Even after the power was restored, companies had to go through the hassle of resetting devices on display - those connected wirelessly with each other, in particular.
"A preliminary assessment indicates that condensation from heavy rainfall caused a flashover on one of the facility's transformers", the CTA's statement reads.
Power outage causes attendees to evacuate Central Hall at CES in Las Vegas on Wednesday, Jan. 10th, 2018.
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Thousands of people attending the world's biggest consumer technology show got a chance to test the battery life of the latest gadgets Wednesday when some showrooms and hallways went dark inside the vast Las Vegas Convention Center. CES is, as NBC News notes, the biggest tech show in the world. While power within the South Hall was restored minutes later, it took two hours to fully restore power in the Central Hall, with conference organisers confirming on Twitter at 1.09pm that power was slowly being rolled out in the Central Hall.
It had been the city's first rainfall in 116 days, and had marked the wettest January day on record for the area, according to the Las Vegas Review Journal newspaper.
The Consumer Technology Association, which runs the event, has thanked visitors for their patience.
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As one would expect at an event filled with tech enthusiasts, plenty of pictures and videos of the eerily darkened scene hit Twitter during the outage, with the hashtag #CESBlackout quickly becoming a top trending topic. Intel had a tongue-in-cheek announcement for a product called "Blackout". The power outrage, caused by an error with fairly rudimentary electronics, is ironic considering the wealth of next-generation technology exhibited throughout the event.
And in a sign of the huge energy draw from the tech show, once the crowds were let back in, the return to full, blazing electronic glory was slow.
CES attendees posted images on social media of the blackout, with one sharing a video of a woman playing a violin to entertain guests at the Intel booth.
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TV maker LG's OLED Canyon display demo, with 246 OLED panels and more than 30 high-definition generators, took almost an hour to get back in full operation.