In general, wind energy in coastal area is larger than in inland area. Demand of electric power is also large in coastal area. Even if the wind mill height is restricted by the airport regulation, medium size wind power system is likely to be used as the electric power of port and airport. In order to satisfy these electric demands, we developed the medium size wind power system. We also investigated its application of this medium size wind power systemto the coastal area.
　Wind energy distribution in Japan is clarified by Nagai (2002), finding that the wind energy in Tokyo bay is large enough to be applied to proto-type power generation system. However, observed wind data in Tokyo bay is not sufficient to design real field wind power system. From these points of view, we conducted following
investigations.
1) Development of medium size wind power system applicable to coastal area.
2) Field test in Tokyo bay.
3) Application of the wind power system to sand bypass.
4) Application to the area in which the large size wind mill is difficult to construct.
　Following results were obtained from this study.
1) Field experiment of the medium size wind power system was conducted at the eastern side of Tokyo bay and relations of the wind speeds at the front and back of the wind power wings were investigated with the generated electric power.
2) Possibility of the on-site wind-power energy application to a sand-by-pass system was investigated.
3) Field installation possibility of the developed medium size wind power system was studied using the GIS map information.