The results of studies on determining the speed of a wind power plant and calculating the wind energy utilization coefficient of a rotating cylinder constant cross-section with a smooth surface are presented. With the help of experimental and theoretical methods, studies of the main aerodynamic characteristics the efficiency of a wind power plant with blades in the form of rotating cylinders were carried out. The changes in the aerodynamic parameters of the flow were 2 m/s and higher. The results showed that the value of the wind energy utilization coefficient decreases with an increase in the speed of the incoming flow. It is experimentally established that the value of the speed a wind power plant decreases with an increase in the Reynolds number.