Wind power turbine comprising a tower (11), a supporting frame (41) and a drive train including a rotor hub (13), a main shaft (21) supported by a front bearing (43) and a rear bearing (45), a generator (31), located at an opposite side to the rotor hub (13) with respect to the tower (11), with a generator shaft (23) rigidly connected to the main shaft (21), and a coupling element (39) between the generator housing (33) and the supporting frame (41) which is placed in a plane substantially coincident with a perpendicular plane (Y-Z) to the main shaft (21) axis (X) in the center of the rear bearing (43) and it is made so that it allows displacements of the generator housing (33) in the direction of the main shaft (21) axis (X) but blocks turning displacements of the generator housing (33) with respect to the main shaft (21) axis (X).