Renewable energy. Wind. A wind turbine with a blade diameter of 21 m is to be installed in a location where average wind velocity is 5.6 ms 1. The overall efficiency of the turbine is 38% and average air density is 1.11 kg m 3. Determine the average electric power output in kW to three significant figures and enter the numerical value only (e.g. 0.0123, 0.123, 12.3, 123, but not 123 kW). Add your answer Question 7 10 Points