Common Information Model (Energy)
Comprehensive model for electricity network data. Grid topology, equipment, markets, SCADA.
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Where this one tends to earn its keep.
Power grid network modeling
Electricity market data exchange
SCADA system integration
Renewable energy grid management
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.