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 HELIOS One quest but don't appear to have any use. Taking up no weight and having no value makes them worthless for anything other than collection.

It is possible they are used when activating the ARCHIMEDES II security system as part of the quest. (Unconfirmed)

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

Uses
Collection only.