Product Code Database
A wind farm, also called a wind park or wind power plant,Robert Gasch, Jochen Twele (editors). Wind Power Plants: Fundamentals, Design, Construction and Operation. Springer, 2011. p. 11. is a group of in the same location used Wind power. Wind farms vary in size from a small number of turbines to several hundred wind turbines covering an extensive area. Wind farms can be either onshore or offshore.
Many of the largest operational onshore wind farms are located in China, India, and the United States. For example, the largest wind farm in the world, Gansu Wind Farm in China had a capacity of over 6,000 megawatt by 2012,Watts, Jonathan & Huang, Cecily. Winds Of Change Blow Through China As Spending On Renewable Energy Soars, The Guardian, 19 March 2012, revised on 20 March 2012. Retrieved 4 January 2012. with a goal of 20,000 MWFahey, Jonathan. In Pictures: The World's Biggest Green Energy Projects, Forbes, 9 January 2010. Retrieved 19 June 2019. by 2020. As of December 2020, the 1218 MW Hornsea Wind Farm in the UK is the largest offshore wind farm in the world. Individual wind turbine designs continue to increase in power, resulting in fewer turbines being needed for the same total output.
Because they require no fuel, wind farms have less impact on the environment than many other forms of power generation and are often referred to as a good source of green energy. Wind farms have, however, been criticised for their visual impact and impact on the landscape. Typically they need to be spread over more land than other power stations and need to be built in wild and rural areas, which can lead to "industrialization of the countryside", habitat loss, and a drop in tourism. Some critics claim that wind farms have adverse health effects, but most researchers consider these claims to be pseudoscience (see wind turbine syndrome). Wind farms can interfere with radar, although in most cases, according to the US Department of Energy, "siting and other mitigations have resolved conflicts and allowed wind projects to co-exist effectively with radar".
Mountain passes are ideal locations for wind farms under these conditions. Mountain passes channel wind, blocked by mountains, through a tunnel like pass towards areas of lower pressure and flatter land. Passes used for wind farms like the San Gorgonio Pass and Altamont Pass are known for their abundant wind resource capacity and capability for large-scale wind farms. These types of passes were the first places in the 1980s to have heavily invested large-scale wind farms after approval for wind energy development by the U.S. Bureau of Land Management. From these wind farms, developers learned much about turbulence and crowding effects of large-scale wind projects, which were previously unresearched, in the U.S. due to the lack of operational wind farms large enough to conduct these types of studies.
Usually sites are screened on the basis of a wind atlas, and validated with on-site wind measurements via long term or permanent meteorological-tower data using and Weather vane. Meteorology wind data alone is usually not sufficient for accurate siting of a large wind power project. Collection of site specific data for wind speed and direction is crucial to determining site potential in order to finance the project. Local winds are often monitored for a year or more, detailed wind maps are constructed, along with rigorous grid capability studies conducted, before any wind generators are installed.
The wind blows faster at higher altitudes because of the reduced influence of drag. The increase in velocity with altitude is most dramatic near the surface and is affected by topography, surface roughness, and upwind obstacles such as trees or buildings. At altitudes of thousands of feet/hundreds of metres above sea level, the power in the wind decreases proportional to the decrease in air density.
Many independent system operators (ISOs) in the United States such as the California ISO and Midcontinent ISO use interconnection request queues to allow developers to propose a new generation for a specific given area and grid interconnection. These request queues have both deposit costs at the time of request and ongoing costs for the studies the ISO will make for up to years after the request was submitted to ascertain the viability of the interconnection due to factors such as ATC. Larger corporations who can afford to bid the most queues will most likely have market power as to which sites with the most resource and opportunity are eventually developed. After the deadline to request a place in the queue has passed, many firms will withdraw their requests after gauging the competition in order to make back some of the deposit for each request that is determined too risky in comparison to other larger firms' requests.
