Ansaldo Energia has produced more than 500 hydrogenerators since 1920 and many of them are still in operation.
Hydrogenerators have an extremely wide range of rotational speed depending on individual site condition. Due to this range (usually 50 - 1200 rpm), the construction configuration of the shaft and bearings, diameter and structure of the rotor, have a several possibility.
Ansaldo Energia currently produces three basic types of hydrogenerators both for new plants and in service application:
Generators for river flow (low/medium speed);
Generators for high-head plants (medium/high speed);
Motor-generators for pumped storage systems.