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The Vault - Fallout Wiki
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For the location in Fallout 4, see Poseidon Energy (location).
Poseidon Energy
Poseidon Energy logo.png
Company data
IndustryEnergy and weapons research and development
CountryUnited States of America
LocationsControl Station Enclave
Navarro Refinery
Atomic Powerplant № 5
PMV Valdez
Helios One
Poseidon Energy, Boston
Poseidon Energy turbine No.18-F
Poseidon Reservoir
Poseidon Energy Plant WV-06
Poseidon Power Substation PX-01
Poseidon Power Substation PX-02
Poseidon Power Substation PX-03
Van BurenGametitle-VB.png Eagle Rock mining complex
Corporate connections
SubsidiariesPoseidon Gasoline
Poseidon Oil
Hermes Communications, Inc.
Van BurenGametitle-VB.png Prometheus Coal
Van BurenGametitle-VB.png J.E. Sawyer's Fallout RPGGametitle-JES.png Agricola
Van BurenGametitle-VB.png Greenway Hydroponics

Begin your Odyssey with us.

Poseidon Energy was incontestably the most powerful energy conglomerate on Earth prior to the Great War. If it produced energy, Poseidon Energy either made it, acquired it, or refined it. Outside of energy, Poseidon also produced for the United States Military and was the chief producer of Enclave technology before the war.


Poseidon Energy was an umbrella corporation with its fingers in virtually all known forms of renewable and non-renewable power sources on both the east and west coasts of America,[1] as well as research and development of new, more powerful weapons through their subsidiaries, so long as they remained profitable. One of its most notable features was the unified PoseidoNet, a national transfer system that provided instantaneous communication between various Poseidon facilities including Atomic Powerplant № 5, Control Station Enclave, Navarro, Helios One, the power plants of Appalachia, and other locations throughout the United States and possibly the world.[2]

Energy mogul

Poseidon Energy dipped its arms into every energy source imaginable that, with help, could be weaponized or developed further. Poseidon Gasoline served as the face of gasoline, providing automobiles that still used the substance with it in the Northwest Commonwealth.[3] Poseidon Oil focused on the mining and refining of what little reserves of oil still remained in the world.[4] Poseidon Energy, while also focusing on gasoline and oil production, involved itself with a number of alternative energy sources as well, from solar energy to newly discovered forms of energy. They also had a branch in the Mexican area. The conglomerate was also not above buying out companies that delved into energy production, especially those founded by former employees of Poseidon.[5]

In its drive to control the energy market, Poseidon cooperated with other companies, such as Atomic Mining Services, and was openly hostile to organized labor. When Poseidon workers organized a walkout at Poseidon Energy Plant WV-06, supported by the Associated Miners Union, the corporation supported its on-site security director, Brent Olsen, in his plan to humiliate the strikers and the union. Poseidon called in the National Guard, which proceeded to gas the protesters using HalluciGen, Inc.'s riot control gas. What the corporation hoped would be a violent riot that could be leveraged to further damage organized labor turned into bedlam, as the gas turned peaceful protesters into a rampaging horde that overran the perimeter, exposed soldiers to the gas, and eventually seized control of the plant. The Great War mercifully ended any further manipulations of the sort.[6]

Defense contractor

Though much of the pre-War United States knew of Poseidon, few were aware that several Poseidon-owned companies were given lucrative defense contracts by the U.S. government – or rather, by Enclave members working as lobbyists to gain those contracts.[2] However, most of Poseidon's most promising research projects never reached their final stages.[7][8]

Many of Poseidon's most promising projects never reached their final stages. After the Great War, Poseidon no longer existed as a real force in the post-atomic world. However, technology scavengers like the Brotherhood of Steel and the Enclave still tried in vain to decipher Poseidon's plans and either confiscate this technology or turn them into working models, respectively.[9]

Corporate relations

One of the many derelict gas stations operated directly by Poseidon

The corporation operated a number of daughter companies, which focused on different aspects of the global energy market:

  • Petró-Chico was "Un Amigo De Poseidon Energy,", a Mexico-based oil refinement and distribution company.
  • Poseidon Oil focused on petroleum extraction and processing, although it also invested in other energy resources, including nuclear power.
  • Poseidon Gasoline was Poseidon's division focusing on distributing gasoline and operating gas stations.
  • Gray paragraphs are based on Van Buren and were not confirmed by primary sources Prometheus Coal focused on coal extraction.
  • Gray paragraphs are based on Van Buren and were not confirmed by primary sources Agricola was a subsidiary dedicated to uranium extraction.




Behind the scenes

  • Poseidon was the Greek god of the sea as well as horses and earthquakes. His weapon and symbol is the trident. Poseidon's projects often used codenames drawn from Greek mythology.
  • The Odyssey was a Greek epic poem written by Homer, it depicted the adventures of Ulysses, or Odysseus, after the Trojan War.



Poseidon Energy or its divisions are mentioned in Fallout, Fallout 2, Van Buren, Fallout: New Vegas, Fallout 4, and Fallout 76.


  1. 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) Note: location comment; Poseidon Energy, generator room - the part past the raider defenses.
  2. 2.0 2.1 PoseidoNet in Fallout 2 identifies the Oil Rig as "Control Station ENCLAVE" along with several other Enclave sites, suggesting a link between Poseidon Energy and the Enclave.
  3. Navarro gas station
  4. see Poseidon Oil for details.
  5. see Mass Fusion for details.
  6. See Poseidon Energy Plant WV-06 for details and references.
  7. Hidden Valley bunker terminals; Terminal, Journal Entry 745
  8. Reid Underwood's terminal details the MPLX Novasurge, the prototype of the unnamed plasma pistol that was almost exclusive to the Enclave military forces.
  9. Hidden Valley bunker terminals#Journal Entry 745
  10. Thunder Mountain Power Plant terminals#Thunder Mountain Master Control Terminal
  11. Callville Bay sign
Enclave Symbol (Fallout 3).png
Enclave Symbol (Fallout 3).png