Multimillion-dollar installations from technology giants including Samsung, LG, Nikon, Panasonic, GoPro, Canon, Hisense, and Intel all fell dark, leaving crowds of people reaching for their mobile phones to light the way out.
A number of power outages were reported Wednesday at the Las Vegas Convention Center, where CES-the world's largest annual showcase of tech and gadgets-has been underway since Monday.
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"Someone told Alexa to turn off the lights", one person simply wrote.
Here's the trade group's statement about the outage: "We have been informed by Nevada Energy that the outage impacting the Central Hall and South Hall meeting room connector of the Las Vegas Convention Center (LVCC) has been addressed and they are in the process of testing and restoring power".
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A preliminary assessment found that moisture from heavy rains on Tuesday had caused a "flashover" in one of the convention centre's transformers, it said.
The first Sin City CES opened its doors 40 years ago, for starters, and the format switched from two shows every year (remember heading west in the winter and east in the summer?) to just Vegas 20 years ago.
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Not all technology at the show immediately came back to life, however. Ride hailing companies such as Uber and Lyft could not pick up passengers at the convention centre, but operated from parking lots a block or more away. The Consumer Electronics Show is due to continue until Saturday.