When this first came up, I kept thinking "power outages happen; perhaps not everyday, but often enough that you should have a reasonable contingency plan in place".
View From the Wing just posted a trip report that offers an example of doing this right in a place where power outages happen more often.
http://boardingarea.com/viewfromthew...e-hyatt-world/
"The hotel, being in Chennai, occasionally loses power. And by occasionally I mean somewhere between every other day and twice a day. When that happens you just wait a few seconds and the hotel’s in-house generators kick in. There’s even a sign in the elevator telling you this is normal. ... The power outage never did last even 30 seconds at a time."