Citadel Station Main Reactor

The Citadel Stations Main Reactor is the main reactor of the Station. It fuelled the ships Hypermatter Reactor which allowed it to operate all of its systems, as well as the hyperdrive - which allowed the ship to enter Hyperspace. The Main Reactor is actually visible from the Emperors Throne room, as the bridge to the throne itself is a walkway over the large drop to the reactor.