This paper introduced three research results on the coastal wind powered light system.
　Optimal design of coastal wind-Powered lights and battery system was investigated with consideration of topographical and time variation of wind characteristics by means of a field test and numerical simulations, as one typical example of on-site wind power utilization. Field test was conducted at the Kurihama-Coast faced to the entrance of the Tokyo-bay. The experimental system with a 12W powered light was set to operate daily 6 hours after sunset. Wind velocity and direction at the three points, light on-off signal, electric power generation rate, and battery voltage corresponding to the stored electric power were recorded continuously for eight months without interruption. Threedimensional wind characteristics were numerically simulated to estimate topographical wind distribution.
　Concentrator system was also studied by a series of model experiments in order to make most use of the wind power acting to the wind fan. Results of the tests showed the optimal conditions of the concentrator locations and dimensions.
　Wave overtopping forces acting on the pole of the wind powered light and guard fences were also studied applying the calculation method of the wave force on the superstructure of the breakwater or sea-wall. It was concluded that the structurally resistive design against wave forces must be considered as well as the load generated by wind.