In view of growing global warming crisis, utilization of wind energy, as sustainable natural energy, has been promoted worldwide especially in Germany, Spain, USA, Denmark, etc. Recently in Japan, wind energy development has been strongly promoted in view of (1)high appraisal value of clean wind energy, (2)favorable economical prospect by increased generator capacity and (3)positive financial status by governmental subsidiary or support. Our company has supplied and installed more than 50 units of wind turbine of 1500kw in Japan for the last years. Our wind energy development and promotion activity are presented herein.