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Directory:Tidal Power

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Directory of Resources Regarding Tidal Power

See also: PowerPedia:Tidal Power at PESWiki


Tidal power, sometimes called tidal energy, is a form of hydropower that exploits the movement of water caused by tidal currents or the rise and fall in sea levels due to the tides.

Although not yet widely used, tidal power has potential for future electricity generation and is more predictable than wind energy and solar power. Harnessing the in and out fluctuations of tidal waters. Covering everything from research and development to commercial applications worldwide.

Since at least 1958, man has been harnessing the power of tides to produce electricity. But harnessing tide power has been ongoing since prehistoric times.

Contents

Categories of Tidal Power

Tidal power can be classified into two main types:

  • Tidal stream systems make use of the kinetic energy from the moving water currents to power turbines, in a similar way to wind mills use moving air. This method is gaining in popularity because of the lower cost and lower ecological impact.
  • Barrages make use of the potential energy from the difference in height or Hydraulic head between high and low tides. Barrages suffer from the problems of very high civil infrastructure costs, few viable sites globally and environmental issues.

Modern advances in turbine technology may eventually see large amounts of power generated from the ocean especially tidal currents using the tidal stream designs. Tidal stream turbines may be arrayed in high velocity areas where natural flows are concentrated such as the west coast of Canada, the Strait of Gibraltar, the Bosporus, and numerous sites in south east Asia and Australia. Such flows occur almost anywhere where there are entrances to bays and rivers, or between land masses where water currents are concentrated.

A factor in human settlement geography is water. Human settlements have often started around bays, rivers, and lakes. Future settlement may one day be concentrated around moving water, allowing communities to power themselves with non-polluting energy from moving water.

Overviews

  • US Researchers Hope to Tap Ocean Flows for Electricity - Researchers in Florida say even gentle flows of two or three knots of ocean or tidal currents could provide a cheap source of clean energy and help replace oil or coal-based systems. (Voice of America; Mar. 6, 2008)
  • Ocean Energy Potential - Ocean energy is mostly in an experimental stage but some of its component technologies have the potential to become mainstream energy sources and are now being trialed. Elementary primer on three basic ways to tap the ocean for its energy. We can use the ocean's waves, we can use the ocean's high and low tides, or we can use temperature differences in the water. (EnergyBusinessReports; June 25, 2007) [Don't forget current and salt/fresh mixing.]
  • Horizontal versus Vertical Axis Ocean Turbines - A review of the leading tidal power technologies and a comparison of the advantages and disadvantages of the horizontal axis design versus the vertical axis design. (PESN; Aug. 7, 2007)
  • Ocean Energy Report for 2005 - "Without a doubt, ocean energy made a splash in 2005. But in 2006, here's hoping for a tidal wave." -- Carolyn Elefant, OREC. (Renewable Energy Access; Jan. 9, 2006)
  • WorldEnergy.org - Gives one of the best reports on current and planned tide power projects around the world, beginning as early as 1958.
  • Northern Tidal Flows: Reliable New Power Source for Quebec? - This proposal involves tapping the lunar orbit, one of the largest “wheelworks of nature‿ to which humanity has access. Distance and climate challenges are obstacles, along with politics, cost and choice of transmission technology. (PESN; Aug. 14, 2006)
  • A Rising Wave of Tidal Power - A number of companies vie for the best sites to harness energy from flowing water, including that of large rivers. The best sites are under investigation, and companies are staking claims on where best to construct new power plants. (CBS News; Nov. 4)
  • Swell Potential for Maine Ocean Energy - A one-year study by the Electric Power Research Institute concluded that Maine's tidal power potential provides an excellent resource that could produce electricity at costs competitive with wind and natural gas, and less expensive than solar and so-called "clean coal." (RenewableEnergyAccess; May 17, 2006)
  • Review by GCK Technology (PDF) - Good report on history of tide power, including prehistoric and middle ages tide wheels (under London Bridge 1580)
  • Passamaquoddy: JFK's tidal dream that might have been - The story of John F. Kennedy's efforts 43 years ago (just prior to his assassination) to supply 60 million people with clean energy from a free source -- tides -- which can supply electricity 24 hours a day with turbines that run with the in- and out-bound tides.
  • Tidal Power for San Francisco - The tides at the Golden Gate offer one of the best locations on the western coast of North America, capable of generating as much as 38 megawatts of power -- enough alternative energy to provide power to nearly 40,000 San Francisco homes. (The Energy Blog; Sept. 23)

