Open Energy Ontology
Open ontology for energy domain — carriers, technologies, models, scenarios for energy system analysis.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Energy system model comparison
Renewable energy scenario planning
Energy technology assessment
Open energy data standardization
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Energy.