Introduction Wtt

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SEMINAR REPORT

WIND TURBINE TECHNOLOGY IN INDIA

By,

SANDEEP S

ETAHECH039

29-10-2010



CHAPTER 1

1.1 INTRODUCTION

Wind energy is a renewable form of energy resource which is plentiful,widely distributed, clean, and produces no greenhouse gas emissions during operation.Because of these reasons wind energy has always been a reliable form of energy for ages.Wind power technology dates back many centuries. There are historical claims that windmachines which harness the power of the wind date back beyond the time of the ancient

Egyptians. Hero of Alexandria used a simple windmill to power an organ whilst theBabylonian emperor, Hammurabi, used windmills for an ambitious irrigation project as early

as the 17th century BC. The Persians built windmills in the 7th century AD for milling andirrigation and rustic mills similar to these early vertical axis designs can still be found in theregion today. In Europe the first windmills were seen much later, probably having beenintroduced by the English on their return from the crusades in the Middle East or possiblytransferred to Southern Europe by the Muslims after their conquest of the Iberian Peninsula.It was in Europe that much of the subsequent technical development took place. By the late

part of the 13th century the typical µEuropean windmill¶ had been developed and this becamethe norm until further developments were introduced during the 18th century. At the end of the 19th century there were more than 30,000 windmills in Europe, used primarily for themilling of grain and water pumping.

Modern wind generatorsThe first wind powered electricity was produced by a machine built by Charles F.

Brush in Cleveland, Ohio in 1888. It had a rated power of 12 kW (direct current - dc). Directcurrent electricity production continued in the form of small scale, stand-alone systems until

the 1930's when the first large scale AC turbine was constructed in the USA. There was thena general lull in interest until the 1970's when the fuel crises sparked a revival in research anddevelopment work in North America and Europe. Modern wind turbine generators are highlysophisticated machines, taking full advantage of state-of-the-art technology, led byimprovements in aerodynamic and structural design, materials technology and mechanical,electrical and control engineering and capable of producing several megawatts of electricity.During the 1980's installed capacity costs dropped considerably and wind power has becomean economically attractive option for commercial electricity generation. Large wind farms or wind power stations have become a common sight in many western countries. In 2001Denmark alone had 2000 Megawatts of electricity generating capacity from more than 5,700wind turbines, representing 14% of their national electricity consumption. Wind is a clean,safe, renewable form of energy.



To a lesser degree, there has been a parallel development in small-scale wind generators for supplying electricity for battery charging, for stand-alone applications and for connection tosmall grids. Table shows the classification system for wind turbines.

Scale Rotor Diameter Power Rating

Micro <3 m 50 W to 2 kWSmall 3 m to 12 m 2 kW to 40 kW

Medium 12 m to 45 m 40 kW to 999kW

Large >46 m >1 MW



CHAPTER 2

2.1 Working of Wind TurbineA wind turbine is a machine that converts the kinetic energy in wind into mechanical

energy. If the mechanical energy is used directly by machinery, such as a pump or grindingstones, the machine is usually called a windmill. If the mechanical energy is converted toelectricity, the machine is called a wind generator, or more commonly a wind turbine (windenergy converter WEC).

A wind turbine works the opposite of a fan. Instead of using electricity to make wind,like a fan, wind turbines use wind to make electricity. The wind turns the blades, which spin ashaft, which connects to a generator and makes electricity. Utility-scale turbines range in sizefrom 50 to 750 kilowatts. Single small turbines, below 50 kilowatts, are used for homes,telecommunications dishes, or water pumping.

The various components of a wind turbine are given below:

Anemometer: Measures the wind speed and transmits wind speed data to thecontroller.

Blades: Most turbines have either two or three blades. Wind blowing over the blades causes the blades to "lift" and rotate.

Brake: A disc brake which can be applied mechanically, electrically, or hydraulically to stop the rotor in emergencies.



Controller: The controller starts up the machine at wind speeds of about 8 to 16miles per hour (mph) and shuts off the machine at about 65 mph. Turbines cannot

operate at wind speeds above about 65 mph because their generators could overheat.

Gear box: Gears connect the low-speed shaft to the high-speed shaft and increasethe rotational speeds from about 30 to 60 rotations per minute (rpm) to about 1200

to 1500 rpm, the rotational speed required by most generators to produce electricity.The gear box is a costly (and heavy) part of the wind turbine and engineers areexploring "direct-drive" generators that operate at lower rotational speeds and don'tneed gear boxes.