Companies

  • Hydro > Tidal > Largest >
    Largest tidal power device unveiled - A device thought to be the largest tidal turbine of its type to be built in the world has been described by its developer as "simple and robust". The AK1000 by Atlantis Resources stands 22.5m (73ft) tall and weighs 1,300 tonnes and is capable of generating 1 megawatt. Its blades, turning at six to eight revolutions per minute pose no threat to marine life. (BBC; Aug. 12 2010)
  • Hydro > Tidal >
    Underwater Ocean kites to harvest tidal energy - A Swedish startup has acquired funding for beginning scale model trials of underwater kites, which would be secured to a turbine to harness tidal energy for power, allegedly at 10 times the speed of the actual tidal current. With a 12-meter wingspan on the kite, the company says one unit could harvest 500 kilowatts while it's operational. (Good; May 13, 2010)
  • Top 100 / Featured: Hydro > Tide / Ocean Current >
    Marine Current Turbines' 1 MW SeaGen - SeaGen, designed and developed by Marine Current Turbines Ltd. of Britain, works in principle much like an “underwater windmill”, with the rotors driven by the power of the tidal currents rather than the wind, and has now generated at its maximum capacity of 1.2MW. (PESWiki; Jan. 7, 2009)
  • Venturi Turbine increases turbine efficiency - The highest efficiency ever achieved from a water current turbine - is a Patented leading if not world best design. The technology offers higher power output and commercial returns compared to existing designs and is currently being commercialized globally with a cost per kW of US$0.01- US$0.03 cents depending on the site.
  • Verdant Leads River/Tide Energy Pursuit - Verdant Power is a world leader in commercializing low-impact kinetic hydropower solutions, harnessing the energy from river, tide, and man-made channels. Prototype array is presently producing power for customers.
  • Blue Energy - Company now implementing its technology commercially. Turbine design, which acts as a highly efficient underwater vertical-axis windmill, could product energy for as cheaply as two cents per kilowatt hour, well below commercial grid energy wholesale prices today.
  • Underwater Electric Kite (UEK) Corporation - Low impact hydrokinetic turbines harness tide and river flow, without harming aquiatic life, requiring no dam or impoundment. Commercial energy generation cost estimated at between 1.8 and 2.8 cents per kW-h.
  • Featured: Ocean > Tidal Power >
    Atlantis Resources Corporation -- Nereus and Solon Tidal Turbines - Atlantis has developed two families of sub-sea turbines, extensively tested over a decade of field trials. Nereus™ is a shallow water turbine which has been extensively tested, and grid connected in Australia. Solon™ is a deep water turbine for installation in some of the fastest flowing currents in the world. (PESWiki; Sept. 23, 2008)
  • FreeFlow 69 > Osprey Ocean Turbine Progresses Toward Commissioning - A small team of engineers in Cornwall has made a breakthrough with the development of a turbine, called the Osprey, that they claim could solve the commercial viability of tidal power. The Osprey turbine can be used to create electricity offshore at sea or in tidal rivers and inland waterways. (PESN; Aug. 17, 2007)
  • Neo-AeroDynamic Wind/Water Turbine - The patent-pending turbine for wind and water, invented by Phi Tran, employs lift on the leeward edge, harnessing the turbulence that usually impedes efficiency. The price point is expected to be better than fossil-fuel-generated electricity, even in low wind areas, making it ideal for city/urban roof top and back yard settings.
  • Tidal and River Turbine by University of Southampton - The University of Southampton's minimalist design significantly reduces the number of moving parts, and is fully assembled prior to installation, reducing costs. Estimates five years to commercialization.
  • Balkee Tide and Wave Electricity Generator - Raj Balkee of Mauritius, has invented an energy conversion device that uses a floating buoy to advance a unidirectional generator, harnessing the up-and-down motion of waves and tide. Seeks participation to further advance the design and project. (PESWiki)
  • 33 foot Underwater Windmill powers 35 homes - The tidal turbine is bolted to the floor of the Kvalsund Channel and was connected to the nearby town of Hammerfest's power grid on September 20. It is the first time in the world that electricity directly from a tidal current has been fed into a power grid. (National Geographic; Oct. 2003)
