Wind turbines are inefficient for multiple reasons:
1) They depend on the wind in order to spine
2) they must spin 15 meters per second in order to produce the most energy possible which the conversion rate is around 50%
3) They are really expensive and are unreliable in some areas.
If cells couldn't specialize, then the heart and other important organs would not function because if all cells did the same thing, the human would be one massive organ.