Generator B

Generator B is a room on Norion in Metroid Prime 3: Corruption. During the Space Pirate Invasion of Norion, Rundas manages to bring this Generator back online in order to activate the Anti-Orbital Cannon and destroy the Leviathan headed directly for the planet.

Afterwards, when Samus explores the area, the room is overrun with spent Phazon from the invasion. Inside the room is a Metroid Hatcher, which, after destroyed, allows Samus to take an Energy Cell inside. It is entirely optional to explore this room in the game, as Samus only needs five of the nine Energy Cells to find the Pirate Command Code on the GFS Valhalla, and thus complete the game.