Tidal power

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Sihwa Lake Tidal Power Station, located in Gyeonggi Province, South Korea, is the world's largest tidal power installation, with a total power output capacity of 254 MW. Sihwa Lake Tidal Power Station 01.png
Sihwa Lake Tidal Power Station, located in Gyeonggi Province, South Korea, is the world's largest tidal power installation, with a total power output capacity of 254 MW.
The Rance Tidal Power Station, in Brittany, northwestern France, was the first large-scale tidal power station (1966), with a total power output capacity of 240 MW Barrage de la Rance.jpg
The Rance Tidal Power Station, in Brittany, northwestern France, was the first large-scale tidal power station (1966), with a total power output capacity of 240 MW

Tidal power or tidal energy is harnessed by converting energy from tides into useful forms of power, mainly electricity using various methods.

Contents

Although not yet widely used, tidal energy has the potential for future electricity generation. Tides are more predictable than the wind and the sun. Among sources of renewable energy, tidal energy has traditionally suffered from relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow velocities, thus constricting its total availability. However many recent technological developments and improvements, both in design (e.g. dynamic tidal power, tidal lagoons) and turbine technology (e.g. new axial turbines, cross flow turbines), indicate that the total availability of tidal power may be much higher than previously assumed and that economic and environmental costs may be brought down to competitive levels.

Historically, tide mills have been used both in Europe and on the Atlantic coast of North America. Incoming water was contained in large storage ponds, and as the tide goes out, it turns waterwheels that use the mechanical power to mill grain. [1] The earliest occurrences date from the Middle Ages, or even from Roman times. [2] [3] The process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe in the 19th century. [4]

Electricity generation from marine technologies increased an estimated 16% in 2018, and an estimated 13% in 2019. [5] Policies promoting R&D are needed to achieve further cost reductions and large-scale development. The world's first large-scale tidal power plant was France's Rance Tidal Power Station, which became operational in 1966. It was the largest tidal power station in terms of output until Sihwa Lake Tidal Power Station opened in South Korea in August 2011. The Sihwa station uses sea wall defense barriers complete with 10 turbines generating 254 MW. [6]

Principle

Variation of tides over a day Tide type.svg
Variation of tides over a day

Tidal energy is taken from the Earth's oceanic tides. Tidal forces result from periodic variations in gravitational attraction exerted by celestial bodies. These forces create corresponding motions or currents in the world's oceans. This results in periodic changes in sea levels, varying as the Earth rotates. These changes are highly regular and predictable, due to the consistent pattern of the Earth's rotation and the Moon's orbit around the Earth. [7] The magnitude and variations of this motion reflect the changing positions of the Moon and Sun relative to the Earth, the effects of Earth's rotation, and local geography of the seafloor and coastlines.

Tidal power is the only technology that draws on energy inherent in the orbital characteristics of the Earth–Moon system, and to a lesser extent in the Earth–Sun system. Other natural energies exploited by human technology originate directly or indirectly from the Sun, including fossil fuel, conventional hydroelectric, wind, biofuel, wave and solar energy. Nuclear energy makes use of Earth's mineral deposits of fissionable elements, while geothermal power utilizes the Earth's internal heat, which comes from a combination of residual heat from planetary accretion (about 20%) and heat produced through radioactive decay (80%). [8]

A tidal generator converts the energy of tidal flows into electricity. Greater tidal variation and higher tidal current velocities can dramatically increase the potential of a site for tidal electricity generation. On the other hand, tidal energy has high reliability, excellent energy density, and high durability. [9]

Because the Earth's tides are ultimately due to gravitational interaction with the Moon and Sun and the Earth's rotation, tidal power is practically inexhaustible, and is thus classified as a renewable energy resource. Movement of tides causes a loss of mechanical energy in the Earth-Moon system: this results from pumping of water through natural restrictions around coastlines and consequent viscous dissipation at the seabed and in turbulence. This loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since its formation. During the last 620 million years the period of rotation of the Earth (length of a day) has increased from 21.9 hours to 24 hours; [10] in this period the Earth-Moon system has lost 17% of its rotational energy. While tidal power will take additional energy from the system, the effect is negligible and would not be noticeable in the foreseeable future.

