Abstract: In a system comprising an asynchronous generator rotatable at variable speeds, and a main electrical network carrying power at a substantially constant voltage and frequency, the improvement comprising a synchronizer having an electronic optimization controller connected in circuit between the generator and the network, the synchronizer being capable of receiving electrical power at variable voltages and frequencies from the generator and controllably and continuously injecting the power into the network at substantially constant voltage and frequency. A method for optimizing the generation of electrical power into the mains is also claimed.