I was at the park in line for Verbolten in the outdoor part of the line, beside the final brake run. The fans, lights, and music in the line and the station went off for about 30 seconds. Emergency battery-powered lights (like you'd find in most buildings) came on. people who were sitting in the trains in the station were made to get off and go back into the corrals. Ride ops yelled to those in the trains on the brake run that maintenance staff was on the way to get them off. Within a couple minutes, someone came with a tool to unlock each seat, and riders were escorted back into the station. We got out of the since they were saying they were not sure how long the ride would be shut down.
The power was back on, but no rides in Germany or Italy were running. Some of my group was near Der Wirblewind. They said that ride was running but made a loud noise and jerked when the power went out. A backup system then kicked in to lower riders back down to the ground. Within 30-45 minutes, we noticed that most rides were running again.
There was helicopter crash near the William & Mary campus. I heard someone say that cause the outage, but I'm not sure whether or not that is true.
https://pilotonline.com/news/local/article_5f9c467e-82f5-11e8-92a2-535ea5d5e8f9.html
What is the procedure for roller coasters after power outages? Would riders on a lift hill or mid-course brake run be walked off? How long does it take for the ride control systems to reboot? Do they have to run empty trains through for testing before riders can board?