Closer spacing is possible depending on the turbine model, the conditions at the site, and how the site will be operated. Airflows slow as they approach an obstacle, known as the 'blockage effect', reducing available wind power by 2% for the turbines in front of other turbines.
| + World's largest onshore wind farms | |||
| Zhang Jiakou | 21,235 | China | |
| Urat Zhongqi, Bayannur City | 2,100 | China | |
| M’Intyre & Herries Range QLD | 2,023 | Australia | |
| Markbygden Wind Farm | 2,000 | Sweden | |
| Hami Wind Farm | 2,000 | China | |
| Damao Qi, Baotou City | 1,600 | China | |
| Terra-Gen Press Release , 17 April 2012 | |||
| Hongshagang, Town, Minqin County | 1,000 | China | |
| Kailu, Tongliao | 1,000 | China | |
| Chengde | 1,000 | China | |
| Zarafara Wind Farm | 545 | Egypt | |
turbine installations in hilly or mountainous regions tend to be on ridges generally three kilometres or more inland from the nearest shoreline. This is done to exploit the topographic acceleration as the wind accelerates over a ridge. The additional wind speeds gained in this way can increase energy produced because more wind goes through the turbines. The exact position of each turbine matters, because a difference of 30 metres could potentially double output. This careful placement is referred to as 'micro-siting'.
, The Walney Wind Farm in the United Kingdom is the largest offshore wind farm in the world at 659 Megawatt, followed by the London Array (630 MW) also in the UK.
Offshore wind turbines are less obtrusive than turbines on land, as their apparent size and noise is mitigated by distance. Because water has less surface roughness than land (especially deeper water), the average wind speed is usually considerably higher over open water. (utilisation rates) are considerably higher than for onshore locations.
The province of Ontario, Canada is pursuing several proposed locations in the Great Lakes, including the suspended Offshore wind development hits a snag in Ontario Alberta Oil Magazine, April 2011. Retrieved 29 September 2011. Trillium Power Wind 1 approximately 20 km from shore and over 400 MW in size. Other Canadian projects include one on the Pacific west coast. In 2010, there were no offshore wind farms in the United States, but projects were under development in wind-rich areas of the East Coast, Great Lakes, and Pacific coast; and in late 2016 the Block Island Wind Farm was commissioned.'s Net Zero by 2050 pathway to combat climate change.]]Installation and service / maintenance of off-shore wind farms are a challenge for technology and economic operation of a wind farm. , there are 20 Jackup rig for lifting components, but few can lift sizes above 5 MW. Service vessels have to be operated nearly 24/7 (availability higher than 80% of time) to get sufficient amortisation from the wind turbines. Therefore, special fast service vehicles for installation (like Wind Turbine Shuttle) as well as for maintenance (including heave compensation and heave compensated working platforms to allow the service staff to enter the wind turbine also at difficult weather conditions) are required. So-called inertial and optical based Ship Stabilization and Motion Control systems (iSSMC) are used for that.
| + The world's 10 largest offshore wind farms | |||||
| United Kingdom | |||||
| Triton Knoll | 857 | United Kingdom | 90 × Vestas V164 9.5 MW | 2021 | |
| Jiangsu Qidong | 802 | China | 134 × (seven different models from four domestic manufacturers) | 2021 | |
| Borssele I & II | 752 | Netherlands | 94 × Siemens Gamesa 8MW | 2020 | |
| Borssele III & IV | 731.5 | Netherlands | 77 × Vestas V164 9.5MW | 2021 | |
| East Anglia Array | 714 | United Kingdom | 102 × Siemens Gamesa 7MW | 2020 | |
| London Array | 630 | United Kingdom | 175 × Siemens Gamesa SWT-3.6-120 | 2013 | Wittrup, Sanne. First foundation Ing.dk, 8 March 2011. Accessed: 8 March 2011. |
| Kriegers Flak | 605 | Denmark | 72 × Siemens Gamesa SWT-8.4-167 | 2021 | |
| Gemini Wind Farm | 600 | Netherlands | 150 × Siemens Gamesa SWT-4.0 | 2017 | |
Airborne wind farms have been envisaged. Such wind farms are a group of airborne wind energy systems located close to each other connected to the grid at the same point. AWES Farm Density Airborne Wind Energy Labs, March 2014. Retrieved 20 March 2014.
Wind farms consisting of diverse wind turbines have been proposed in order to efficiently use wider ranges of wind speeds. Such wind farms are proposed to be projected under two criteria: maximization of the energy produced by the farm and minimization of its costs.
