They're switching over to the Google pioneered system where each server has its own 12 V DC battery. The savings comes in from the fact that the centralized UPS design has losses from ac and dc conversions for one, and for two the power transmission from a centralized location has greater power loss from heat over longer lines to the servers than a direct battery connection.
Bit of a read here »www.upsonnet.com/Articles/Learni ··· ign.html
and here »gigaom.com/cleantech/a-key-to-go ··· -server/--
Change the scheme, alter the mood! Electrify the boys and girls if you'd be so kind.