A system of components that converts the kinetic energy of the wind into electricity or mechanical power, and which comprises all necessary components including energy storage, power conditioning, control systems, transmission systems, etc is wind energy.
Limitations of wind energy:
Wind turbine buildings are only a few hundred feet tall, and winds reaching greater heights haven't been used.
It would be almost probably wrong to believe that no additional advances or improvements throughout wind turbine manufacturing would occur.
Their efficiencies are approximately of such limit.