Methods

The world's first commercial-scale and grid-connected tidal stream generator - SeaGen - in Strangford Lough. The strong wake shows the power in the tidal current. SeaGen installed.jpg
The world's first commercial-scale and grid-connected tidal stream generator – SeaGen – in Strangford Lough. The strong wake shows the power in the tidal current.

Tidal power can be classified into four generating methods:

Tidal stream generator

Tidal stream generators make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use the wind to power turbines. Some tidal generators can be built into the structures of existing bridges or are entirely submersed, thus avoiding concerns over aesthetics or visual impact. Land constrictions such as straits or inlets can create high velocities at specific sites, which can be captured using turbines. These turbines can be horizontal, vertical, open, or ducted. [12]

Tidal barrage

Tidal barrages use potential energy in the difference in height (or hydraulic head) between high and low tides. When using tidal barrages to generate power, the potential energy from a tide is seized through the strategic placement of specialized dams. When the sea level rises and the tide begins to come in, the temporary increase in tidal power is channeled into a large basin behind the dam, holding a large amount of potential energy. With the receding tide, this energy is then converted into mechanical energy as the water is released through large turbines that create electrical power through the use of generators. [13] Barrages are essentially dams across the full width of a tidal estuary.

Tidal lagoon

A new tidal energy design option is to construct circular retaining walls embedded with turbines that can capture the potential energy of tides. The created reservoirs are similar to those of tidal barrages, except that the location is artificial and does not contain a pre-existing ecosystem. [12] The lagoons can also be in double (or triple) format without pumping [14] or with pumping [15] that will flatten out the power output. The pumping power could be provided by excess to grid demand renewable energy from for example wind turbines or solar photovoltaic arrays. Excess renewable energy rather than being curtailed could be used and stored for a later period of time. Geographically dispersed tidal lagoons with a time delay between peak production would also flatten out peak production providing near baseload production at a higher cost than other alternatives such as district heating renewable energy storage. The cancelled Tidal Lagoon Swansea Bay in Wales, United Kingdom would have been the first tidal power station of this type once built. [16]

Dynamic tidal power

Top-down diagram of a DTP dam. Blue and dark red colours indicate low and high tides, respectively. DTP T dam top-down view.jpg
Top-down diagram of a DTP dam. Blue and dark red colours indicate low and high tides, respectively.

Dynamic tidal power (or DTP) is a theoretical technology that would exploit an interaction between potential and kinetic energies in tidal flows. It proposes that very long dams (for example: 30–50 km length) be built from coasts straight out into the sea or ocean, without enclosing an area. Tidal phase differences are introduced across the dam, leading to a significant water-level differential in shallow coastal seas – featuring strong coast-parallel oscillating tidal currents such as found in the UK, China, and Korea.

US and Canadian studies in the 20th century

The first study of large scale tidal power plants was by the US Federal Power Commission in 1924. If built, power plants would have been located in the northern border area of the US state of Maine and the southeastern border area of the Canadian province of New Brunswick, with various dams, powerhouses, and ship locks enclosing the Bay of Fundy and Passamaquoddy Bay (note: see map in reference). Nothing came of the study, and it is unknown whether Canada had been approached about the study by the US Federal Power Commission. [17]

In 1956, utility Nova Scotia Light and Power of Halifax commissioned a pair of studies into commercial tidal power development feasibility on the Nova Scotia side of the Bay of Fundy. The two studies, by Stone & Webster of Boston and by Montreal Engineering Company of Montreal, independently concluded that millions of horsepower (i.e. gigawatts) could be harnessed from Fundy but that development costs would be commercially prohibitive. [18]

There was also a report on the international commission in April 1961 entitled "Investigation of the International Passamaquoddy Tidal Power Project" produced by both the US and Canadian Federal Governments. According to benefit to costs ratios, the project was beneficial to the US but not to Canada.

