Abstract: A vertical axis wind turbine (10) comprises two turbine rotors (12) and (13) with a plurality of curved blades (14) and (15) and coupled together by gears underneath their shafts and rotating synchronously in opposite directions, a multi-function center enhance (16) with three sections namely, the front deflector (21), the upwind blade cavity (22) and the turbulence reducer (23) and together with the two side deflectors (17) and (18) contribute to the efficient flow of the wind stream to the downwind moving blades (28) and (29) of the two turbine rotors. The center enhance separates the two turbine rotors on opposite sides. The wind turbine (10) has a cylindrical housing structure (11) with two levels of horizontal platform (19) and (20) housing various components of the machine, and a yaw drive mechanism that orients properly the machine into the wind.