At the end of 2009, wind power in China accounted for 25.1 (GW) of electricity generating capacity, and China has identified wind power as a key growth component of the country's economy. With its large land mass and long coastline, China has exceptional wind resources. Researchers from Harvard and Tsinghua University have found that China could meet all of their electricity demands from wind power by 2030., China]]By the end of 2008, at least 15 Chinese companies were commercially producing wind turbines and several dozen more were producing components. Turbine sizes of 1.5 MW to 3 MW became common. Leading wind power companies in China were Goldwind, Dongfang Electric, and Sinovel along with most major foreign wind turbine manufacturers. China also increased production of small-scale wind turbines to about 80,000 turbines (80 MW) in 2008. Through all these developments, the Chinese wind industry appeared unaffected by the 2008 financial crisis, according to industry observers.
According to the Global Wind Energy Council, the development of wind energy in China, in terms of scale and rhythm, is unparalleled in the world. The National People's Congress permanent committee passed a law that requires the Chinese energy companies to purchase all the electricity produced by the renewable energy sector.
An important limiting factor of wind power is variable power generated by wind farms. In most locations the wind blows only part of the time, which means that there has to be back-up capacity of dispatchable generation capacity to cover periods that the wind is not blowing. To address this issue it has been proposed to create a "supergrid" to connect national grids together across western Europe, ranging from Denmark across the southern North Sea to England and the Celtic Sea to Ireland, and further south to France and Spain especially in Higueruela which was for some time the biggest wind farm in the world. The idea is that by the time a low pressure area has moved away from Denmark to the Baltic Sea the next low appears off the coast of Ireland. Therefore, while it is true that the wind is not blowing everywhere all of the time, it will tend to be blowing somewhere.
In July 2022, Seagreen, the world's deepest fixed-bottom wind farm, became operative. Located 26 miles off the Angus coastline, in Scotland, it has 114 turbines that generate 1.1 gigawatts (GW) of electricity.
Currently four wind farms are operational (Fauji Fertilizer 49.5 MW (subsidiary of Fauji Foundation), Three Gorges 49.5 MW, Zorlu Energy Pakistan 56 MW, Sapphire Wind Power Company Limited 52.6 MW) and six are under construction phase ( Master Wind Energy Limited 52.6 MW, Sachal Energy Development Limited 49.5 MW, Yunus Energy Limited 49.5 MW, Gul Energy 49.5 MW, Metro Energy 49.5 MW, Tapal Energy) and were expected to achieve COD in 2017.
In the Gharo wind corridor, two wind farms (Foundation Energy 1 & II each 49.5 MW) are operational while two wind farms Tenaga Generasi Limited 49.5 MW and HydroChina Dawood Power Pvt. Limited 49.5 are under construction and expected to achieve COD in 2017.
According to a USAID report, Pakistan has the potential of producing 150,000 megawatts of wind energy, of which the Sindh corridor can produce 40,000 megawatts.
The wind farm uses 20 units of high Vestas V82 1.65 MW wind turbines, arranged on a single row stretching along a nine-kilometre shoreline off Bangui Bay, facing the South China Sea.
Phase I of the NorthWind power project in Bangui Bay consists of 15 wind turbines, each capable of producing electricity up to a maximum capacity of 1.65 MW, for a total of 24.75 MW. The 15 on-shore turbines are spaced apart, each high, with long blades, with a rotor diameter of and a wind swept area of . Phase II was completed in August 2008, and added 5 more wind turbines with the same capacity, and brought the total capacity to 33 MW. All 20 turbines describes a graceful arc reflecting the shoreline of Bangui Bay.
Adjacent municipalities of Burgos and Pagudpud followed with 50 and 27 wind turbines with a capacity of 3 MW each for a Total of 150 MW and 81 MW respectively.
Two other wind farms were built outside of Ilocos Norte, the Pililla Wind Farm in Rizal and the Mindoro Wind Farm near Puerto Galera in Oriental Mindoro.
Most future wind farms in South Africa are earmarked for locations along the Eastern Cape coastline. Eskom has constructed one small scale prototype windfarm at Klipheuwel in the Western Cape and another demonstrator site is near Darling with phase 1 completed. The first commercial wind farm, Coega Wind Farm in Port Elisabeth, was developed by the Belgian company Electrawinds.
