The Equinix IBX in NJ is hard core. It's served by two different local grids coming into the building from two transmission stations.
But, the last power failure took out the whole east coast, so having two grids didn't turn out so useful --- in that case Equinix's generators held everything up. They have massive UPS batteries that can last hours so in case of a generator failure, their battery supply buys them some time to get it fixed asap.
TowardEX Technologies, Inc.
Metro-Boston Affordable Colocation, Dedicated Servers & IP Consulting
http://www.towardex.com [email protected]