Generator: Usually an off-the-shelf induction generator that produces 60-cycle ACelectricity.

High-speed shaft: Drives the generator.

Low-speed shaft: The rotor turns the low-speed shaft at about 30 to 60 rotations per minute.

Nacelle: The rotor attaches to the nacelle, which sits atop the tower and includes the

gear box, low- and high-speed shafts, generator, controller, and brake. A cover protects the components inside the nacelle. Some nacelles are large enough for a

technician to stand inside while working.

Pitch: Blades are turned, or pitched, out of the wind to keep the rotor from turningin winds that are too high or too low to produce electricity.

Rotor: The blades and the hub together are called the rotor.

Tower: Towers are made from tubular steel (shown here) or steel lattice. Becausewind speed increases with height, taller towers enable turbines to capture moreenergy and generate more electricity.

Wind direction: This is an "upwind" turbine, so-called because it operates facinginto the wind. Other turbines are designed to run "downwind", facing away from thewind.

Wind vane: Measures wind direction and communicates with the yaw drive toorient the turbine properly with respect to the wind.

Yaw drive: Upwind turbines face into the wind; the yaw drive is used to keep the

rotor facing into the wind as the wind direction changes. Downwind turbines don'trequire a yaw drive, the wind blows the rotor downwind.

Yaw motor: Powers the yaw drive.



CHAPTER 3

3.1 Classifications of wind turbinesWind turbines can be separated into two types based on the axis about which the

turbine rotates. They are horizontal axis wind turbines and vertical axis wind turbines.Turbines that rotate around a horizontal axis are more common. Vertical-axis turbines are lessfrequently used.

Wind turbines can also be classified by the location in which they are to be used. Onshore,offshore, or even aerial wind turbines have unique design characteristics.

3.1.1 Horizontal axis Horizontal-axis wind turbines (HAWT) have the main rotor shaft and electrical

generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a servomotor. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable for generating electricity.

Since a tower produces turbulence behind it, the turbine is usually pointed upwind of thetower. Turbine blades are made stiff to prevent the blades from being pushed into the tower

by high winds. Additionally, the blades are placed a considerable distance in front of thetower and are sometimes tilted up a small amount.

Downwind machines have been built, despite the problem of turbulence, because they don'tneed an additional mechanism for keeping them in line with the wind, and because in highwinds, the blades can be allowed to bend which reduces their swept area and thus their windresistance. Because turbulence leads to fatigue failures and reliability is so important, most

HAWTs are upwind machines.

There are several types of HAWT:

These four- (or more) bladed squat structures, usually with wooden shutters or fabric sails,were developed in Europe. These windmills were pointed into the wind manually or via a tail-fan and were typically used to grind grain. In the Netherlands they were also used to pumpwater from low-lying land, and were instrumental in keeping its polders dry. Windmills werealso located throughout the USA, especially in the North-eastern region.

3.1.1.1 Modern Rural Windmills These windmills, invented in 1876 by Griffiths Bros and Co (Australia), were used by

Australian and later American farmers to pump water and to generate electricity. Theytypically had many blades, operated at tip speed ratios (defined below) not better than one,and had good starting torque. Some had small direct-current generators used to charge storage

batteries, to provide a few lights, or to operate a radio receiver. The American ruralelectrification connected many farms to centrally-generated power and replaced individualwindmills as a primary source of farm power in the 1950's. Such devices are still used inlocations where it is too costly to bring in commercial power.



Wind turbines near Aalborg, Denmark

A standard doorway can be seen at the base of the pylon for scale

3.1.1.2 Common modern wind turbines

Usually three-bladed, sometimes two-bladed or even one-bladed (and counterbalanced), and pointed into the wind by computer-controlled motors. The rugged three-bladed turbine typehas been championed by Danish turbine manufacturers. These have high tip speeds of up to6x wind speed, high efficiency, and low torque ripple which contribute to good reliability.This is the type of turbine that is used commercially to produce electricity. The blades areusually coloured light gray to blend in with the clouds and range in length from 20 to 40metres (60 to 120 feet) or more.