Growth in 2008 channeled some $17 billion into the economy, positioning wind power as one of the leading sources of new power generation in the country, along with natural gas. Wind projects completed in 2008 accounted for about 42% of the entire new power-producing capacity added in the U.S. during the year.
Texas, with 27,036 MW of capacity, has the most installed wind power capacity of any U.S. state, followed by Iowa with 8,965 MW and Oklahoma with 8,072 MW. Iowa is the leading state in terms of wind energy accounting for nearly 40% of total energy production in 2019. The Alta Wind Energy Center (1,020 MW) in California is the nation's largest wind farm in terms of capacity. Altamont Pass Wind Farm is the largest wind farm in the U.S. in terms of the number of individual turbines. Encyclopedia of Earth Altamont Pass, California.
At the end of 2019, about 114,000 people were employed in the U.S. wind industry, and GE Energy was the largest domestic wind turbine manufacturer.American Wind Energy Association (2009). Annual Wind Industry Report, Year Ending 2008 pp. 9–10. In 2018, US wind power provided enough electricity to power approximately 25 million homes, avoiding the emissions of 200 million tons of carbon.
In the early 1980s, a plan was developed in the USSR to build wind power plants to provide energy to autonomous facilities in the Far North (the construction of which was to be carried out by military builders)Энергию ветра — в дело // журнал "Тыл и снабжение советских вооружённых сил", № 12, 1983. Later, an experimental farm with several wind turbines was built on the bank of the river Desna in the Vyshhorod Raion of the Kiev oblastВладимир Устинюк. Пейзаж с ветряками // журнал "Vokrug sveta", № 12, 1984. стр.38-40.
In a 2009 report about "Rural Wind Farms", a Standing Committee of the Parliament of New South Wales, Australia, recommended a minimum setback of two kilometres between wind turbines and neighboring houses (which can be waived by the affected neighbor) as a precautionary approach.General Purpose Standing Committee No. 5, Parliament of New South Wales (16 December 2009). "Final Report, Rural Wind Farms" .
A 2014 paper suggests that the 'Wind Turbine Syndrome' is mainly caused by the nocebo effect and other psychological mechanisms. Australian science magazine Cosmos states that although the symptoms are real for those who suffer from the condition, doctors need to first eliminate known causes (such as pre-existing cancers or thyroid disease) before reaching definitive conclusions with the caveat that new technologies often bring new, previously unknown health risks.
The intermittent nature of wind power can pose complications for maintaining a stable power grid when wind farms provide a large percentage of electricity in any one region. Power-eng.com: "Intermitten dinw problems and a possible solution"
However wind farms are more resistant to military attack than thermal power plants as many missiles are needed to destroy them not just one.
Some very long range radars are not affected by wind farms.
A mobile radar system, the Lockheed Martin TPS-77, can distinguish between aircraft and wind turbines, and more than 170 TPS-77 radars are in use around the world. Outdated.
The United States Federal Aviation Administration advises aircraft without position-reporting technologies such as transponders to avoid flight within at all altitudes from wind turbine farms.
In another study, an analysis carried out on maize and soybean crops in the central areas of the United States noted that the microclimate generated by wind turbines improves crops as it prevents the late spring and early autumn frosts, and also reduces the action of pathogenic fungi that grow on the leaves. Even at the height of summer heat, the lowering of 2.5–3 degrees above the crops due to turbulence caused by the blades can make a difference for the cultivation of corn.Takle, Gene and Julie Lundquist. Wind turbines on farmland may benefit crops Ames Laboratory, 16 December 2010. Retrieved 10 March 2011.