  • Water Wall Turbine - Massive paddle wheel turns close to the speed of the water, not endangering the fish, while efficiently converting tidal flow into electricity. Installation cost in the range of 1000 USD/KW for a 40 MW unit, with 1 year to production. Energy production in range of 3 cents / kW-h. Moving parts are ~4 m above water.
  • ScotRenewables - Free-floating tidal current energy converter with dual counter-rotating horizontal-axis rotors driving generators within sub-surface nacelles, suspended from a surface buoyancy tube. It is anchored to the seabed via a yoke arrangement and compliant mooring system with a separate flexible power and control umbilical that connects to a subsea junction box.
  • Tidekraft - Three blade windmills that are relatively easy and inexpensive to produce are adapted to underwater tidal flow with a modular design, allowing all critical components to be lifted out of the water in one operation for maintenance and repair. By rotating the propeller blades around their own axis at slack water when the current turns, the mill is ready for the reversing current.
  • Oscillating Water Column - Technology for harnessing the motion of ocean/sea waves as they push an air pocket up and down behind a breakwater. Wells Turbine inside generates electricity from rotation in the same direction, whether the air is moving forward or backward.
  • Pulse Generation - Pulse generators cause hydrofoils to oscillate up and down, efficiently taking energy from tidal flows and transmitting it to a generator held above the water, where it is accessible for maintenance. Ideally suited to near-shore, shallow tidal flows, located close to areas of high demand and large scale transmission networks.
  • HydroVenturi - The Rochester Venturi is a pressure amplifier that accelerates tidal flows to create a pressure drop where the flow is most constricted, pulling air from another location into the primary flow. This secondary flow allows generation of electrical power without moving or electrical parts under water, and with minimal frictional losses over large distances.
  • OpenHydro - The Open-Centre Turbine, with just one moving part and no seals, is a self-contained rotor with a solid state permanent magnet generator encapsulated within the outer rim, minimising maintenance requirements. It is one of the first tidal technologies in the world to reach the stage of permanent grid connected deployment at sea, at the European Marine Energy Centre (EMEC) in Orkney.
  • Crest Energy - Plans to generate power for 250,000 New Zealand homes, or 200 MW, by harnessing the power of tidal flows in to and out of the Kaipara Harbour. The project should generate about 4% of New Zealand's electricity supply from 200 turbines.
  • Woodshed Technologies - Tidal Delay relies on the seawater restraining feature of natural coastal landforms, such as peninsulas or isthmuses, to create a time delay or “phase difference‿ between the two sides. Connections across the landforms with sea-water carrying pipes incorporating a turbine and generator, enables the stored potential energy to be harnessed.
  • Hydro Green Energy - Builds and operates kinetic hydro power projects that generate electricity from moving water (river currents, tidal currents, and ocean currents) without having to construct dams or other infrastructure. Hydropower Turbine Arrays are inexpensive to manufacture, can be designed for different types of conditions and produce the lowest cost hydropower commercially available.
  • Tidal Electric - Tidal lagoons utilise an offshore impoundment structure that looks like a rocky island. The impoundment is fitted with conventional low-head hydroelectric generating equipment and produces predictable power. OFGEM report finds tidal lagoons cheaper than offshore wind.
  • FreeFlow 69 - The Ocean Hydro Electricity Generator Plant uses tidal energy to create electricity 24 hours a day, using both the kinetic energy in tidal flow and the potential energy created by tidal height changes. The O.H.E.G. plant makes an ideal foundation for offshore wind turbines, combining both tidal energy and wind energy.
  • Fieldstone Tidal Energy - Harvests river and tidal energy. "System is capable of producing energy in the megawatt range, and more importantly connects to the grid sychronously; with zero fish kill."
  • SMD Hydrovision - TidEl tidal stream generator floats and is restrained submerged to the seabed using a mooring arrangement. Generates electricity at prices comparable with wind power.
