Changes
/* Blades */
* Less affected to turbulence in wind and low wind shear<br/>
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| bgcolor = "#DCE6F1"| Disadvantages
* Negative visual impact or noise.
* Limited availability of lands
* Affected to more turbulence
Sources:[http://library.thinkquest.org/06aug/01335/wind%20Power.htm Wind Power],[http://www.ehow.com/list_5938067_types-wind-farms-there_.html Types of Wind Farms]
| bgcolor = "#DCE6F1"| Disadvantages:
* Installing offshore wind-turbines is much more complex and costly
* Connection to the utility grid is also much more complex and expensive
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| align = "center" bgcolor = "#83caff4F81BD"|<font color="#FFFFFF">'''Different types of wind turbine towers'''</font>| align = "center" bgcolor = "#83caff4F81BD"|<font color="#FFFFFF">'''Structure'''</font>
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|bgcolor = "#DCE6F1"|'''Tubular Tower: '''They are constructed from rolled steel plates welded together with flanges top and bottom, being sprayed with several coats of gray weatherproof paint at the construction yard. They have doors top and bottom allowing entrance to the vertical ladders inside used to access the power cables and the yaw mechanism. There are also a set of vertical ladders on the outside of the tower accessing the nacelle for maintenance and other checks.|bgcolor = "#DCE6F1"|[[Image:turbular.jpeg|200px|center|thumb|Fig 8(a) [http://americanrenewableenergycorp.com/towers Tubular tower]]]
|-
| '''Lattice tower''': A Lattice tower can be constructed with perfectly shaped steel rods that are put together to form a lattice. These towers are very strong and inexpensive to manufacture and easy to transport and erect.
|[[Image:lattices.jpeg|center|200px|thumb|Fig 8(b) [http://www.mywindpowersystem.com/2010/03/wind-power-stats-quiet-critics/ Lattice tower]]]
|-
|bgcolor = "#DCE6F1"| '''Guyed wind tower''': These are very strong and most economical when properly installed. But it requires more space around the tower for guy wires|bgcolor = "#DCE6F1"|[[Image:guyed.jpeg|center|200px|thumb|Fig 8(c) [http://itgiproducts.com/energy/windTowers.asp Guy tower]]]
|-
| '''Tilt up wind towers:'''These type of towers are used for consumer wind energy. These turbines have locking system, while working the turbine is locked. It can easily locked and lowered to ground to perform repairs.
| [[Image:tiltup.jpeg|center|200px|thumb|Fig 8(d) [http://itgiproducts.com/energy/windTowers.asp Tiltup tower]]]
|-
|bgcolor = "#DCE6F1"| '''Free standing tower:'''These can be used for small wind turbines with cautions.|bgcolor = "#DCE6F1"| [[Image:free.jpeg |center|thumb|Fig 8(e) [http://itgiproducts.com/energy/windTowers.asp Free stand tower]]]
|}
Sources:[http://windertower.com/ Winder Tower],[http://www.thesolarguide.com/wind-power/wind-towers.aspx Wind Towers]
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| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Single blade HAWT'''</font>| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Two blade HAWT'''</font>| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Three blade HAWT'''</font>
|-
|bgcolor = "#DCE6F1"| It reduces the cost and weight of the turbine. These are rarely used due to tower shadow effects, needs counter weights on the other side of the blade, less stability.|bgcolor = "#DCE6F1"| It requires more complex design due to sustain of wind shocks. It is also less stable. It saves the cost and weight of one rotor blade.|bgcolor = "#DCE6F1"|Modern wind turbines uses three blade concept. Because this structure have hight strength to withstand heavy wind storms. Less effect due to tower shadow. Produces high output|-|[[Image:single.jpeg|center|200px|thumb|Fig 9(a) [http://www.wind-energy-the-facts.org/en/part-i-technology/chapter-3-wind-turbine-technology/evolution-of-commercial-wind-turbine-technology/design-styles.html Single blade turbine]]] | It requires more complex design due to sustain of wind shocks. It is also less stable. It saves the cost and weight of one rotor blade.[[Image:two.jpeg|center|300px|thumb|Fig 9(b) [http://www.trendir.com/green/?start=15 Two blade turbine]]]|Modern wind turbines uses three blade concept. Because this structure have hight strength to withstand heavy wind storms. Less effect due to tower shadow. Produces high output[[Image:three.jpeg|center| 200px|thumb|Fig 9(c) [http://www.china-windturbine.com/wind-turbines-blades.htm Three blade turbine]]]
|}
Sources:[http://guidedtour.windpower.org/en/tour/design/concepts.htm Wind Turbine Blades],[http://www.wind-energy-the-facts.org/en/part-i-technology/chapter-3-wind-turbine-technology/evolution-of-commercial-wind-turbine-technology/design-styles.html Wind Turbine Design Styles]