A study was commissioned by the Canadian & Nova Scotian and New Brunswick governments (Reassessment of Fundy Tidal Power) to determine the potential for tidal barrages at Chignecto Bay and Minas Basin – at the end of the Fundy Bay estuary. There were three sites determined to be financially feasible: Shepody Bay (1550 MW), Cumberland Basin (1085 MW), and Cobequid Bay (3800 MW). These were never built despite their apparent feasibility in 1977. [19]

US studies in the 21st century

The Snohomish PUD, a public utility district located primarily in Snohomish County, Washington State, began a tidal energy project in 2007. [20] In April 2009 the PUD selected OpenHydro, [21] a company based in Ireland, to develop turbines and equipment for eventual installation. The project as initially designed was to place generation equipment in areas of high tidal flow and operate that equipment for four to five years. After the trial period the equipment would be removed. The project was initially budgeted at a total cost of $10 million, with half of that funding provided by the PUD out of utility reserve funds, and half from grants, primarily from the US federal government. The PUD paid for part of this project from reserves and received a $900,000 grant in 2009 and a $3.5 million grant in 2010 in addition to using reserves to pay an estimated $4 million of costs. In 2010 the budget estimate was increased to $20 million, half to be paid by the utility, half by the federal government. The utility was unable to control costs on this project, and by October 2014, the costs had ballooned to an estimated $38 million and were projected to continue to increase. The PUD proposed that the federal government provide an additional $10 million towards this increased cost, citing a gentlemen's agreement. [22] When the federal government refused to pay this, the PUD cancelled the project after spending nearly $10 million from reserves and grants. The PUD abandoned all tidal energy exploration after this project was cancelled and does not own or operate any tidal energy sources.

Rance tidal power plant in France

In 1966, Électricité de France opened the Rance Tidal Power Station, located on the estuary of the Rance River in Brittany. It was the world's first [23] tidal power station. The plant was for 45 years the largest tidal power station in the world by installed capacity: Its 24 turbines reach peak output at 240 megawatts (MW) and average 57 MW, a capacity factor of approximately 24%.

Tidal power development in the UK

The world's first marine energy test facility was established in 2003 to start the development of the wave and tidal energy industry in the UK. Based in Orkney, Scotland, the European Marine Energy Centre (EMEC) has supported the deployment of more wave and tidal energy devices than at any other single site in the world. EMEC provides a variety of test sites in real sea conditions. Its grid connected tidal test site is located at the Fall of Warness, off the island of Eday, in a narrow channel which concentrates the tide as it flows between the Atlantic Ocean and North Sea. This area has a very strong tidal current, which can travel up to 4 m/s (8.9 mph; 7.8 kn; 14 km/h) in spring tides. Tidal energy developers that have tested at the site include: Alstom (formerly Tidal Generation Ltd); ANDRITZ HYDRO Hammerfest; Atlantis Resources Corporation; Nautricity; OpenHydro; Scotrenewables Tidal Power; Voith. [24] The resource could be 4 TJ per year. [25] Elsewhere in the UK, annual energy of 50 TWh can be extracted if 25 GW capacity is installed with pivotable blades. [26] [27] [28]

Current and future tidal power schemes

Roosevelt Island Tidal Energy (RITE) installation of three Verdant Power underwater 35-kilowatt turbines on a single triangular base (called a TriFrame) off the coast of New York City's Roosevelt Island on October 22, 2020. VerdantPower 22Oct2020 RooseveltIsland.jpg
Roosevelt Island Tidal Energy (RITE) installation of three Verdant Power underwater 35-kilowatt turbines on a single triangular base (called a TriFrame) off the coast of New York City's Roosevelt Island on October 22, 2020.