  • TidalStream - A tidal stream turbine is just like a wind turbine underwater, except that the density of seawater is 800 times greater than air, and flow rates typically one fifth.
  • Marine Current Turbines has developed a new technology for exploiting tidal currents for large-scale power generation. 1MW SeaGen tidal device set to be installed in Northern Ireland’s Strangford Lough.
  • GCK Technology - The Gorlov Helical Turbine (GHT) was specifically designed for hydroelectric applications in free flowing low head water courses. Demonstrates superior power efficiency in free currents compared to other known turbines. Rotates at twice the velocity of the water current flow. Inexhaustible energy from flowing water created by: Rivers, Tidal currents, Ocean currents.
  • Tidal Power River Testing in 2008 - Neptune Renewable Energy has been working on a tidal power device that uses a vertical axis Savonius turbine mounted in an accelerator duct. It has a theoretical efficiency of 60-80% and manufacturing costs are minimal, which could result in commercially competitive tidal electricity. (Green Car Congress; Sep. 22, 2007)
  • BioPower Systems - The tidal energy conversion system, bioSTREAM™, is based on the highly efficient propulsion of Thunniform mode swimming species, such as shark, tuna, and mackerel. It mimics the shape and motion of these species but is a fixed device in a moving stream. The energy in the passing flow is used to drive the device motion against the resisting torque of the O-DRIVE™ electrical generator.
  • Ocean Renewable Power Company - ORPC is developing modular ocean current generation OCGen™ technology and incorporating it into tidal and ocean current generation projects. The company plans to deploy and test an OCGen™ Turbines Generation Unit at its Western Passage, Maine site in late 2007.
  • Vortex Oscillation Technology - Generators with oscillating actuating bodies can give several times lower cost electric power. It is possible to produce generators from 0.1 Kw up to 100 Mw, from wind, rivers, tide and sea currents.
  • Neptune Systems - Developing tidal energy converter systems based upon magneto hydro dynamic (MHD) concepts that can convert tidal motion directly into power using no moving parts. This device can simultaneously store the electricity it produces or that is produced by other generators (like offshore wind turbines) with a high storing capacity.
  • Lunar Energy - The duct captures a large area of the tidal stream and accelerates the flow through a narrowing channel into the turbine. The turbine is of a symmetrical design and capable of bi-directional operation obviating the need for a pitch or yaw control thus keeping the design simple and more cost effective.
  • The Engineering Business - Stingray Tidal Stream Generator consists of a hydroplane which has its attack angle relative to the approaching water stream varied by a simple mechanism. This causes the supporting arm to oscillate which in turn forces hydraulic cylinders to extend and retract. This produces high pressure oil which is used to drive a generator.
  • Robert Gordon University - Sea Snail seabed mounted tidal current turbine is based on the familiar upturned aerofoil found on most racing cars. A number of hydrofoils are mounted on a frame in such a way as to induce a downforce from the stream flow.
  • E3, Inc. - Natural Currents is prototyping a 3 Meter version of an eventual 1 MW Ocean Energy System, that provides simplicity and effectiveness. Its design allows it to rotate in one direction regardless of the direction of the water flow. The system is particularly effective in regions that experience ice cover for part of the year.
  • ScotRenewables - Free-floating tidal current energy converter with dual counter-rotating horizontal-axis rotors driving generators within sub-surface nacelles, suspended from a surface buoyancy tube. It is anchored to the seabed via a yoke arrangement and compliant mooring system with a separate flexible power and control umbilical that connects to a subsea junction box.
  • Ocean Flow Energy - Evopod uses a simple but effective mooring system that allows the free floating device to maintain optimum heading into the tidal stream. It can operate in exposed deep water sites and uses established technologies from the offshore oil and gas and wind turbine industries.
  • New Energy Corporation Inc. - NECI's EnCurrent Turbine enables the extraction of electricity from water currents without the need for the dams and barrages. Slowly rotating turbine blades virtually eliminates fish kill and bi-directional operation enables the economic extraction of power in tidal applications.
