Geothermal Power Plant

Geothermal Power Plant is a room in the Pyrosphere in Metroid: Other M. Samus encounters the fully matured form of Ridley's clone in this room, after finding the creature's previous form as an empty husk some rooms before. The Power Plant is where Samus is forced to fight Ridley again, and also where Anthony Higgs almost dies after being knocked into the lava below by Ridley. The room contains an Energy Tank atop a Super Missile door, though Samus does not need Super Missiles to get it. There are two staircases leading to it. There is also a Grapple Point suspended in midair, leading to a hidden alcove with an Accel Charge unit. A door on the opposite side of the room leads to a large, circular arena where Samus encounters Ridley in his adult form after destroying the Magma-eruption port and raising the lava level.

thumb|300px|right

Dead or Alive: Dimensions
The Geothermal Power Plant is an arena in the upcoming game Dead or Alive: Dimensions, for the Nintendo 3DS, also made by Team Ninja. The arena features Ridley as a stage hazard who will occasionally launch balls of fire at the combatants, and scrape any fighters who fall off the edge of the stage against the wall and KO them with more fire. Samus also appears at the end, dropping a Power Bomb in the middle of the stage to kill Ridley.

Trivia

 * After leaving the "arena" section of the Geothermal Power Plant through a hole Ridley bored into the wall, Samus is seemingly unable to return to that section on account of the hole being too high to reach from the hallway side. However, it is possible to reach the hole via a Shinespark: although the arena is still intact on the other side, an invisible barrier will prevent the player from actually entering.