Halo Wars World

Power is everything. A UNSC firebase is powered by a small hydrogen reactor which allows it to operate some pretty sophisticated systems. In order to set up a base quickly, it has to be small, but these power plants are modular. As you expand your base of operations and field more complicated weapon systems you are going to need more power. Base sockets can facilitate the addition of larger hydrogen reactor units which provide the juice to allow you to field more and more sophisticated weaponry. These additional reactors built into your base sockets are even modular and can be upgraded, but at great expense, to double their output.

Protect your base reactors. They are prime targets for enemy raids. When they are destroyed, you will no longer be able to field your heavy hitting Scorpions or Vultures.