  • Tidal Sails - Like a set of vertical blinds under water which are being pulled from start to end station by the tidal current. A magazine at the start station deploys sails at certain intervals; at the same time as the end station magazine is detaching and collecting arriving sails. Huge sails affixed to long cables under water are pulled by the tidal stream, feeding a generator, which in turn produces electricity.
  • Oceana Energy Co. - Developing tidal power generation technology that operates on principles far different from that of under water windmills, to improve manufacturability, ease of operation and cost. The Tidal Defense and Energy System (TIDES)™ power generation platform is being developed in cooperation with the U.S. Navy.
  • Ponte di Archimede - The Kobold turbine is a rotor mounted on a vertical shaft which produces mechanical energy by exploiting marine tidal currents, rotates independently of the direction of the current, has high torque, is self starting, and has efficiency comparable to wind turbines.
  • Clean Current Power Systems - The tidal turbine generator is a bi-directional ducted horizontal axis turbine with a direct drive variable speed permanent magnet generator. This design delivers superior efficiency, enhanced by a simple design that has one moving part - the rotor assembly that contains the blades.
  • Bourne Energy - The TidalStar is an interconnected series of energy absorbing modules with these advantages: 1. No tidal barrage, embankments, caissons or sluices required. 2. Does not restrict movement of marine life. 3. Does not affect salinity or turbidity of water. 4. Does not increase sediment or pollution accumulation. 5. Low visibility.
  • Tidal Generation - Developing deep water tidal turbines to generate electricity from tidal flows, fully submerged out of the wave zone for reliability and low visibility. Currently working on a prototype, to be installed at the European Marine Energy Centre in Orkney.
  • Swanturbines - The most economically reliable tidal turbine is a simple, robust, gearless axial flow turbine. The design allows simple installation and maintenance retrieval in both shallow and deep water and minimises vibrations and maintenance. A gearless low speed generator offers a high efficiency over a range of speeds.
    • Swanturbines direct drive increases reliability by 33% - The Swanturbines Cygnet device will begin assembly in South Wales after the completion of its marinised gearless generator. The system removes the need for gearing or hydraulics in the drive train and is expected to increase turbine reliability by 33%. (Video) (Tidal Today; Feb. 24, 2009)
  • Tidal flow to power New York City - Verdant Power planning to install turbines in the East River. $4.5-million project to build farm of tide-powered turbines. Starting at 6 turbines generating a total of 200kw; they plan to implement 200 - 300 turbines. (Nature; Aug. 13, 2004) (Verdant)
  • Verdant Energy deploys Tidal Turbines (9 min) - Turbines look like typical horizontal axis wind turbine, except they harness the moving water from tides in Manhattan's rivers. After test phase, hundreds could be installed to power around 9,000 homes. (New York Times; Jan. 2, 2006)
  • 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. (Renewable Energy Access; Oct. 19, 2005)
  • Mersey River tidal power station proposed - The Mersey River may soon become the first river in Britain to generate electricity by tidal activity. River hydro fence would taps 2 gigawatts of electricity. (PhysOrg; Nov. 2005)
  • Hydro-Gen - Hydro-Gen is a big floating paddle wheel included in a catamaran type turbine, for marine currents where a huge quantity of sea water must go through a bottle neck. The efficiency/cost ratio seems better with a paddle-wheel, because it is at the surface. Underwater projects are three to five times more costly.
  • Sea change for tidal power - The TidEl system uses floating turbines that are anchored to the seabed by chains. The underwater windmills drift back and forth with the tide, so they point in the best direction to get power from the spinning blades. (Nature; Mar. 24, 2004)
  • Atlantis Resources - The Aquanator™ is a highly complex turbine which comprises a central monorail system which houses Aquafoils™ mounted on a central rail system. These Aquafoils™ are designed to efficiently capture the kinetic energy present in both tidal and geostophic flow.

