EntityQ1364228· pop 12· linked from 128 articlesemergency power systemSign in to saveindependent backup source of electrical power that supports important electrical systems on loss of normal power supplyConnectionselectrical generatorEntityTransfer switchEntityWorld War IIConcepthydrogenEntityInternational Standard Book NumberEntityhospitalEntitytelecommunicationsEntitytransformerEntitydiesel engineEntityfuel cellEntitysteam turbineEntitygas turbineEntitygasoline engineEntityuninterruptible power supplyEntitydata centerEntityinverterEntityelectric power transmissionEntitylead–acid batteryEntitypower outageEntitystarterEntityCategoriesElectric powerFault tolerance