The following items can be cheaply recovered elsewhere in the event of destruction:
- Power plant (recovery cost: 1 gold per piece)
- Military central (recovery cost: 1 gold per piece)
- Base command (recovery cost: 1 gold per piece)
- Flak armor upgrade (recovery cost: 9 gold per piece)
- Flak weapon upgrade (recovery cost: 9 gold per piece)
- Factory extension (recovery cost: 9 gold per piece)

How to recover?
In this screenshot 5 power plants can be recovered: