As a service to people in the department with equipment on battery backup, we have created a read-only mailing list called "power" for notifications of actual (as opposed to planned) power events in the CS Building. These include power failure and power restoration as well as On-/Off-Battery events for the main UPS in room 218, the UPS in 002 that powers some 002 equipment, and the Friend Center UPS that powers FC-010 as well as CS 002.
The primary benefit of the list is to let people know when their equipment is on battery power. They can then decide if they want to remotely login to their servers and cleanly shutdown equipment before the batteries discharge. To subscribe, visit: https://lists.cs.princeton.edu/mailman/listinfo/power