Issues and challenges

Environmental concerns

Tidal power can affect marine life. The turbines' rotating blades can accidentally kill swimming sea life. Projects such as the one in Strangford include a safety mechanism that turns off the turbine when marine animals approach. However, this feature causes a major loss in energy because of the amount of marine life that passes through the turbines. [54] Some fish may avoid the area if threatened by a constantly rotating or noisy object. Marine life is a huge factor when siting tidal power energy generators, and precautions are taken to ensure that as few marine animals as possible are affected by it. In terms of global warming potential (i.e. carbon footprint), the impact of tidal power generation technologies ranges between 15 and 37 gCO2-eq/kWhe, with a median value of 23.8 gCO2-eq/kWhe. [55] This is in line with the impact of other renewables like wind and solar power, and significantly better than fossil-based technologies. The Tethys database provides access to scientific literature and general information on the potential environmental effects of tidal energy. [56]

Tidal turbines

The main environmental concern with tidal energy is associated with blade strike and entanglement of marine organisms as high-speed water increases the risk of organisms being pushed near or through these devices. As with all offshore renewable energies, there is also a concern about how the creation of electromagnetic fields and acoustic outputs may affect marine organisms. Because these devices are in the water, the acoustic output can be greater than those created with offshore wind energy. Depending on the frequency and amplitude of sound generated by the tidal energy devices, this acoustic output can have varying effects on marine mammals (particularly those who echolocate to communicate and navigate in the marine environment, such as dolphins and whales). Tidal energy removal can also cause environmental concerns such as degrading far-field water quality and disrupting sediment processes. [57] [58] Depending on the size of the project, these effects can range from small traces of sediment building up near the tidal device to severely affecting nearshore ecosystems and processes. [59]

Tidal barrage

Installing a barrage may change the shoreline within the bay or estuary, affecting a large ecosystem that depends on tidal flats. Inhibiting the flow of water in and out of the bay, there may also be less flushing of the bay or estuary, causing additional turbidity (suspended solids) and less saltwater, which may result in the death of fish that act as a vital food source to birds and mammals. Migrating fish may also be unable to access breeding streams, and may attempt to pass through the turbines. The same acoustic concerns apply to tidal barrages. Decreasing shipping accessibility can become a socio-economic issue, though locks can be added to allow slow passage. However, the barrage may improve the local economy by increasing land access as a bridge. Calmer waters may also allow better recreation in the bay or estuary. [59] In August 2004, a humpback whale swam through the open sluice gate of the Annapolis Royal Generating Station at slack tide, ending up trapped for several days before eventually finding its way out to the Annapolis Basin. [60]

Tidal lagoon

Environmentally, the main concerns are blade strike on fish attempting to enter the lagoon, the acoustic output from turbines, and changes in sedimentation processes. However, all these effects are localized and do not affect the entire estuary or bay. [59]

Corrosion

Saltwater causes corrosion in metal parts. It can be difficult to maintain tidal stream generators due to their size and depth in the water. The use of corrosion-resistant materials such as stainless steels, high-nickel alloys, copper-nickel alloys, nickel-copper alloys and titanium can greatly reduce, or eliminate corrosion damage. Composite materials could also be used, as composites do not corrode and could provide lightweight, durable structures for tidal power. [61] Composite materials are being evaluated for tidal power. [62]

Mechanical fluids, such as lubricants, can leak out, which may be harmful to the marine life nearby. Proper maintenance can minimize the number of harmful chemicals that may enter the environment.

Fouling

The biological events that happen when placing any structure in an area of high tidal currents and high biological productivity in the ocean will ensure that the structure becomes an ideal substrate for the growth of marine organisms.

