Assertion: turbine's generator | /r/HasAspect | low power ratings
Facets:
value: because of their inefficiency
type: CAUSE
value: because of the difficulty of insulating machines
type: CAUSE
Source sentences:
text: Because of their inefficiency and the difficulty of insulating machines that produced very high voltages, electrostatic generators had low power ratings, and were never used for generation of commercially significant quantities of electric power.