Create a new article
Write your page title here:
We currently have 56,922 articles on Fallout Wiki. Type your article name above or click on one of the titles below and start writing!

Fallout Wiki
Holiday Decor 2023.png

Begin your Odyssey with us.

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.[3] The company researched and developed weapons as well as held interests through their subsidiaries, such as Poseidon Oil and Gasoline.[4][5][6] 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.[7] The U-235 series outboard motor was developed by the company, and advertised as an atomic outboard boat motor. 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.[8]

Some of Poseidon's most promising research projects never reached their final stages.[9] 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.[10] Conversely, Poseidon employees such as Karl Oslow left due to work dissatisfaction.[11] In Oslow's case, they became competitors themselves, founding competing company, Mass Fusion.[11]


In the decades before the war, Poseidon was involved in every form of power production, distribution, and supply in existence. They mined and refined oil wherever it could be found and were among the last corporations to continue pumping gasoline for automobiles. Unlike other 20th-century energy moguls, they also diversified, profiting hugely from solar, fusion, and other alternative power sources.

But that was not the limit of Poseidon’s reach into global business. Leveraging their massive profits from energy, they diversified into military contracting and built robots, small arms, heavy weapons, combat armor, and even artificial intelligences into the late 2070s.
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.
They also made a practice of acquiring ground-breaking energy technologies through hostile takeover. Usually, such a move would take place only after the expensive R&D work was finished, with Poseidon rushing the newly acquired product to market.
To shield themselves from the legal ramifications of their choices, Poseidon kept their corporate structure loose: they were not a single entity, but rather a conglomerate of multiple corporations run by the same leadership and toward the same end. If one corporation lost a lawsuit, it closed, but the organization would simply sprout two more shell companies in its place. Their labor practices were similarly aggressive, as well as violently hostile toward any attempts to unionize. A walkout at their WV-06 plant was met not just with aggressive force, but with hallucinogenic riot control gas deployed to dispirit and humiliate the striking workers. This plan backfired dramatically, with the gassed protesters becoming a raging horde that successfully seized possession and control of the facility from Poseidon.

After the War
Most people in a position to know believe Poseidon ceased to exist as a cohesive entity after the War. The same fragmented structure that protected them in the modern age made the cartel vulnerable in the face of total system collapse. Instead, their influence in the wasteland is felt through the promise of their weapons’ technology.
In the years before the bombs fell, tensions and conventional conflicts created a boom in military technology. Poseidon spent billions developing next-generation weapons and other tools of war. Everything from laser pistols, to combat robots, to subdermal armor, portable rail guns, and plasma weapons received funding and research.
Most of those designs never reached completion before the Great War ended R&D more-or-less permanently but plans and some prototypes are found in forgotten corners of the wastelands. Explorers well-versed in science, and resourceful enough to gather components, may yet be able to turn some of those designs into working models.
This possibility drives some actions of the Brotherhood of Steel and the Enclave, with both factions striving to control this technology. Neither has succeeded yet, but even one weapon reaching production for either group could tip the balance, netting them the resources they need for cascading successes.
Poseidon’s tangled web of sub-organizations means that almost any structure anywhere in the wasteland could, in theory, be a Poseidon facility. One location in the Commonwealth stands out. Formerly a power plant using natural gas and solar generators, this vast complex still promises salvage and technical information to those willing to brave raiders who claim it, and the mirelurks in its lower reaches.
This plant is rumored to be the site of the infamous labor skirmish. This massive, multi-level structure is partially submerged, guarded by an automatic defense grid, and occupied by raiders spoiling for a fight. The ruins still house numerous technological treasures and other valuables to tempt explorers, however.

One final artifact of Poseidon’s global reach is PoseidoNet. At Poseidon’s height, this ultra-tech communications network allowed instantaneous communication between their facilities everywhere on the planet. Nodes that remain connected and powered up still function and are a key part of the Enclave’s communications infrastructure. Known working nodes can be found in most intact Poseidon facilities in New California. Offline nodes in Iron Mountain, NORAD, SAC, and HELIOS-1 could be brought online with sufficient time, expertise, and equipment. It’s possible, even likely, that other nodes exist, waiting for a human hand to touch their ON switch.
Fallout: The Roleplaying Game Core Rulebook p.231


Image Name Games
FO2 Loading Screen 4.png Control Station ENCLAVE FO2
FNV Location El Dorado Gas & Service.PNG El Dorado Gas & Service FNV
Fo2 Gecko Reactor Number 5.png Gecko's Nuclear Power Plant FO2
FNV Loction Helios One 2.png HELIOS One FNV
Fo2 Navarro Gas Station.png Navarro Gas Station FO2
PMV Valdez.jpg PMV Valdez FO2
Poseiden Energy turbine 18-F.jpg Poseiden Energy Turbine 18-F FO4
FO4 Loc Poseidon building 2.png Poseidon Energy FO4
Fo4 Poseidon Energy.jpg Poseidon Energy FO4
Playing Catch Up location.png Poseidon Energy Offices FOS
F76 Poseidon Power Plant.png Poseidon Energy Plant WV-06 FO76
F76 Poseidon PP Yard.png Poseidon Energy Plant Yard FO76
FNV Poseid locat 5.jpg Poseidon Gas Station FNV
FNV Posed unmarked McCar.png Poseidon Gas Station FNV
FNV Location 11021 3.jpg Poseidon Gas Station FNV
FNV Locations new 16421 2.jpg Poseidon Gas Station FNV
Poseidon Primm.jpg Poseidon Gas Station FNV
Poseidon REPCONN.jpg Poseidon Gas Station FNV
Poseidon gas station.jpg Poseidon Gas Station FNV
FNV Location 11021 5.jpg Poseidon Gas Station FNV
Poseidon Power substation PX-01.png Poseidon Power Substation PX-01 FO76
FO76 Poseidon Power substation PX02.png Poseidon Power Substation PX-02 FO76
FO76 Poseidon Power substation PX03.png Poseidon Power Substation PX-03 FO76
Poseidon Reservoir.jpg Poseidon Reservoir FO4





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


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

Behind the scenes

  • The company's slogan, "Begin your Odyssey with us," is a reference to Homer's the Odyssey, and Poseidon was the Greek god of the sea.
  • Chris Avellone shared concept areas about Poseidon Oil, stating that "Poseidon did not want its tankers using fusion cells because that would run contrary to the image of the company, despite its practicality."[Dev 1]
  • Poseidon Oil was planned for inclusion in Van Buren, Black Isle's canceled Fallout 3.[Doc 1]



  1. Advertisement poster
  2. Advertisement poster
  3. 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.}"
  4. 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)
  5. PoseidoNet
  6. 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.}"
  7. Thunder Mountain Power Plant terminal entries#Thunder Mountain Master Control Terminal
  8. Poseidon Energy Plant WV-06
  9. Hidden Valley bunker terminals; Terminal, Journal Entry 745
  10. Hidden Valley bunker terminals#Journal Entry 745
  11. 11.0 11.1 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."
Design Documents
  1. Maxson bunker design document 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."
Developer Statements
  1. 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."