Cost

Tidal energy has a high initial cost, which may be one of the reasons why it is not a popular source of renewable energy, although research has shown that the public is willing to pay for and support research and development of tidal energy devices. [63] [64] [65] The methods of generating electricity from tidal energy are relatively new technology. Tidal energy is however still very early in the research process and it may be possible to reduce costs in future. The cost-effectiveness varies according to the site of the tidal generators. One indication of cost-effectiveness is the Gibrat ratio, which is the length of the barrage in metres divided by the annual energy production in kilowatt hours. [66]

As tidal energy is reliable, it can reasonably be predicted how long it will take to pay off the high up-front cost of these generators. Due to the success of a greatly simplified design, the orthogonal turbine offers considerable cost savings. As a result, the production period of each generating unit is reduced, lower metal consumption is needed and technical efficiency is greater. [67]

A possible risk is rising sea levels due to climate change, which may alter the characteristics of the local tides reducing future power generation. [68] [69]

Structural health monitoring

The high load factors resulting from the fact that water is around 800 times denser than air, and the predictable and reliable nature of tides compared with the wind, make tidal energy particularly attractive for electric power generation. Condition monitoring is the key for exploiting it cost-efficiently. [70]

See also

Related Research Articles

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<span class="mw-page-title-main">Severn Barrage</span> Conceptual dam between England and Wales

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<span class="mw-page-title-main">Rance Tidal Power Station</span> Dam in Brittany

