Easily the most recognizable of the companies operating under the Poseidon name, Poseidon Oil did not limit itself only to the excavation and pumping of petroleum - it also operated a number of nuclear power plants, one of which was Atomic Powerplant № 5 in Gecko.[1][2] Major installations belonging to this corporation were the Poseidon Oil Rig,[1][3] later used as the headquarters of the Enclave on the Pacific Ocean, and the Navarro Refinery[1] on the coast of California.
The following is based on Van Buren and has not been confirmed by canon sources.
↑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.}" (Gcpacoff.msg)
↑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.}" (Fcronmey.msg)