Abstract: A wind turbine with a single rotor blade drives an alternator whose output is connected to an a-c network to supply same with power when the alternator acts as a generator under the driving force of the wind. The network establishes a synchronous speed for the alternator which corresponds to a rotor speed so chosen that a certain laminar flow along the blade will be maintained even at high wind velocities. Changing the pitch of the blade allows a wide range of wind velocities to be accommodated.