Premodifier: electric power
Head noun: system

Same concepts
http://dbpedia.org/resource/Electric_power_system

Broader concepts

labelprovenanceconfidence
critical infrastructureisap:4720188690.756291

Narrower concepts

labelprovenanceconfidence
distributionisap:812053980.358237
transmissionisap:816156530.336660
loadisap:3102781550.093765