This study developed a new simple and direct method for calculating CO2 emissions per kWh electricity produced by wind power plants. The results obtained herein confirm that wind energy produces the lowest CO2 emissions per kWh of electricity compared to fossil fuel and other renewable sources. Energy and metallurgy dominate CO2 emissions from material consumption. Among the four phases of the wind power plant’s life cycle, the production phase of wind turbines contributes most to the total emissions. Recycling during decommission is an important step, which theoretically can decrease the impact from the production phase by nearly half. Optimal management in the transport phase could reduce overall CO2 emissions by as much as 12% of the total emissions of a power plant, even with recycling. For countries with large wind potential and large territories, a large amount of CO2 emission could be saved in the transport phase. The result of a real case in China shows that with reasonable shorter transport routes, the related emissions could be reduced by 33%.