3.1.2 Vertical axis 12 m Windmill with rotational sails in the Osijek Croatia. Vertical-axis wind turbines (or VAWTs) have the main rotor shaft running vertically. Key advantages of this arrangement arethat the generator and/or gearbox can be placed at the bottom, near the ground, so the tower doesn't need to support it, and that the turbine doesn't need to be pointed into the wind.Drawbacks are usually pulsating torque that can be produced during each revolution and dragcreated when the blade rotates into the wind. It is also difficult to mount vertical-axis turbineson towers, meaning they must operate in the often slower, more turbulent air flow near theground, resulting in lower energy extraction efficiency.

3.1.2.1 Windmill with rotational sails

This is a new invention. This windmill starts making electricity above a wind speed of 2m/s.Its sails contract and expand as the wind speed changes. This windmill has three sails of variable surface area. The speed is controlled through a magnetic rev counter that expands or contracts the sails according to wind speed. A (microprocessor type) control unit controls thesails either manually or automatically. In case of a control unit failure, strong winds wouldtear the sails, but the frame would remain intact.



3.1.2.2 Neo-AeroDynamic

This has an airfoil base designed to harness the kinetic energy of the fluid flow via anartificial current around its centre. It is differentiated from others by its capability to unitize

most of the air mass passing through redirecting it to flow over the upper chamber of theairfoils, and causing a lift force all around. It is applicable not only to wind, but also to a

variety of hydroelectric applications, including free-flow (rivers, creeks), tidal, oceaniccurrents and wave motion, via ocean wave surface currents.

30 m Darrieus wind turbine in the Magdalen Islands

3.1.2.3 Darrieus wind turbine

"Eggbeater" turbines. They have good efficiency, but produce large torque ripple and cyclicstress on the tower, which contributes to poor reliability. Also, they generally require someexternal power source, or an additional Savonius rotor, to start turning, because the startingtorque is very low. The torque ripple is reduced by using 3 or more blades which results in ahigher solidity for the rotor. Solidity is measured by blade area over the rotor area. Newer Darrieus type turbines are not held up by guy wires but have an external superstructureconnected to the top bearing.

3.1.2.4 GiromillA type of Darrieus turbine, these lift-type devices have vertical blades. The cycloturbinevarieties have variable pitch to reduce the torque pulsation and are self-starting. Theadvantages of variable pitch are: high starting torque; a wide, relatively flat torque curve; a

lower blade speed ratio; a higher coefficient of performance; more efficient operation inturbulent winds; and a lower blade speed ratio which lowers blade bending stresses. Straight,V, or curved blades may be used.

3.1.2.5 Savonius wind turbineThese are drag-type devices with two- (or more) scoops that are used in anemometers, theFlettner vents (commonly seen on bus and van roofs), and in some high-reliability low-efficiency power turbines. They always self-starting if there are at least three scoops. Theysometimes have long helical scoops to give a smooth torque. The Banesh rotor and especially



the Rahai rotor improve efficiency with blades shaped to produce significant lift as well asdrag.

3.1.2.6 Windstar turbinesThese lift-type devices made by Wind Harvest have straight, extruded aluminum blades

attached at each end to a central rotating shaft and are operated as Linear Array VortexTurbine Systems (LAVTS). Vertical-axis rotors each with their own 50-75kW generator are

placed in three to any number of rotors in linear arrays with each rotor¶s blades passing withintwo feet of its neighbor. In this configuration, the center rotors gain an increase in output andefficiency (reaching the high efficiencies of HAWTs). This increased efficiency is protectedunder patent (number 6784566) as the "vortex effect". Each rotor unit has a dual brakingsystem of pneumatic disc brakes and blade pitch. The newest Windstar LAVTS stand 50 feettall, have 1500 and 3000 square feet of swept area per rotor and are designed to be placed inthe turbulent winds within the understory of wind farms.

3.1.3 Offshore

Offshore wind turbines near Copenhagen Offshore wind development zones are generallyconsidered to be ten kilometres or more from land. Offshore wind turbines are less obtrusivethan turbines on land, as their apparent size and noise can be mitigated by distance. Because

water has less surface roughness than land (especially deeper water), the average wind speedis usually considerably higher over open water. Capacity factors (utilisation rates) are

considerably higher than for onshore and near-shore locations which allow offshore turbinesto use shorter towers, making them less visible.

