A wind driven turbine device is disclosed that includes a housing having an air inlet and an air outlet, a turbine rotor having a plurality of radially distributed turbine rotor blades mounted in the housing for rotation in direct response to atmospheric wind to thereby generate rotary power, a baffle arrangement is also provided for directing wind through the housing from the air inlet to contact the turbine rotor blades from behind as internal driving wind. The rotor is mounted in a manner such that the rotor blades are driven both by a combination of direct external wind and internally directed wind.