Power went out in a section of Las Vegas that includes the MGM Grand hotel, according to a report.
Video posted to Twitter by Christine Maddela, a local reporter, showed the darkened hotel lobby at around 3 p.m.
“Emergency Response Team members at MGM Grand say an engineer was working on a generator when it malfunctioned/exploded. They say the engineer was hurt and is heading to the hospital,” Maddela tweeted.
The outage came on the 40th anniversary of a massive fire at the MGM Grand that killed 85 people.
Another Twitter user posted that the juice had come back by 4 p.m.