What are you basing this on? I've seen many datacenters fail to kickover to backup power for various reasons. This is a process that has to work in under like 3

What are you basing this on? I've seen many datacenters fail to kickover to backup power for various reasons. This is a process that has to work in under like 30 seconds. For places with spinning mass, that's the amount of time that the spinning mass will power the systems while the generators are kicked on. [1] The generators have been know to fail hard, and then the entire DC is down. On top of that, generators often are only able to run for a limited amount of time hours to days [2]. [1] https://en.wikipedia.org/wiki/Flywheel_energy_storage https://en.wikipedia.org/wiki/Flywheel_energy_storage [2] http://www.graniteblockglobaldatacenter.com/powersystems.html http://www.graniteblockglobaldatacenter.com/powersystems.htm...