We colocated in both Fremont DCs for about 10 years. Their newer one had 2 power outages within a couple months when we were there (I think this was in 2009 or 2008). I don't remember why exactly it happened, but I think for at least one they had redundant power disconnected for reasons. Other than that we had no issues though.

But it's been about 7 years since we've colocated our servers there.