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References

  1. ↑ Ocean Energy Council (2011). "Tidal Energy: Pros for Wave and Tidal Power". Archived from the original on 2008-05-13.
  2. ↑ "Microsoft Word – RS01j.doc" (PDF). Archived (PDF) from the original on 2011-05-17. Retrieved 2011-04-05.
  3. ↑ Minchinton, W. E. (October 1979). "Early Tide Mills: Some Problems". Technology and Culture. 20 (4): 777–786. doi:10.2307/3103639. JSTOR   3103639. S2CID   112337062.
  4. ↑ Dorf, Richard (1981). The Energy Factbook . New York: McGraw-Hill.
  5. ↑ "Ocean power – Tracking Power 2020 – Analysis". IEA. Archived from the original on 2020-06-19. Retrieved 2020-08-25.
  6. ↑ Glenday, Craig (2013). Guinness world records 2014 . Guinness World Records Limited. ISBN   978-1-908843-15-9.
  7. ↑ DiCerto, JJ (1976). The Electric Wishing Well: The Solution to the Energy Crisis . New York: Macmillan. ISBN   9780025313200.
  8. ↑ Turcotte, D. L.; Schubert, G. (2002). "Chapter 4". Geodynamics (2nd ed.). Cambridge, England, UK: Cambridge University Press. pp. 136–137. ISBN   978-0-521-66624-4.
  9. ↑ Chowdhury, M. S.; Rahman, Kazi Sajedur; Selvanathan, Vidhya; Nuthammachot, Narissara; Suklueng, Montri; Mostafaeipour, Ali; Habib, Asiful; Akhtaruzzaman, Md.; Amin, Nowshad; Techato, Kuaanan (2021-06-01). "Current trends and prospects of tidal energy technology". Environment, Development and Sustainability. 23 (6): 8179–8194. Bibcode:2021EDSus..23.8179C. doi:10.1007/s10668-020-01013-4. ISSN   1573-2975. PMC   7538194 . PMID   33041645.
  10. ↑ George E. Williams (2000). "Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit". Reviews of Geophysics. 38 (1): 37–60. Bibcode:2000RvGeo..38...37W. CiteSeerX   10.1.1.597.6421 . doi:10.1029/1999RG900016. S2CID   51948507.
  11. ↑ Douglas, C. A.; Harrison, G. P.; Chick, J. P. (2008). "Life cycle assessment of the Seagen marine current turbine" (PDF). Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment. 222 (1): 1–12. Bibcode:2008PIMEM.222....1D. doi:10.1243/14750902JEME94. hdl: 20.500.11820/935cdfa5-aeed-423c-aa52-f51c5e5753ef . S2CID   111126521.
  12. 1 2 "Tidal – Capturing tidal fluctuations with turbines, tidal barrages, or tidal lagoons". Tidal / Tethys. Pacific Northwest National Laboratory (PNNL). Archived from the original on 16 February 2016. Retrieved 2 February 2016.
  13. ↑ Evans, Robert (2007). Fueling Our Future: An Introduction to Sustainable Energy . New York: Cambridge University Press.
  14. ↑ "Hydrological Changing Double Current-typed Tidal Power Generation" (video). YouTube . 23 September 2012. Archived from the original on 2015-10-18. Retrieved 2015-04-15.
  15. ↑ "Enhancing Electrical Supply by Pumped Storage in Tidal Lagoons" (PDF). Archived (PDF) from the original on 2015-09-24. Retrieved 2014-03-13.
  16. ↑ Elsevier Ltd, The Boulevard, Langford Lane, Kidlington, Oxford, OX5 1 GB, United Kingdom. "Green light for world's first tidal lagoon". renewableenergyfocus.com. Archived from the original on 18 August 2015. Retrieved 26 July 2015.{{cite web}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
  17. ↑ "Niagara's Power From The Tides" Archived 2015-03-21 at the Wayback Machine May 1924 Popular Science Monthly
  18. ↑ Nova Scotia Light and Power Company, Limited, Annual Report, 1956
  19. ↑ Chang, Jen (2008), "6.1", Hydrodynamic Modeling and Feasibility Study of Harnessing Tidal Power at the Bay of Fundy (PDF) (PhD thesis), Los Angeles: University of Southern California, Bibcode:2008PhDT.......107C, archived from the original (PDF) on 2012-11-22, retrieved 2011-09-27
  20. ↑ Overview,” [ permanent dead link ]
  21. ↑ Selected,” [ permanent dead link ]
  22. ↑ “PUD claims 'gentleman's agreement over tidal project funding',” Everett Herald, Oct 2, 2014,
  23. ↑ "Wyre Tidal Energy". Archived from the original on 4 February 2015.
  24. ↑ "EMEC: European Marine Energy Centre". emec.org.uk. Archived from the original on 2007-01-27.
