In this study, the cost structure of the wind power generation system and the amount of CO₂ emission were clarified for the three-wing horizontal axis wind turbine, which is the mainstream of largescale onshore wind turbines. As a reference case, we designed a 2 MW-wind turbine with hub height of 80 meters and calculated the introduction cost and CO₂ emission of the wind power generation system. The results indicated that the cost of introducing the system was 140 yen/W, with the cost of the wind turbine making up about 60%. Raw material costs accounted for 79% of the manufacturing costs of the wind turbine. The ratios of costs of tower, rotor and nacelle were 30%, 30% and 40%, respectively. Fixed costs were 18% of the wind turbine manufacturing cost, of which about 40% was labor. CO₂ emissions were 690 g-CO₂/W. CO₂ emissions originating from raw materials and turbine components were more than 80%.
　We summarized the issues of the cost reduction technologies and evaluated the power generation cost by design, considering the selection of turbine components. In this paper, we evaluated the economics of wind power generation systems considering hub height and generator type. As the height of the hub increased, the cost of the wind turbine increased. However, the power generation cost decreased by 1 to 5% because of increasing utility rate of capacity. In addition, the wind turbine manufacturing cost increased depending on the type of generator, but the power generation cost decreased by about 2% when using direct-drive. In this way, a method for evaluating the cost structure for wind turbine technology was constructed.