achieve the expected aerodynamic efficiency even though the transversal lateral interval is shorter than the interval for the transversal lateral arrangement of the wind power generation units whose blades rotate in the same direction moreover if pitch control is carried out in order to increase or maximize the aerodynamic efficiency by reducing or minimizing interaction of the spiral flow according to a predetermined transversal lateral interval because size and rotational strength of the spiral flow generated by the rotation of the blades can be controlled effectively aerodynamic efficiency can be increased or maximized at a predetermined transversal lateral interval furthermore as shown in fig1 because an interaction range of the spiral flow can be controlled when the directions of the rotary axes of the wind power generation units are individually and properly controlled through yaw control embodiments of the present disclosure can reduce or prevent vibration and improve or optimize aerodynamic efficiency at a predetermined longitudinal back and forth interval and transversal lateral interval by the same token the transversal lateral arrangement of the wind power generation units whose blades rotate in the same direction may keep a sufficient transversal lateral interval from the wind power generation units installed laterally but the transversal lateral interval can be reduced or minimized in the wind power generation units which are installed in the transversal lateral arrangement because the rotational direction is set in the opposite direction to the wind power generation units neighboring laterally and.