Poseidon Oil

Poseidon Oil was a subsidiary of Poseidon Energy before the War.

Background
Easily the most recognizable of the companies operating under the Poseidon name, Poseidon Oil did not limit itself only to the excavation, pumping, and transport of petroleum - it also operated a number of nuclear power plants, one of which was Atomic Powerplant № 5 in Gecko. Major installations belonging to this corporation were the Poseidon Oil Rig, later used as the headquarters of the Enclave on the Pacific Ocean, and the Navarro Refinery on the coast of California.

In 2040, in association with Vault-Tec Corporation and the U.S. government, the company commandeered Tibbets Prison. In 2067, along with the Enclave, Poseidon Oil helped finance Senator Todd Peterson's secret bunker.

Appearances
Poseidon Oil appears in Fallout 2 and is mentioned in the Fallout Bible.