The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- NaturalAmbientThermalEnergy (2 members)
- RadiantIntensityUnit (1 member)
- Award (0 members)
- TransportSector (1 member)
- BiofuelPowerUnit (2 members)
- RenewableEnergyTransformationFunction (0 members)
- GreenhouseEffectDisposition (0 members)
- GeothermalPowerUnit (0 members)
- Peta (0 members)
- EnergyConversionPerformance (0 members)
- Road (0 members)
- Traction (0 members)
- ClassificationDocument (0 members)
- ScenarioStudy (0 members)
- SecondaryEnergyCarrier (8 members)
- Mile (0 members)
- DeclaredNetCapacity (1 member)
- GaseousRenewableFuel (0 members)
- StartUpSpeed (0 members)
- SlopeOfTheElasticPart (0 members)
- League (0 members)
- MicrogramPerMilliliter (0 members)
- CombinedHeatAndPowerPlant (0 members)
- BlockSize (0 members)
- SoftwareDocumentation (3 members)
- Pi (0 members)
- TestDataSet (0 members)
- State (0 members)
- Generator (3 members)
- EnergyStorageContent (0 members)
- Voxel (0 members)
- SourceCategory (0 members)
- Organisation (4 members)
- BetrachteterBereich (0 members)
- ImportOntologyModule (1 member)
- ProcessProfile (0 members)
- Mechanical (0 members)
- RoomUsage (0 members)
- Tera (0 members)
- OnshoreWindFarm (0 members)
- ElectricVehicle (3 members)
- Biogas (0 members)
- Gray (0 members)
- MaximumValue (3 members)
- TimeStampAlignment (0 members)
- PhotovoltaicCell (0 members)
- Abteilung (0 members)
- EnergyTransformation (14 members)
- GaseousSyntheticFuel (3 members)
- AreaUsageType (0 members)