In stormy areas with extended shallow continental shelves (such as Denmark), turbines are practical to install ² Denmark's wind generation provides about 25-30% of total electricitydemand in the country, with many offshore wind farms. Denmark plans to increase windenergy's contribution to as much as half of its electrical supply.

In most cases offshore environment is more expensive than onshore. Offshore towers aregenerally taller than onshore towers once the submerged height is included, and offshorefoundations are more difficult to build and more expensive. Power transmission from offshoreturbines is generally through undersea cable, which is more expensive to install than cables onland, and may use high voltage direct current operation if significant distance is to be coveredwhich then requires yet more equipment. The offshore environment can also be corrosive and

abrasive in salt water locations but locations such as the Great Lakes are in fresh water and donot have many of the issues found in the ocean or sea. Repairs and maintenance are usually

much more difficult, and generally more costly, than on onshore turbines. Offshore windturbines are outfitted with extensive corrosion protection measures like coatings and cathodic

protection however some of these measures may not be required in fresh water locations.

While there is a significant market for small land-based windmills, offshore wind turbineshave recently been and will probably continue to be the largest wind turbines in operation,

because larger turbines allow for the spread of the high fixed costs involved in offshoreoperation over a greater quantity of generation, reducing the average cost. For similar reasons,offshore wind farms tend to be quite large²often involving over 100 turbines²as opposed toonshore wind farms which can operate competitively even with much smaller installations.



There are some conceptual designs that might make use of the unique offshore environment.For example, a floating turbine might orient itself downwind of its anchor, and thus avoid the

need for a yawing mechanism. One concept for offshore turbines has them generate rain,instead of electricity. The turbines would create a fine aerosol, which is envisioned to increase

evaporation and induce rainfall, hopefully on land.

3.1.4 Near-shore Near-shore turbines are generally considered to be within a zone that is on land threekilometers of a shoreline and on water within ten kilometers of land. Wind speeds in thesezones share wind speed characteristics of both onshore wind and offshore wind. Issues thatare shared within near-shore wind development zones are ornithological (including birdmigration and nesting), aquatic habitat, transportation (including shipping and boating) andvisual aesthetics.

Sea shores also tend to be windy areas and good sites for turbine installation, because a primary source of wind is convection from the differential heating and cooling of land and sea

over the course of day and night. Winds at sea level carry somewhat more energy than winds

of the same speed in mountainous areas because the air at sea level is denser.

Near-shore wind farm sitting can sometimes be highly controversial as coastal sites are often

picturesque and environmentally sensitive (for instance, having substantial bird life).

3.1.5 Onshore

Wind turbines near Walla Walla in Washington Onshore turbine installations in hilly or mountainous regions tend to be on ridgelines generally three kilometres or more inland fromthe nearest shoreline. This is done to exploit the topographic acceleration where the hill or ridge causes the wind to accelerate as it is forced over it. The additional wind speeds gained inthis way make large differences to the amount of energy that is produced. Great attentionmust be paid to the exact positions of the turbines (a process known as micro-sitting) becausea difference of 30 m can sometimes mean a doubling in output. Local winds are oftenmonitored for a year or more with anemometers and detailed wind maps constructed beforewind generators are installed.

For smaller installations where such data collection is too expensive or time consuming, thenormal way of prospecting for wind-power sites is to directly look for trees or vegetation that

are permanently "cast" or deformed by the prevailing winds. Another way is to use a wind-speed survey map or historical data from a nearby meteorological station, although these

methods are less reliable.

Wind farm sitting can sometimes be controversial, particularly as the hilltop, often coastalsites preferred are often picturesque and environmentally sensitive (for instance, having

substantial bird life). Local residents in a number of potential sites have strongly opposed theinstallation of wind farms, and political support has resulted in the blocking of construction of

some installations.

3.2.1 Advantages of vertical wind turbines

y Easier to maintain because most of their moving parts are located near the ground.This is due to the vertical wind turbine¶s shape. The airfoils or rotor blades are



3.2.4 Disadvantages of horizontal wind turbines

y HAWTs have difficulty operating in near ground, turbulent winds because their yawand blade bearing need smoother, more laminar wind flows.

y The tall towers and long blades (up to 180 feet long) are difficult to transport on thesea and on land. Transportation can now cost 20% of equipment costs. Tall HAWTs

are difficult to install, needing very tall and expensive cranes and skilled operators.

