Assertion: wind turbine | /r/CapableOf | operate at constant speed
Facets:
value: exactly
type: DEGREE
value: as of 2003
type: TEMPORAL
Source sentences:
text: As of 2003, nearly all grid-connected wind turbines operate at an exactly constant speed (synchronous generators) or within a few percents of constant speed (induction generators).
text: As recently as 2003, nearly all grid-connected wind turbines operated at exactly constant speed (synchronous generators) or within a few percent of constant speed (induction generators).