Feel like working stripless when the power goes off (including the backup/UPS?).
See what happened a few years back down under:
ATSB occurence number 200002836
This loss of electrical power caused TCU Air Traffic Control (ATC) workstations, software switching of voice communications channels, satellite communications, provision of the Sydney Terminal Approach Radar to Melbourne and Brisbane and operational room lighting, to fail.
The ATC workstations automatically began rebooting after the initial 14 second power outage. The workstations were not available for about 7 to 10 minutes longer while they rebooted.
The air traffic controllers in the TCU were unable to determine the relative positions of aircraft under their jurisdiction for about 7 to 10 minutes. By using the emergency bypass air/ground radio, controllers were able to direct flight crews to keep a visual lookout for aircraft and to turn on their Traffic Alert and Collision Avoidance System (TCAS).
...
It was expected that the reliability and redundancies incorporated in the system design would preclude a total electrical failure.