The Population Unit or is a fundamental source of production for an empire. Almost all FIDS production is provided at a rate per , and the growth of a population source is immensely valuable to any empire.
Each population unit produces a certain amount of FIDS depending on the planet and system improvements it is placed in. production thus scales with the amount of population an empire has. Four major factors affect FIDS rates per population - Planets, Planetary Exploitation, and most Improvements. Because of this, having a large population is important to developing an empire.
- Main article: Food
Growth is calculated per star system. Population requires to grow. Having a large source of food is important for sustaining growth. At least one planet per system should have a large source of food to ensure good growth.
Each planet has a maximum to the amount of population it can sustain.
- Improved Thermodynamics (tier 3) - Endothermic Structures (+2 Tiny, +1 Small)
- Non-Baryonic Shielding (tier 7) - Psychological Insulation (+1 Planets, +1 Planets with explored moon)
- Personal Fields (tier 8) - Living Habitats (+1 Tier V)
- Sustainable Supercities (tier 11) - Self-Replication Habitats (+2 Planets)
- Horatio's Shared Fields (tier 8, replaces Personal Fields) - Stable Habitats (replaces Living Habitat) (+1 Tier I, II and V)
- Racial trait Crowded Planets (+2 Tiny and Small, +1 Medium)
- Several anomalies add +1 to the planet (Deserted Cities, Hollow Planet, Low Gravity, Friendly Locals, Garden of Eden)
Maxima (including the above improvements, racial trait, one anomaly and an explored moon) are listed on the table above in brackets (#) next to the default value