Officials say the power will remain out overnight at one tower of the Rio casino in Las Vegas, and guests who were in the 900 affected hotel rooms will be moved elsewhere.
Spokesman Richard Broome of the Rio's parent company, Caesars Entertainment, says a plugged sink in a service area overflowed Wednesday by accident and shorted out the fuse in the main power system.
A backup generator kicked in, but water from a fire sprinkler compromised it and power in the Masquerade Tower was totally knocked out Thursday morning.
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Broome says guests who were evacuated earlier were being escorted to their rooms to retrieve their belongings and were being placed in other hotels.
Broome said he hoped the tower would be fully reopened by New Year's Eve.