The purpose of this study is to compare the condition and development prospects of the wind power sector in Poland and Ukraine. Our research is based on reports and studies prepared by industry organizations associating wind generating companies and wind farm equipment manufacturers. For Poland, the Energy Regulatory Office (Urząd Regulacji Energetyki - URE) and Central Statistical Office (Główny Urząd Statystyczny – GUS) were the principal sources of data. Wind farming industry has developed considerably both in Poland and Ukraine, however the installed capacity growth was significantly higher in Poland. The combined installed capacity of wind farms in Poland in 2017 exceeded more than ten times the combined installed capacity of similar facilities in Ukraine. In 2017 the capacity growth in Poland visibly decelerated. In Ukraine 2017 was another year of growth in wind farming. According to public sources, new wind farms with the capacity in excess of 300 MW are to be commissioned in Ukraine in the nearest future. In Poland, large wind farms are about to be commissioned on the Baltic Sea.