[hemiblas]

WOW. I design electrical distribution systems for buildings for a living and this one sounds pretty impressive. 2MW of whole building UPS backup is not cheap. Its probably sized to carry the load until the gen kicks in but thats still a lot of batteries. The UPS systems probably have bypass switches to re-route power in case of failure.
A lot of the telecom carriers also believed in multiple levels of redundancy for a lot of their systems and didnt skimp. You may even find that some or possibly all loads are backed up by multiple sources of power so in case of a failure you just reroute power within your building to a different distribution panel or switchboard. They might have even talked the utility into dual services fed from indepenant utility transformers. Your generators are probably paralleled so that if one goes down the other kicks in.
That is truly a great find.