I agree it's a lot of power but it should also be possible to have 100 Antminer S9 without having to spend too much on electrician if you get what I mean right? I'm sure fellow miners will have some ideas on how to minimise cost.
Again, it must be emphasized this is a VERY DANGEROUS project to start your learning about electrical wiring and distribution!!
If you are not comfortable with and already have experience doing at least basic wiring in your home DO NOT EVEN THINK ABOUT doing this yourself and learning along the way.