Tidal Lagoons

Other Instances of Tidal Power

  • Hydro > Tidal >
    Re-Purposing the Netherlands' Dike System for Power Generation - The Dutch system of dikes, sluices, surge barriers, and dams has been dubbed 'one of the seven wonders of the modern world' by the American Society of Engineers. Now there are proposals to use the system differently, e.g. as tidal power plants, by punching holes in them. (NRC Handelsblad; Apr. 21, 2010)

Research and Development

  • Hydro > Tidal >
    Minesto Kite to Harness Tidal Energy - The underwater kite by Minesto move 10 times faster than the tidal flow at any given time. Speed and energy have a cubic relationship, whereby a kite moving 10 times the speed of the surrounding water yields 1,000 times the energy of the flow on the kites. (Forbidden Knowledge / YouTube; December 2009)
  • Hydro > Tide >
    New horizontal design for harnessing tidal energy - A new company, Kepler Energy Ltd., has been formed to develop a tidal turbine which has the potential to harness tidal energy more efficiently and cheaply, using a device which is simpler, more robust and more scaleable than current designs. The turbine is the result of research at Oxford University's Department of Engineering and thermofluids laboratory. (PhysOrg; Oct. 26, 2010)
  • Navy, PUD both hunt for power from tides - The Navy expects to drop tidal turbines into the water off Marrowstone Island in Admiralty Inlet in 2010, not far from where the Snohomish County PUD is studying installing equipment of its own the following year. (Heraldnet; Jan. 28, 2009)
  • Ocean Wave >
    Hydrospiral Project - This proposal by Claudio Bianco is based on a phenomenon called undertow or rip current. The hydrospiral would not only generate electricity, but it could also indirectly help to regenerate marine life, prevent erosion on the coast and filter the ocean water.
  • France Plans Groundbreaking Tidal Power Experiment - Electricite de France (EDF) has announced that it plans to build a pilot tidal turbine system off Paimpol in Brittany, due to the extremely strong currents. The plan calls for 3 to 6 turbines to be built with capacities between 4 and 6 MW by 2011. (Clean Technica; July 28, 2008)