  25. ↑ Lewis, M.; Neill, S.P.; Robins, P.E.; Hashemi, M.R. (2015). "Resource assessment for future generations of tidal-stream energy arrays" (PDF). Energy. 83: 403–415. Bibcode:2015Ene....83..403L. doi: 10.1016/j.energy.2015.02.038 .[ permanent dead link ]
  26. ↑ "Norske oppfinneres turbinteknologi kan bli brukt i britisk tidevannseventyr". Teknisk Ukeblad . 14 January 2017. Archived from the original on 15 January 2017. Retrieved 15 January 2017.
  27. ↑ "Archived copy" (PDF). Archived (PDF) from the original on 2017-01-18. Retrieved 2017-01-15.{{cite web}}: CS1 maint: archived copy as title (link)
  28. ↑ "Tidal Lagoon May Be Cheaper Than Hinkley, Government Report Says". Bloomberg.com. 2017-01-12. Archived from the original on 2017-01-16. Retrieved 2017-01-15.
  29. ↑ Deign, Jason (20 October 2020). "New York City Is About to Get an Injection of Tidal Power. Is This Time Different?". Greentech Media. Archived from the original on 22 October 2020. Retrieved 22 October 2020.
  30. ↑ L'Usine marémotrice de la Rance Archived April 8, 2005, at the Wayback Machine
  31. 1 2 "Hunt for African Projects". Newsworld.co.kr. Archived from the original on 2011-07-19. Retrieved 2011-04-05.
  32. ↑ "Tidal power plant nears completion". yonhapnews.co.kr. Archived from the original on 2012-04-25.
  33. ↑ "China Endorses 300 MW Ocean Energy Project". Renewableenergyworld.com. 2 November 2004. Archived from the original on 2012-07-15. Retrieved 2011-04-05.
  34. ↑ "Race Rocks Demonstration Project". Cleancurrent.com. Archived from the original on 2008-07-05. Retrieved 2011-04-05.
  35. ↑ "Tidal Energy, Ocean Energy". Racerocks.com. Archived from the original on 2011-06-12. Retrieved 2011-04-05.
  36. ↑ "Tidal Energy Turbine Removal". Race Rocks Ecological Reserve- Marine mammals, seabirds. 2011-09-18. Retrieved 2018-09-09.
  37. ↑ "Information for media inquiries". Cleancurrent.com. 2009-11-13. Archived from the original on 2007-06-03. Retrieved 2011-04-05.
  38. ↑ Korea's first tidal power plant built in Uldolmok, Jindo [ dead link ]
  39. ↑ "Tidal energy system on full power". BBC News. December 18, 2008. Archived from the original on August 26, 2010. Retrieved March 26, 2010.
  40. ↑ "Strangford tidal energy turbine to be removed". BBC News. 2016-01-27. Retrieved 2024-10-12.
  41. ↑ "Tidal Power in South Korea". SAVE International. 2011-06-29. Retrieved 2021-10-11.
  42. ↑ $ 3-B tidal power plant proposed near Korean islands
  43. ↑ "Islay to get major tidal power scheme". BBC. March 17, 2011. Archived from the original on March 18, 2011. Retrieved 2011-03-19.
  44. ↑ "Islay project to produce Scotch whisky by tidal power". Scottish Construction Now. 2021-02-22. Retrieved 2023-12-18.
  45. ↑ "India plans Asian tidal power first". BBC News. January 18, 2011. Archived from the original on January 19, 2011.
  46. ↑ "India's tidal power potential hampered by high costs and environmental risks". Mongabay-India. 2021-08-20. Retrieved 2021-10-11.
  47. ↑ "1st tidal power delivered to US grid off Maine" Archived September 16, 2012, at the Wayback Machine , CBS MoneyWatch, September 14, 2012
  48. ↑ "Turbines Off NYC East River Will Create Enough Energy to Power 9,500 Homes". U.S. Department of Energy. Archived from the original on 11 February 2012. Retrieved 13 February 2012.
  49. ↑ "Scotland unveils world's largest tidal stream power project". Financial Times. 12 September 2016. Archived from the original on 2016-12-02. Retrieved 2016-12-01.
  50. ↑ "MeyGen". SAE Renewables. Retrieved 2023-12-18.
  51. ↑ "£1.3bn Swansea Bay tidal lagoon project thrown out". BBC News website. 25 June 2018. Retrieved 27 May 2022.
  52. ↑ "Mersey Tidal - Liverpool City Region Combined Authority - Citizen Space". Liverpool City Region Combined Authority. 2024-09-25. Archived from the original on 2024-09-25. Retrieved 2024-09-25.
