Here's an idea that I mentioned to Risujin a long time ago (months)
Battery Backup for Turrets and Armories when moving reactor (due to planned move or n00b retardedness)
When the reactor goes down, you get 15 Seconds of Emergency Power, (complete with Blaring Siren and Countdown to complete power loss.)
Teleporters, Medpads, Teslas and Defense Computers are however NOT battery powered.
I think this would be enough time for most players to realize what has happened and grab a Construction Kit and avert disaster.
However when the Reactor is REALLY blown up by Aliens, a power surge disables the Battery Backup, and you don't get any 15 seconds of power.