Europe
In 2011 the European Union had a total installed wind capacity of 93,957 MW. Germany had the third-largest capacity in the world (after China and the United States), with an installed capacity of 29,060 MW at the end of 2011. Spain had 21,674 MW, and Italy and France each had between 6,000 and 7,000 MW. By January 2014, the UK installed capacity was 10,495 MW. But energy production can be different from capacity – in 2010, Spain had the highest European wind power production with 43 TWh compared to Germany's 35 TWh. In addition to the 'London Array', an off-shore wind farm in the Thames Estuary in the United Kingdom, with a capacity of 630 MW (the world's largest off-shore wind farm when built), other large wind farms in Europe include Fântânele-Cogealac Wind Farm near Constanța, Romania with 600 MW capacity, and Whitelee Wind Farm near Glasgow, Scotland which has a total capacity of 539 MW., Spain]]
India
India has the fifth largest installed wind power capacity in the world. As of March 2025, the installed capacity of wind power was 50037.82 megawatts mainly spread across Tamil Nadu state (11739.91 MW) and Gujarat state (12677.48 MW). Wind power accounts nearly 8.5% of India's total installed power generation capacity, and it generates 1.6% of the country's power.
Japan
Jordan
The 117 MW Tafila Wind Farm in Jordan was inaugurated in December 2015, and is the first large scale wind farm project in the region.
Morocco
Morocco has undertaken a vast wind energy program, to support the development of renewable energy and energy efficiency in the country. The Moroccan Integrated Wind Energy Project, spanning over a period of 10 years with a total investment estimated at $3.25 billion, will enable the country to bring the installed capacity, from wind energy, from 280 MW in 2010 to 2000 MW in 2020.
Pakistan
Pakistan has wind corridors in Jhimpir, Gharo and Keti Bundar in Sindh province and is currently developing wind power plants in Jhimpir and Mirpur Sakro (District Thatta). The government of Pakistan decided to develop wind power energy sources due to problems supplying energy to the southern coastal regions of Sindh and Balochistan. The Zorlu Energy Putin Power Plant is the first wind power plant in Pakistan. The wind farm is being developed in Jhimpir, by Zorlu Energy Pakistan the local subsidiary of a Turkish company. The total cost of the project is $136 million.3 Completed in 2012, it has a total capacity of around 56MW. Fauji Fertilizer Company Energy Limited, has built a 49.5 MW wind Energy Farm at Jhimpir. Contract of supply of mechanical design was awarded to Nordex and Descon Engineering Limited. Nordex is a German wind turbine manufacturer. In the end of 2011 49.6 MW was expected to be completed. The Pakistani government also issued a Letter Of Interest in a 100 MW Wind power plant to FFCEL. The Pakistani government had plans to achieve electric power generation of up to 2500 MW by the end of 2015 from wind energy to bring down an energy shortage.
Philippines
The Philippines has the first windfarm in Southeast Asia. Located in the northern part of the country's biggest island, Luzon, alongside the seashore of Bangui, Ilocos Norte.
Sri Lanka
Sri Lanka has received funding from the Asian Development Bank amounting to $300 million to invest in renewable energies. From this funding as well as $80 million from the Sri Lankan Government and $60 million from France's Agence Française de Développement, Sri Lanka was expected to build two 100MW wind farms from 2017 due to be completed by late 2020 in northern Sri Lanka.
South Africa
As of September 2015, a number of sizable wind farms have been constructed in South Africa mostly in the Western Cape region. These include the 100 MW Sere Wind Farm and the 138 MW Gouda Wind Facility.
United States
U.S. wind power installed capacity in September 2019 exceeded 100,125 MW and supplies 6.94% of the nation's electricity. The majority of wind farms in the United States are located in the Great Plains, with slow expansion into other regions of the country.
USSR
In the USSR, plans to use wind energy were made in the early 1920s (the use of wind energy for irrigation systems in the Baku region was mentioned in a letter from Vladimir Lenin in April 1921). The first wind power station in the USSR was built in 1931 in Balaklava. After the Axis invasion against the USSR it was destroyed during the occupation of the Crimean Peninsula by Axis powers invadersА. Кучушев. Энергия ветра // газета "Izvestia", № 212 (19582) от 8 сентября 1980. In 1951, the Ural Electromechanical Plant began mass production of standard wind power stations for collective farmsВетроэлектростанции для колхозных радиоузлов // газета "Известия", № 104 (10562) от 6 мая 1951 стр.1. In the period 1945-1970, more than 40 thousand wind turbines were made in the USSR, most of them were installed in rural areas on state farms and collective farmsВетроэнергетика // Большая Советская Энциклопедия / под ред. А. М. Прохорова. 3-е изд. Том 4. М., «Советская энциклопедия», 1971..
