The invention relates to a wind power installation consisting of a wind power machine and having an axis of rotation arranged essentially in the direction of the wind and an electric generator arranged on the same axis of rotation. In this arrangement, a first wind wheel 1 is provided in front of a generator housing 3 in the direction of the wind and a second wind wheel 2 is arranged behind it in the direction of the wind. The two wind wheels act as a counter-rotating twin drive to drive the generator by means of counter-rotating excitation (operating, field) coils. <IMAGE>
