The article presents the research results of the power generated by the wind power plant equipped interchangeably with three different rotors. Testing was carried out on the mini power wind plant JSW 750-12 produced by KOMEL company. Operation of the rotor provided with the power plant and two new rotors of two-profile blades were analysed during the research. Profiles of NACA family were used for design of the first rotor's blades and GOE family profiles were used for designing the second rotor's blades. Testing was carried out in the aerodynamic tunnel, enabling the wind power plant analysis within the speed of 5 to 16 m·s -1. Additionally, during the research, wedge angles of rotor blades were modified. As a result, 15 characteristics of power were determined (power generated by the wind power plant as a function of wind speed). The use of new rotors of the power plant, enabled wind power plant to generate higher power than at the use of original factory rotors in the whole scope of wind speed. Suggestion of a new research direction, which would allow improvement of electric current generator structure and therefore lead failure-free operation of the electric power plant, is an additional effect.