Impact on environment and landscape
Health impact
There have been multiple scientific, peer-reviewed studies into wind farm noise, which have concluded that infrasound from wind farms is not a hazard to human health and there is no verifiable evidence for 'Wind Turbine Syndrome' causing vibroacoustic disease, although some suggest further research might still be useful. 'Wind Energy – The Facts', p. 1.
Effect on power grid
Utility-scale wind farms must have access to transmission lines to transport energy. The wind farm developer may be obliged to install extra equipment or control systems in the wind farm to meet the technical standards set by the operator of a transmission line.
Ground radar interference
Wind farms can interfere with ground radar systems used for military, Weather radar and air traffic control. The large, rapidly moving blades of the turbines can return signals to the radar that can be mistaken as an aircraft or weather pattern. Wind farm interference showing up on Doppler radar National Weather Service. Retrieved 9 February 2011. Actual aircraft and weather patterns around wind farms can be accurately detected, as there is no fundamental physical constraint preventing that, but aging radar infrastructure is significantly challenged with the task.Brenner, Michael et al. Wind Farms and Radar Federation of American Scientists, January 2008. Retrieved 9 February 2011.Greenemeier, Larry. Wind turbine or airplane? New radar could cut through the signal clutter Scientific American, 3 September 2010. Retrieved 9 February 2011. The US military is using wind turbines on some bases, including Barstow near the radar test facility. About the R-2508 Airspace United States Air Force. Retrieved 9 February 2011.Hayes, Keith. MCLB Barstow wind turbine a Marine Corps first United States Marine Corps, 27 March 2009. Retrieved 9 February 2011.
Effects
The level of interference is a function of the signal processors used within the radar, the speed of the aircraft and the relative orientation of wind turbines/aircraft with respect to the radar. An aircraft flying above the wind farm's turning blades could become impossible to detect because the blade tips can be moving at nearly aircraft velocity. Studies are currently being performed to determine the level of this interference and will be used in future site planning. Issues include masking (shadowing), clutter (noise), and signal alteration. Radars and radio signals Wind Energy Facts. Retrieved 9 February 2011. Radar issues have stalled as much as 10,000 MW of projects in the USA.Levitan, David. Wind turbines cause radar cone of silence IEEE, 9 February 2010. Retrieved 9 February 2011.
Mitigation
Permanent problem solving include a non-initiation window to hide the turbines while still tracking aircraft over the wind farm, and a similar method mitigates the false returns.P. Jago, N. Taylor. Wind turbines and aviation interests – European experience and practice pages 10–13, Stasys, 2002. Retrieved 9 February 2011. England's Newcastle Airport is using a short-term mitigation; to "blank" the turbines on the radar map with a software patch.Learmount, David. Newcastle airport radar develops fix for wind turbine interference Flight Global, 17 November 2010. Retrieved 9 February 2011. Wind turbine blades using stealth technology are being developed to mitigate radar reflection problems for aviation. QinetiQ and Vestas test 'stealth technology' for wind turbines Renewable Energy Focus, 26 October 2009. Retrieved 22 September 2010. 'Stealth' wind turbine blade may end radar problem Reuters via Cnet, 27 January 2010. Retrieved 22 September 2010.Fairly, Peter. Stealth-Mode Wind Turbines Technology Review, 2 November 2009. Retrieved 22 September 2010.Appleton, Steve. Stealth blades – a progress report QinetiQ. Retrieved 22 September 2010. As well as stealth windfarms, the future development of infill radar systems could filter out the turbine interference.
Radio reception interference
There are also reports of negative effects on radio and television reception in wind farm communities. Potential solutions include predictive interference modelling as a component of site selection.
Impact on agriculture
A 2010 study found that in the immediate vicinity of wind farms, the climate is cooler during the day and slightly warmer during the night than the surrounding areas due to the turbulence generated by the blades.Roy, Somnath Baidya. Impacts of wind farms on surface air temperatures Proceedings of the National Academy of Sciences, 4 October 2010. Retrieved 10 March 2011.
See also
External links
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