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Poseidon Energy is a location in the Commonwealth in 2287. It was formerly a power plant, which used natural gas and solar energy, owned by the Poseidon Energy corporation.[1]


This Poseidon Energy corporation power plant uses natural gas and solar energy. Currently, a gang of raiders led by Cutty has set up defenses against the robot security active at this location, as well as encroaching mirelurks throughout the multiple levels within.


The facility's exterior is almost surrounded by catwalks patrolled by several raiders. The front and roof access doors are both Master locked. The southeast side of the facility has two drainpipes, one of which can be used to enter the Poseidon Energy sublevels.

The sublevel is partially submerged, making it a home for mirelurks, with a few automated defenses thrown in for good measure. There are two Novice-locked safes with minor loot: one through a submerged doorway near the security door terminal, and the other in an office supply closet with skeletons.

Entering from the sublevels leads right to the front door. A Novice-locked wall safe is near the "Restricted Area" sign visible from the front door. Through the yellow-lined doorway is another security terminal with a door. Opening this door will activate the main floor's automated defenses, which will start fighting the raiders on the catwalks above. Progress is pretty linear through this area with just a couple of side rooms, one of which contains a chemistry station. A short jaunt beyond the chemistry station is the ramp to the roof access door. Cutty clad in raider power armor awaits in the central structure, guarding the Endurance bobblehead and a Tesla Science magazine.

Synths have been sighted here attacking the raiders inside the building. Depending on the level, there may also be a courser. If one has a good relationship with the Institute, they will not attack.

Notable loot

  • Endurance bobblehead - On a desk in the upper area that contains the 'Glory' chair.
  • Tesla Science Magazine - On the same desk as the Endurance bobblehead.
  • Two Vault-Tec lunchboxes - In the lower flooded levels at the end of an underwater pipe in the west section, and on the eastern corner of the factory floor behind a ramp on the lower shelf.
  • Cutty drops the Poseidon Energy key, which unlocks both the front and roof doors.
  • A complete Giddyup Buttercup underwater in the first flooded room with the broken pipes, behind a pipe in the northeast corner of the room.

Related quests


  • Opening the security door on the floor level will reactivate the dormant security turrets and Protectrons within the facility.
  • There is a flooded sub-level inside.
  • There are two Master locked doors located on the car park and on the roof that can be used for easier access to the Endurance bobblehead and Tesla Science magazine.

Companion comments

  • When at this location, companions make comments, which are activated at the generator room - the part past the raider defenses.
Location comments
Character Comment
Cait "We should search the place for parts. Might find somethin' worth a few caps."
Codsworth "These generators have seen better days."
Curie ""
Danse "Poseidon Energy was one of the largest power companies on the East Coast. I heard they were trying to buy out Mass Fusion right before the war began."
Deacon ""
John Hancock "Could cook a lot of chems with this much juice."
Nick Valentine "Quite the setup they had in here."
Piper Wright "Surprised these haven't been harvested for parts."
Preston Garvey "Hard to imagine how much power they used in the old days. And this is only one of the old power plants in the Commonwealth."
Robert MacCready "Just one of these generators could power a settlement. Too bad they're out of commission."
X6-88 "It's unusual to find this much machinery intact. The scavengers typically tear these things to pieces."


Poseidon Energy appears only in Fallout 4.


PCPC Playstation 4Playstation 4 Xbox OneXbox One Cutty may not be hostile towards the player character, likely due to the appearance of the synths.[verified]



  1. Fallout 4 Vault Dweller's Survival Guide Collector's Edition p.392-393: "[6.28] POSEIDON ENERGY
    This Poseidon Energy corporation power plant uses natural gas and solar energy. Currently, a gang of raiders have set up defenses against the robot security active at this location, as well as encroaching mirelurks."
    (Fallout 4 Vault Dweller's Survival Guide Map)