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Poseidon Energy was a pre-War energy conglomerate that operated a number of oil rigs, factories, refineries, gas stations, and power plants and with further operations in military defense contracts.


Poseidon Energy was focused on renewable and non-renewable power sources on both the east and west coasts of America.[1] The company researched and developed weapons as well as held interests through their subsidiaries, such as Poseidon Oil and Gasoline.[2][3][4] Utilizing PoseidoNet, a national transfer system that provided communication between various facilities.

Poseidon Energy had several subsidiaries, projects, and products. Poseidon Energy was also engaged in alternative energy sources, such as solar and an affiliate, Petró-Chico in Mexico. The company utilized the Poseidon Power Management System in Appalachia to operate its nuclear power plants.[5] The U-235 series outboard motor was developed by the company, advertised as an atomic outboard boat motor.[6] Poseidon cooperated with other companies, such as Atomic Mining Services, and was openly hostile to organized labor. When workers organized a walkout at Poseidon Energy Plant WV-06, supported by the Associated Miner's Union, the corporation called in the National Guard, which proceeded to gas the protesters using HalluciGen, Inc.'s riot control gas.[7]

Some of Poseidon's most promising research projects never reached their final stages.[8] In the post-atomic world, technology scavengers like the Brotherhood of Steel and the Enclave still try in vain to decipher Poseidon's plans and either confiscate this technology or turn them into working models.[9] Conversely, Poseidon employees such as Karl Oslow left due to work dissatisfaction.[10] In Oslow's case, they became competitors themselves, founding competing company, Mass Fusion.[10]






Poseidon Oil and Poseidon Gasoline are mentioned in Fallout: The Roleplaying Game.[Non-canon 1]


Poseidon Energy appears in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, Fallout 76, and Fallout Shelter.

Behind the scenes

Behind the scenes



  1. The Chosen One: "{126}{}{What oil rig?}"
    A. Ron Meyers: "{141}{}{There's a big Poseidon oil rig left out on the water. That's the final base of the Enclave, and unless I miss my bet, that's where your friends are, too.}"
    The Chosen One: "{143}{}{What else is going on out there on the rig?}"
    A. Ron Meyers: "{148}{}{Beats me. I was a Navarro tech, not a rig operator. We talked to them over the comm lines, and that was about the extent of it.}"
  2. 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."
    (Danse's dialogue)
  3. PoseidoNet
  4. The Chosen One: "{171}{}{That’s right, sucker. Right where you can’t get me.}"
    Enclave communications officer: "{174}{powr15}{I’ve got you, at Poseidon Oil, reactor number 5. Ah, well, why don’t you just sit tight and I’ll order up a little celebration for ya. Including fireworks.}"
  5. Thunder Mountain Power Plant terminal entries#Thunder Mountain Master Control Terminal
  6. Callville Bay entryway sign
  7. Poseidon Energy Plant WV-06
  8. Hidden Valley bunker terminals; Terminal, Journal Entry 745
  9. Hidden Valley bunker terminals#Journal Entry 745
  10. 10.0 10.1 Mass Fusion building terminal entries; Company History


  1. Fallout: The Roleplaying Game Rulebook p. 231: "Poseidon was infamous for aggressive strategies in maintaining its market share and profit margins. It operated with a bewildering array of sub-corporations, daughter organizations, and cat’s paws. These ranged from overt branding efforts like Poseidon Oil and Poseidon Gasoline, to back-channel deals made with lobbyists paid millions to make the company billions."
  2. Maxson bunker design dcument page 3: "In the year 2067, Senator Todd Peterson decided to build a secret bunker to house himself and his family should war break out. Senator Peterson was a wealthy man in his own right, but lacked the funds necessary for such a project. Through secret dealings with Poseidon Oil and a covert branch of the government known as the Enclave, the final funding for the project was attained. A construction sight was chosen in southern Colorado and work began."
  3. Fallout Bible 8: "Poseidon Oil (during the Pre-War years) would not want its tankers using fusion cells because that would run contrary to the image of the company, despite its practicality. Plus, the idea of something so big running on something so small hurts its self-confidence."