Did you know that wind energy actually comes from the energy of the sun? The differential heating of the earth by the sun, results in differential air pressures, which gives rise to wind. Well, almost every form of energy on earth comes either directly or indirectly from the sun!
This article gives a nice & short introduction to wind energy. There, they discuss the history of wind energy, major producers (countries) of electricity using wind energy, future of wind energy, important people/scientists who contributed to the development of wind energy, formula to calculate the kinetic energy & power (in watts) for wind energy, unit for measuring wind energy, and much more. Do read.