A wind power turbine, for generating electric energy, has a supporting structure (2); a nacelle (3); a blade assembly (5) rotating with respect to the nacelle (3); a first and second electric machine (9, 13) having, respectively, a first and second stator (10, 14), and a first and second rotor (11, 15) substantially coaxial with each other and fitted to the first and second stator (10, 14) to rotate about a first and second axis (A1, A2); and a transmission assembly (17; 48; 71) for connecting the first and second rotor (11, 15); the transmission assembly (17; 48; 71) being deformable.