Poseidon Energy

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 a 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 intelligence into the late 2070s.
Poseidon was infamous for its 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 who paid millions to make the company billions.
They also made a practice of acquiring ground-breaking energy technologies through a 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.

Type

Corporation, Energy Industry