In the News

  • Hydro > Tide >
    New horizontal design for harnessing tidal energy - A new company, Kepler Energy Ltd., has been formed to develop a tidal turbine which has the potential to harness tidal energy more efficiently and cheaply, using a device which is simpler, more robust and more scaleable than current designs. The turbine is the result of research at Oxford University's Department of Engineering and thermofluids laboratory. (PhysOrg; Oct. 26, 2010)
  • Hydro > Tidal >
    Re-Purposing the Netherlands' Dike System for Power Generation - The Dutch system of dikes, sluices, surge barriers, and dams has been dubbed 'one of the seven wonders of the modern world' by the American Society of Engineers. Now there are proposals to use the system differently, e.g. as tidal power plants, by punching holes in them. (NRC Handelsblad; Apr. 21, 2010)
  • Hydro > Tidal > Atlantis >
    Atlantis To Test World's Biggest Tidal Turbine - Atlantis Resources Corp is to test the world's biggest tidal turbine in the rough waters off the Orkney Islands next year in preparation for Scotland's plan to use ocean energy for half a million homes by 2020. The AK-1000 turbine has rotors that are 18 meters in diameter, the height of five storey building and has a capacity of 1 megawatt. (Planet Ark; Dec. 1, 2009)
  • Tidal Power > Current events >
    Tidal Energy Summit '08 - November 11-12, 2008, Regents Park Marriot, London, England. The 2nd Annual Tidal Energy Summit is the only event dedicated to the future of Tidal Energy. And with over 30+ Tidal developers already signed up to attend, will be the highest concentration of dedicated Tidal pioneers.
  • Bay of Fundy to get 3 test turbines - The government of Nova Scotia, Canada, picked three candidates to test their tidal power generators in the Bay of Fundy, which has the highest tides in the world. It would be North America's first tidal power test site and it could be up and running as early as next year with turbines from Underwater Electric Kite, OpenHydro and Clean Current. (Cleantech.com; Jan. 9, 2008)
  • Tidal Power Options in SF Bay - A comprehensive study will assess the possibilities for harnessing the tides in San Francisco Bay to create a new source of zero-emissions, renewable electric power for California. Future plans could ultimately lead to the development of a full-scale commercial project. Tidal power offers the advantage of being highly predictable and reliable. (Green Car Congress; Jun. 19, 2007)
  • The Power of the Tides in N.Y. - A pilot project being conducted by Verdant Power in New York's East River is evaluating the use of underwater turbines to generate electricity. Unlike wind and solar energy, this technology is not episodic. Utilities would be able to predict exactly how much power they could derive on a regular basis from a group of turbines. (Renewable Energy Access; Apr. 16, 2007)
  • N.S. Power to test new tidal power generator - Nova Scotia Power is looking at in-stream tidal power as an alternative to its 20 MW tidal dam. An Irish partner, OpenHydro, will build a 1 MW test turbine in the Bay of Fundy, site of the world’s highest tides. The installation won't be operational before 2009, and it will require a turbine "farm" to produce significant amounts of power. (CBC News; January 12, 2007)
  • Video of Underwater Turbines Being Installed - The New York Times has a video of the installation of two turbines near Roosevelt Island in New York City- one is a test device to monitor fish and conditions, the other generating power. Tide-powered underwater turbines look like windmills, but use tidal currents to make electricity. (TreeHugger; January 2, 2007)
  • Turbines expected to make waves Verdant Power - After two years of waiting for all the required approvals, the project was green-lighted by the state's Department of Environmental Conservation around Labor Day. The final okay must be given by the Army Corps of Engineers, but that has yet to happen. (DAILY NEWS; Oct. 25, 2005)
  • Tidal flow to power New York City - Verdant Power planning to install turbines in the East River. $4.5-million project may form the first farm of tide-powered turbines in the world. Starting at 6 turbines generating a total of 200kw; they plan to implement 200 - 300 turbines. (Nature; Aug. 13, 2004)
  • Sea change for tidal power - The TidEl system uses floating turbines that are anchored to the seabed by chains. The underwater windmills drift back and forth with the tide, so they point in the best direction to get power from the spinning blades. (Nature; Mar. 24, 2004)

Backing

  • Verdant Power - Company installing tidal power generators in the East River of New York City
  • New Business Cycle Expected for Ocean Energy - After securing helpful policy items in the recently passed House-Senate energy bill, proponents of ocean energy are looking forward to an accelerated business cycle for the nascent renewable energy technology. (Renewable Energy Access; Aug. 5, 2005)

Skeptics

  • 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.
  • Indian Tidal Power Plant to Threaten Tigers - Tigers in the world's largest reserve for the big cats are threatened by Indian plans for a tidal power project that will only pro]]vide electricity for a few thousand families. (Reuters; July 3, 2006)
  • Tidal Power Delayed for Whale - Annapolis Tidal Generating Station temporarily shuts down as young humpback whale explores the River off of the Bay of Fundy in Nova Scotia. (Solar Access; Aug. 26, 2004)

Directories

See also

Directory:Marine Current Turbines HYDRO FOOTER

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