Based ondependency of business on your Datacenter & its Criticality, the level of redundancies can be built in the electrical distribution system. The electrical system design should take care of your existing load and should be easily scalable to accommodate future expansion.
In case of emergency your electrical distribution should fall back to working path from nonworking path of distribution.
The distribution system can also be made to communicate every parameter on a central computer. Analysis can be made on PC about efficiency of Datacenter. The distribution can also be controlled remotely. You can actually turn on and off a server in the rack.