To date, most studies have focused mainly on the wind turbine itself and have failed to discuss the differences between the turbine and power plant. An entire wind power plant is in fact the smallest and most basic functional object in assessing the environmental impact of wind power. Each wind power plant includes wind turbines and transmission parts (internal cables, transformer stations and external cables). Thus, CO2 emissions from a wind power plant will be higher than the sum of the individual wind turbines installed in the plant as there are additional emissions from the transmission parts. However, the difference between them varies from case to case. Fig. 3 shows CO2 emissions per kWh attributed to turbines and transmission in case 2 and case 3.