Poseidon Energy employee ID card

 is a miscellaneous item in Fallout: New Vegas.

Characteristics
Similar in appearance to holotapes, two of them are found during the "That Lucky Old Son" quest.

Locations
HELIOS One in the Solar Collection Tower in the same room as the mainframe computer.

Uses
Used to activate a repair robot in the solar collection tower to complete "That Lucky Old Son" quest if your repair skill is not high enough to repair the generator yourself.