Energy is the second resource in Zero-K.
The primary sources of energy are energy-producing structures:
- Solar Collector
- Wind/Tidal Generator
- Geothermal Generator
- Advanced Geothermal
- Fusion Reactor
- Singularity Reactor
Most energy-producing structures may be constructed anywhere. Geothermal Generators and Advanced Geothermals may only be constructed on geothermal vents.
Constructing any unit or building requires as much Energy as it does Metal. Repairing and resurrecting units and buildings also requires Energy, as does operating cloaks, shields, jammers, radar and sonar.
Excess energy is automatically used for Overdrive, increasing metal output.