- Prerequisite Tech: N/A
- Strength: 1
The default reactor for units. Units with Fission have the highest unit costs but the lowest minimum unit cost. Later in the game, it is ideal for worm-killing units since psi combat ignores reactor strengths, and without a strong weapon, more advanced reactors will usually make the unit more expensive.
- Prerequisite: Fusion
- Strength: 2
The first more powerful reactor you can get. The decrease in build costs is noticeable, and your units will be nearly unstoppable until your opponents discover Fusion as well.
- Prerequisite: Quantum Power
- Strength: 3
Reactors beyond Fusion are of little use, since the game will probably be over by this point.
- Prerequisite: Singularity Mechanics
- Strength: 4
The hidden faction, the Firaxians, start with the ability to use the Singularity Engine, making them able to create powerful, and cheap, units from the start of the game.