The aim of this work is to evaluate the efficiency of the system "steel tower -reinforced concrete foundation -foundation ground" of a wind power unit with power more than 2 MW using computer simulation in ANSYS. For this purpose, an example of a wind power unit is taken from the previous work, but in this case the lower part of the tower up to height of 20 m was filled with B60 concrete. The second distinctive feature of the presented wind power unit is the use of a collapsible foundation, which was manufactured according to our patent. The simulation takes into account the spatial reaction of elements of the structural system and the physical nonlinearity of the materials from which they are made. In this case, for steel the von Mises theory of strength was used, for concrete the Williams-Varnack theory was used, and for ground base the Drucker-Prager theory was used. Comparison of the obtained results with data of previous work showed that the breaking load of tower has increased by 57% due to filling the lower part of the tower by concrete, which indicates the efficiency of the proposed solutions.