- Main article: Unidentified Signal Source
High Grade Emissions are a type of signal source where certain Rare and Very Rare Manufactured Materials can be obtained. They are empty aside from the free-floating materials and occasionally a single, non-hostile ship that will eventually depart.
- Federal systems:
- Imperial systems:
- Civil Unrest system states:
- War or Civil War system states:
- Outbreak system states:
- Boom system states:
For systems that exhibit more than one condition listed above, the materials spawned will be randomly chosen from the list of applicable materials.
High Grade Emissions appear only in populated systems, usually in deep space or occasionally in spheres of influence. In Federal and Imperial systems, any High Grade Emissions present will have their status as "N/A" or "Civil Liberty". Scanning a system's Nav Beacon can cause High Grade Emissions to appear if none are already present.