y Supply of HAWTs is less than demand and between 2004 and 2006, turbine pricesincreased up to 60%. At the end of 2006, all major manufacturers were booked upwith orders through 2008. The FAA has raised concerns about tall HAWTs effects onradar in proximity to air force bases. Their height can create local opposition based onimpacts to viewsheds.

y Offshore towers can be a navigation problem and must be installed in shallow seas.HAWTs can't be floated on barges.

y Downwind variants suffer from fatigue and structural failure caused byturbulence.

y Horizontal-axis wind turbine aerodynamics

y The aerodynamics of a horizontal-axis wind turbine are complex. The air flow at the

blades is not the same as the airflow far away from the turbine. The very nature of theway in which energy is extracted from the air also causes air to be deflected by the

turbine. In addition, the aerodynamics of a wind turbine at the rotor surface includeseffects that are rarely seen in other aerodynamic fields.



CHAPTER 4

4.1 Wind Power generation in India

The development of wind power in India began in the 1990s, and has significantly increasedin the last few years. Although a relative newcomer to the wind industry compared withDenmark or the US, India has the fifth largest installed wind power capacity in the world.

As of 31 October 2009 the installed capacity of wind power in India was 11806.69 MW,mainly spread across Tamil Nadu (4900.765 MW), Maharashtra (1945.25 MW), Gujarat(1580.61 MW), Karnataka (1350.23 MW), Rajasthan (745.5 MW), Madhya Pradesh (212.8MW), Andhra Pradesh (132.45 MW), Kerala (46.5 MW), Orissa (2MW), West Bengal (1.1MW) and other states (3.20 MW). It is estimated that 6,000 MW of additional wind power capacity will be installed in India by 2012. Wind power accounts for 6% of India's totalinstalled power capacity, and it generates 1.6% of the country's power.

India is the world's fifth largest wind power producer, with an annual power production of 8,896 MW. The worldwide installed capacity of wind power reached 157,899 MW by the endof 2009. USA (35,159 MW), Germany (25,777 MW), Spain (19,149 MW) and China (25,104MW) are ahead of India in fifth position. The short gestation periods for installing windturbines, and the increasing reliability and performance of wind energy machines has madewind power a favoured choice for capacity addition in India.

Suzlon, as Indian-owned company, emerged on the global scene in the past decade, and by2006 had captured almost 7.7 percent of market share in global wind turbine sales. Suzlon iscurrently the leading manufacturer of wind turbines for the Indian market, holding some 52

percent of market share in India. Suzlon¶s success has made India the developing country

leader in advanced wind turbine technology.

4.2 State-level wind power

There is a growing wind energy installation in number of states across India.

Tamil Nadu (4889.765 MW)

Tamil Nadu is the state with the most wind generating capacity: 4889.765 MW at the end of March 2010. Not far from Aralvaimozhi, the Muppandal wind farm, the largest in thesubcontinent, is located near the once impoverished village of Muppandal, supplying thevillagers with electricity for work. The village had been selected as the showcase for India's

$2 billion clean energy program which provides foreign companies with tax breaks for establishing fields of wind turbines in the area. In February 2009, Shriram EPC bagged INR 700 million contracts for setting up of 60 units of 250 KW (totalling 15 MW) wind turbinesin Tirunelveli district by Cape Energy. Enercon is also playing a major role in developmentof wind energy in India. In Tamil Nadu, Coimbatore and Tiruppur Districts having morewind Mills from 2002 onwards, especially, Chittipalayam, Kethanoor, Gudimangalam,Poolavadi,Murungappatti (MGV Place),Sunkaramudaku,KongalNagaram,Gomangalam,Anthiur are the high wind power production places in the both districts.



Maharashtra (1942.25 MW)

Maharashtra is second only to Tamil Nadu in terms of generating capacity. Suzlon has beenheavily involved. Suzlon operates what was once Asia's largest wind farm, the VankusawadeWind Park (201 MW), near the Koyna reservoir in Satara district of Maharashtra.

