The electrical grid has some very serious limitations that most of the people are not aware of. For example you cannot recover from a blackout scenario without electricity. Only very few power plants are able to do that, the most common types are nuclear plants.
Another lesser known fact is that any windmill you put in your system requires a fossil based turbine as well to be able to control the surges and dips in the power production.
On the top of that, most of the windmills are not suitable for being placed for human population based on the frequency of sound they produce.
I think the future is clean nuclear power and some renewable sources.
https://en.wikipedia.org/wiki/Black_start https://www.youtube.com/watch?v=xBmk7t5K35A http://oto2.wustl.edu/cochlea/wind.html