power of the changing tides, called tidal range (the difference between height of high tide and low tide point).
		Tidal power generating equipment is also very efficient compared to other modes of power generation and, in general, the bigger the power generating equipment, the higher the efficiency.
	www.aedsb.org /jbs-june2000-salequzzaman.doc (4713 words)

	Ocean Energy (Site not responding. Last check: 2007-10-11)
		The main method of utilization of tidal energy is to generate electricity.
		The tidal power stations can be divided into three types according to its operation method and requirement upon equipment, which are single-reservoir and single-direction type, single-reservoir and two-direction type and the two-reservoir and single-direction type.
		For single-reservoir and single-direction type tidal power stations, the penstock will be opened during the floor tide to fill water to the reservoir; be closed during the slack tide.
	www.newenergy.org.cn /english/ocean/science/tide (431 words)

	New Scientist Breaking News - First power station to harness Moon opens
		The device harnesses the tidal energy of the sea in the same way windmills tap into the power of air currents.
		Tidal energy has one key advantage over other renewable forms of power - it has the potential to provide a near continuous source of power 24 hours a day.
		This means that tidal power has the potential to make a significant contribution to the baseload - the minimum amount of electricity needed by a country and usually provided by coal and nuclear power plants.
	www.newscientist.com /article.ns?id=dn4188 (609 words)

	Tidal Energy - Other Renewable Energy Sources - GEDA
		Energy can be extracted from tides by creating a reservoir or basin behind a barrage and then passing tidal waters through turbines in the barrage to generate electricity.
		Tidal energy is extremely site specific requires mean tidal differences greater than 4 metres and also favourable topographical conditions, such as estuaries or certain types of bays in order to bring down costs of dams etc.
		The maximum tidal range in Sunderbans is approximately 5 m with an average tidal range of 2.97 m.
	www.geda.org.in /other_sources/other_re_sources.htm (320 words)

	Vision Engineer - Tidal Energy (Site not responding. Last check: 2007-10-11)
		Towards the coast, the tidal amplitude are increased by the sheving of the sea bed and funneling of esturies.
		A tidal barrage is a construction built across an estuary consisting of a series of gated sluices and low-head turbine generators.
		Tidal energy is a renewable resource that does not result in the emission of pollutants into the atmosphere.
	www.visionengineer.com /env/tidal.shtml (357 words)

	EIA Kids Page - Energy from the ocean
		Tidal fences have less impact on the environment than tidal barrages although they can disrupt the movement of large marine animals.
		One way to harness wave energy is to bend or focus the waves into a narrow channel, increasing their power and size.
		The energy from the sun heats the surface water of the ocean.
	www.eia.doe.gov /kids/energyfacts/sources/renewable/ocean.html (803 words)

	EERE: Ocean Energy (Site not responding. Last check: 2007-10-11)
		Ocean energy draws on the energy of ocean waves, tides, or on the thermal energy (heat) stored in the ocean.
		The dam includes a sluice that is opened to allow the tide to flow into the basin; the sluice is then closed, and as the sea level drops, traditional hydropower technologies can be used to generate electricity from the elevated water in the basin.
		New Wave Energy Prototypes Deployed in Hawaii and New Jersey
	www.eere.energy.gov /RE/ocean.html (207 words)

	TOPEX/Poseidon: Revealing Hidden Tidal Energy
		As much as 30% of the total energy in the ocean may be scattered by rough topography found at the bottom of the sea.
		New research suggests that tidal swells break up and dissipate energy as they move past the rough terrain of undersea mountains and ridges in much the way that sound waves are scattered in a room with lots of obstructions.
		In beginning to look for where the missing tidal energy was lurking amid earth's various geophysical systems, researchers first had to map the ocean tides to a precise degree.
	svs.gsfc.nasa.gov /stories/topex (989 words)

	Professor Quester Answers - Geothermal & Tidal Energy
		First, sound is a form of energy that travels from the source to our ears by the vibration of air molecules.
		The energy is most sounds is small, for example, the sound energy of 200 pianos is equal to the electrical energy needed to light just one light bulb.
		Tidal energy, like many forms of alternative energy, have high capital costs and need for improved performance before it can become commercially available.
	www.energyquest.ca.gov /ask_quester/answers_geothermal.html (651 words)

	Tidal Power (index of resources) (Site not responding. Last check: 2007-10-11)
		Consortium Examines Tidal Power Generation for UK - The first Tidal Delay pilot plant in the UK, to be constructed in 2007/2008, will initiate a series of plants that will contribute to the UK's commitment to renewable energy and further enhance the UK's strength in marine energy technology leadership.
		Energy from the Cornwall Tide is Just a Channel Away - A group of researchers in England are contemplating an offshore Ocean Hydro Electricity Generator power plant.
		Why Tidal Energy is Unfeasible - William A. Rhodes explains the dynamics of such a system that must both handle infrequent fluctuations as well as hurricanes.
	www.freeenergynews.com /Directory/Tidal (641 words)

	Tidal Energy Marketing Inc.
		Tidal Energy Marketing Inc. is a full service crude oil and natural gas liquids (NGLs) marketer headquartered in Calgary, Alberta, Canada.
		Tidal currently markets over 75,000 bpd of Western Canadian hydrocarbons for over 100 small to medium sized producers and for the Government of Alberta.
		Tidal's primary business focus is on creating value for our suppliers.
	www.tidal-energy.com (121 words)

	Water Power Presents: Tidal Power (Site not responding. Last check: 2007-10-11)
		The tides go in and out, and we can capture energy from this with tidal power stations.
		Tidal power stations can stretch over a delta, estuaries, beaches or other places that are affected by the tides.
		Tidal power stations are very expensive to build and they often create electricity when it isn't needed as much.
	waterpower.hypermart.net /tidal.html (323 words)

	Tidal Energy, Alternate Energy
		The tidal turbine generator, which functions like an underwater windmill, will be anchored to the seabed, and cables will carry away the electricity it generates.
		The tidal turbine generator, which functions like an underwater windmill, will be anchored to the seabed.
		Pearson College near Victoria is testing the waters of tidal power with a new turbine generator to run the Race Rocks ecological preserve.
	www.racerocks.com /racerock/news/2005/tidal.htm (1433 words)

	RenewableEnergyAccess.com \| South Korea to Build World's Largest Tidal Power Plant
		The tidal power plant, with a total project cost of approximately USD $250 million, would be the first of its kind in South Korea and the largest in the world, according to the developers and companies involved.
		The Sihwa Lake Tidal Power Plant is set to open up a new chapter in the domestic alternative energy development as South Korea plans to significantly increase spending on alternative energy sources in the coming years.
		TSS Part 2: A multi basin system assumes the energy of the tide is being harnessed through turbines on both the rising and falling of the tide with non- generating periods at high and low 'slack' tides.
	renewableenergyaccess.com /rea/news/story?id=31016 (1527 words)

	tidal energy (Site not responding. Last check: 2007-10-11)
		Tidal fences are composed of individual, vertical axis turbines mounted in caissons to comprise a pier (or fence) with an approximate 12-foot “above-water profile.” These fences are attached to the marine bottom on a rock-filled bed and secured by piles at the joints.
		Such a fence, with a tidal flow of three knots, could produce 30 megawatts per tide (a minimum of one knot is required to turn the turbines).
		While the technology behind tidal power is neither new nor overwhelmingly complex, Blumenfeld points out that every tidal generation plant in the world faces the same problem of “re-inventing the wheel.” There are no ready-made “one size fits all’ designs.
	www.baycrossings.com /Archives/2002/09_October/tidal_energy.htm (2581 words)

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