  53. ↑ Maksumic, Zerina (2024-09-05). "Industry welcomes boost to tidal stream projects following latest UK renewables auction results". Offshore Energy. Retrieved 2024-10-12.
  54. ↑ "Tidal Energy Technology Brief" (PDF). International Renewable Energy Agency. Archived (PDF) from the original on 22 November 2015. Retrieved 16 October 2015.
  55. ↑ Kaddoura, Mohamad; Tivander, Johan; Molander, Sverker (2020). "life cycle assessment of electricity generation from an array of subsea tidal kite prototypes". Energies. 13 (2): 456. doi: 10.3390/en13020456 .
  56. ↑ "Tethys". Tethys. PNNL.
  57. ↑ Li, X.; Li, M.; Amoudry, L. O.; Ramirez-Mendoza, R.; Thorne, P. D.; Song, Q.; Zheng, P.; Simmons, S. M.; Jordan, L. -B.; McLelland, S. J. (2019-11-25). "Three-dimensional modelling of suspended sediment transport in the far wake of tidal stream turbines" (PDF). Renewable Energy. 151: 956–965. doi: 10.1016/j.renene.2019.11.096 .
  58. ↑ Martin-Short, R.; Hill, J.; Kramer, S. C.; Avdis, A.; Allison, P. A.; Piggott, M. D. (2015-04-01). "Tidal resource extraction in the Pentland Firth, UK: Potential impacts on flow regime and sediment transport in the Inner Sound of Stroma". Renewable Energy. 76: 596–607. Bibcode:2015REne...76..596M. doi: 10.1016/j.renene.2014.11.079 . hdl: 10044/1/40674 .
  59. 1 2 3 "Tethys". Archived from the original on 2014-05-25.
  60. ↑ "Whale still drawing crowds at N.S. river". The Globe and Mail. Archived from the original on 2016-03-04.
  61. ↑ Hernandez-Sanchez, Bernadette A.; Nicholas, James; Gunawan, Budi; Miller, David A.; Bonheyo, George T.; Presuel-Moreno, Francisco; Hughes, Scott (2019-09-01). Evaluation of composite materials for wave and current energy technologies (Report). Sandia National Lab. (SNL-NM), Albuquerque, NM (United States).
  62. ↑ Lusty, Ariel F; Murdy, Paul; Gionet-Gonzales, Julia A (2024). "Submerged Fatigue Testing of Marine Energy Advanced Materials". doi:10.13140/RG.2.2.34441.25445.{{cite journal}}: Cite journal requires |journal= (help)
  63. ↑ Polis, Hilary Jacqueline; Dreyer, Stacia Jeanne; Jenkins, Lekelia Danielle (2017-06-01). "Public Willingness to Pay and Policy Preferences for Tidal Energy Research and Development: A Study of Households in Washington State". Ecological Economics. 136: 213–225. Bibcode:2017EcoEc.136..213P. doi: 10.1016/j.ecolecon.2017.01.024 . hdl: 1773/35605 . ISSN   0921-8009.
  64. ↑ Dreyer, Stacia J.; Polis, Hilary Jacqueline; Jenkins, Lekelia Danielle (July 2017). "Changing Tides: Acceptability, support, and perceptions of tidal energy in the United States". Energy Research & Social Science. 29: 72–83. Bibcode:2017ERSS...29...72D. doi: 10.1016/j.erss.2017.04.013 .
  65. ↑ Jenkins, Lekelia Danielle; Dreyer, Stacia Jeanne; Polis, Hilary Jacqueline; Beaver, Ezra; Kowalski, Adam A.; Linder, Hannah L.; McMillin, Thomas Neal; McTiernan, Kaylie Laura; Rogier, Thea Thezin; Wiesebron, Lauren Eva (2018-12-01). "Human dimensions of tidal energy: A review of theories and frameworks". Renewable and Sustainable Energy Reviews. 97: 323–337. Bibcode:2018RSERv..97..323J. doi: 10.1016/j.rser.2018.08.036 . ISSN   1364-0321. S2CID   117167506.
  66. ↑ "Tidal Energy – Ocean Energy Council". Ocean Energy Council. Retrieved 2018-05-04.
  67. ↑ Sveinsson, Níels. "Profitability Assessment for a Tidal Power Plant at the Mouth of Hvammsfjörður, Iceland" (PDF).
  68. ↑ Johnson, Doug (18 April 2023). "As Sea Levels Rise, Tidal Power Becomes a Moving Target". Undark Magazine . Retrieved 9 May 2023.
  69. ↑ Khojasteh, Danial; Chen, Shengyang; Felder, Stefan; Glamore, William; Hashemi, M. Reza; Iglesias, Gregorio (15 January 2022). "Sea level rise changes estuarine tidal stream energy". Energy. 239: 122428. Bibcode:2022Ene...23922428K. doi:10.1016/j.energy.2021.122428. hdl: 10468/12300 . ISSN   0360-5442. S2CID   239908223.
  70. ↑ "Structural Health Monitoring in Composite Tidal energy converters". Archived from the original on 2014-03-25.

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