Gujarat (1782 MW)

Samana &sadodar in jamanagar district is set to host energy companies like China LightPower (CLP) and Tata Power have pledged to invest up to Rs.8.15 billion ($189.5 million) indifferent projects in the area. CLP, through its India subsidiary CLP India, is investing closeto Rs.5 billion for installing 126 wind turbines in Samana that will generate 100.8 MW

power. Tata Power has installed wind turbines in the same area for generating 50 MW power at a cost of Rs.3.15 billion. Both projects are expected to become operational by early nextyear, according to government sources. The Gujarat government, which is banking heavily onwind power, has identified Samana as an ideal location for installation of 450 turbines thatcan generate a total of 360 MW. To encourage investment in wind energy development in the

state, the government has introduced a raft of incentives including a higher wind energytariff. Samana has a high tension transmission grid and electricity generated by wind turbinescan be fed into it. For this purpose, a substation at Sadodar has been installed. Both projectsare being executed by Enercon Ltd, a joint venture between Enercon of Germany andMumbai-based Mehra group.

ONGC Ltd has commissioned its first wind power project. The 51 MW project is located atMotisindholi in Kutch district of Gujarat. ONGC had placed the EPC order on Suzlon Energyin January 2008, for setting up the wind farm comprising 34 turbines of 1.5-mw each. Work on the project had begun in February 2008, and it is learnt that the first three turbines had

begun production within 43 days of starting construction work. Power from this Rs 308 crorecaptive wind farm will be wheeled to the Gujarat state grid for onward use by ONGC at its

Ankleshwar, Ahmedabad, Mehsana and Vadodara centres. ONGC has targeted to develop acaptive wind power capacity of around 200 MW in the next two years.

Karnataka (1340.23 MW)

There are many small wind farms in Karnataka, making it one of the states in India which hasa high number of wind mill farms. Chitradurga, Gadag are some of the districts where there

are a large number of Windmills. Chitradurga alone has over 20000 wind turbines.

The 13.2 MW Arasinagundi (ARA) and 16.5 MW Anaburu (ANA) wind farms areACCIONA¶S first in India. Located in the Davangere district, they have a total installed

capacity of 29.7 MW and comprise a total 18 Vestas 1.65MW wind turbines supplied by

Vestas Wind Technology India Pvt. Ltd.

The ARA wind farm was commissioned in June 2008 and the ANA wind farm, in September 2008. Each facility has signed a 20-year Power Purchase Agreement (PPA) with BangaloreElectricity Supply Company (BESCOM) for off-take of 100% of the output. ARA and ANAare Acciona¶s first wind farms eligible for CER credits under the Clean DevelopmentMechanism (CDM).



ACCIONA is in talks with the World Bank for The Spanish Carbon Fund which is assessing participation in the project as buyer for CERs likely to arise between 2010 and 2012. An

environmental and social assessment has been conducted as part of the procedure and relateddocuments have been provided. These are included below, consistent with the requirement of

the World Bank's disclosure policy.

Rajasthan (738.5 MW)

Gurgaon-headquartered Gujarat Fluorochemicals Ltd is in an advanced stage of commissioning a large wind farm in Jodhpur district of Rajasthan. A senior official toldProjectmonitor that out of the total 31.5 mw capacity, 12 mw had been completed so far. Theremaining capacity would come on line shortly, he added. For the INOX Group Company,this would be the largest wind farm. In 2006-07, GFL commissioned a 23.1-mw wind power

project at Gudhe village near Panchgani in Satara district of Maharashtra. Both the windfarms will be grid-connected and will earn carbon credits for the company, the official noted.In an independent development, cement major ACC Ltd has proposed to set up a new wind

power project in Rajasthan with a capacity of around 11 mw. Expected to cost around Rs 60

crore, the wind farm will meet the power requirements of the company's Lakheri cement unitwhere capacity was raised from 0.9 million tpa to 1.5 million tpa through a modernisation

plan. For ACC, this would be the second wind power project after the 9-mw farm atUdayathoor in Tirunelvelli district of Tamil Nadu. Rajasthan is emerging as an importantdestination for new wind farms, although it is currently not amongst the top five states interms of installed capacity. As of 2007 end, this northern state had a total of 496 mw,accounting for a 6.3 per cent share in India's total capacity.

Madhya Pradesh (212.8 MW)

In consideration of unique concept, Govt. of Madhya Pradesh has sanctioned another 15 MW project to MPWL at Nagda Hills near Dewas. All the 25 WEGs have been commissioned on

31.03.2008 and under successful operation.

Kerala (26.5 MW)

The first wind farm of the state was set up at Kanjikode in Palakkad district. It has a

generating capacity of 23.00 MW. A new wind farm project was launched with private participation at Ramakkalmedu in Idukki district. The project, which was inaugurated by

chief minister V. S. Achuthanandan in April 2008, aims at generating 10.5 MW of electricity.

