Power in the North and Central halls of the Las Vegas Convention Center, which hosts CES annually, was out for nearly two hours on Wednesday. First reports of the power outage began hitting Twitter from convention goers starting around 11:14AM PT, and was slowly restored shortly after 1:00PM PT. Security evacuated most visitors from the affected halls during that time.

“A preliminary assessment indicates that condensation from heavy rainfall caused a flashover on one of the facility’s transformers,” reads a statement from the CTA, the organization that puts on CES. “We are grateful to NV Energy for their swift assistance, to our customers and their clients for their patience and to the staff for ensuring the safety and security of all attendees and exhibitors.”

The outage impacted hundreds of companies, including giants like LG, Samsung, and Sony, as well as many small startups that paid thousands of dollars to have a presence on the massive show floor. This year’s CES seems to be marked by more chaos than usual, including unprecedented rain that flooded streets and shut down Google’s giant funhouse booth for a day.

Update Jan 10th, 4:17 PM: Article regularly updated with developing information.