Alta Wind Energy Center, California Largest Wint Farm 1320MW
Enercon-E126-7.5MW, Largest Wind turbine
Two projects out of 50-60GW potential;
Zorlu Energi 56.4MW & Fauji Fertilizer Company Energy
Limited 49.5MW - Jhampir, Sindh.
14.66cents/KWhr || to 2-3 cents/KWhr generation costs.
Minimum wind velocity (cutin speed) of 3-5 m/s
Nameplate capacity at 12-14 m/s.
Exceeding 25 m/s (cut-off speed) the turbine is
1. Blade 2. blade support 3. Pitch angle actuator 4. hub 5. spinner
6. main support 7. main shaft 8. aircraft warning lights 9. gearbox
10. mechanical brakes 11. hydraulic cooling devices 12. generator
13. power converter 14. Anemometers 15. transformer 16. frame of the nacelle 17.
supporting tower 18. yaw driving device
• Number of blades (commonly two or three)
• Rotor orientation (upwind or downwind of tower)
• Blade material, construction method, and profile
• Hub design: rigid, teetering or hinged
• Power control via aerodynamic control (stall control) or variable-pitch blades (pitch
• Fixed or variable rotor speed
• Orientation by self-aligning action (free yaw) or direct control (active yaw)
• Synchronous or asynchronous generator (with squirrel-cage rotor or wound rotor -
Doubly Fed Induction Generator (DFIG) with gearbox or direct drive generator.
• OFF SHORE - Sea bed for up to 40 m from sea floor while for 50m floating
turbines are used.
• ON SHORE -
Country Name of Company Market share Delivery 2011 in MW Totally installed
power in GW
Denmark Vestas 12.7% 5,217 50
China Sinovel 9.0% 3,700 13 
China Goldwind 8.7% 
Spain Gamesa 8.0% 3,308 24
Germany Enercon 7.8% 3,203 24
United States GE Energy 7.7% 3,170
India Suzlon Group 7.6% 3,116 20
China Guodian United
Germany Siemens Wind Power 6.3% 2,591 6.7
China Ming Yang 3.6% 1,500
WIND TURBINE MANUFACTURERS
INTERCONNECTION ISSUES AND
•Limitation of the generated
•Gradual insertion of the power
to be injected into the network
•Immunity from voltage
•Control of the active/Reactive