The Agency for Non-Conventional Energy and Rural Technology (ANERT), an autonomous body under the Department of Power, Government of Kerala, is setting up wind farms on

private land in various parts of the state to generate a total of 600 mw of power. The agency

has identified 16 sites for setting up wind farms through private developers. To start with,ANERT will establish a demonstration project to generate 2 mw of power at Ramakkalmeduin Idukki district in association with the Kerala State Electricity Board. The project is slatedto cost Rs 21 crore. Other wind farm sites include Palakkad and Thiruvananthapuramdistricts. The contribution of non-conventional energy in the total 6,095 mw power potentialis just 5.5 per cent, a share the Kerala government wants to increase by 30 per cent. ANERTis engaged in the field of development and promotion of renewable sources of energy inKerala. It is also the nodal agency for implementing renewable energy programmes of theUnion ministry of non-conventional energy sources.



West Bengal (1.10MW)

The total installation in West Bengal is just 1.10 MW as there was only 0.5 MW addition in2006-2007 and none between 2007±2008 and 2008±2009

Bengal - Mega 50 MW wind energy project soon for country.

Suzlon Energy Ltd plans to set up a large wind-power project in West Bengal Suzlon EnergyLtd is planning to set up a large wind-power project in West Bengal, for which it is looking atcoastal Midnapore and South 24-Parganas districts. According to SP Gon Chaudhuri,chairman of the West Bengal Renewable Energy Development Agency, the 50 MW projectwould supply grid-quality power. Gon Chaudhuri, who is also the principal secretary in the

power department, said the project would be the biggest in West Bengal using wind energy.At present, Suzlon experts are looking for the best site. Suzlon aims to generate the power solely for commercial purpose and sell it to local power distribution outfits like the WestBengal State Electricity Board (WBSEB).

Suzlon will invest around Rs 250 crore initially, without taking recourse to the fundingavailable from the Indian Renewable Energy Development Agency (Ireda), said GonChaudhuri. He said there are five wind-power units in West Bengal, at Frazerganj, generatinga total of around 1 MW. At Sagar Island, there is a composite wind-diesel plant generating 1MW. In West Bengal, power companies are being encouraged to buy power generated byunits based on renewable energy. The generating units are being offered special rates. SBanerjee, private secretary to the power minister, said this had encouraged the private sector companies to invest in this field.

4.3 India¶s Potential in wind power generation



India has a coastal area of more than 6000 km. So this makes the availability of wind energy,with considerable speed, at a really high value. The factors which depend on the capacity of

electricity that could be generated are:

1. Quality of wind potential.2. Land availability for wind power generation

3. Seasonal changes in the wind speed and availability.

According to an assessment of AWS Truewind, India has a wind potential of 65000MW.There are land areas with excellent wind project potential where wind speeds exceeds 9 m/sat 80m hub height in same of the higher elevations. Lower elevation areas also show promisewith speeds at 100m height ranging from 6.5 m/s to 8 m/s. The significant resource coupledwith continued government support makes India a very attractive location for winddevelopment.

4.4 Environmental concernsWind power is a clean renewable energy source. There are, however some environmental

considerations to keep in mind when planning a wind power scheme. They include the

following:

Electromagnetic interference - some television frequency bands are susceptible tointerference from wind generators. Noise - wind rotors, gearboxes and generators create acoustic noise when functioning; thisneeds to be considered when sitting a machine. Visual impact - modern wind machines are large objects and have a significant visualImpact on their surroundings. Some argue that it is a positive visual impact, others to thecontrary.

4.5 Cost - economics

The cost of producing electricity from the wind is heavily dependent on the local windregime. As mentioned earlier the power output from the wind machine is proportional to cubeof the wind speed and so a slight increase in wind speed will mean a significant increase in

power and a subsequent reduction in unit costs. Capital costs for wind power are high, butrunning costs are low and so access to initial funds, subsidies or low interest loans are anobvious advantage when considering a wind-electric system. If a hybrid system is used acareful cost-benefit analysis needs to be carried out. A careful matching of the load andenergy supply options should be made to maximise the use of the power from the wind - aload which accepts a variable input is ideally matched to the intermittent nature of wind

power.

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