A Power-Room is located in a Halo Installation, which is connected to other power-rooms placed around the entire ring. The ones on Installation 04 featured a large vertical core and a dome-shaped roof, with large glass windows which run down the side. The energy which powers the Installation can be seen pulsating up through the core and then back down through the windows.
The first time a player sees a power-room is in Halo: Combat Evolved at the beginning of the level Assault on the Control Room. It is guarded by several Unggoy that, being the fact that only one was awake at the time, fail to stop John-117 from entering the rest of the Installation, which in turn, costs them their lives at the hands of the UNSC. Installation 04's power-room was conveniently placed for Echo 419 to drop off John-117 so he could begin his attack since it was the closest to the Control Room.
- Halo: Combat Evolved
- ↑ Halo: Combat Evolved - Assault on the Control Room (level)