An In-depth Comparison: Solar Power vs. Wind Power
And if the wind turbine lasts 10 years, then each kWh of power costs $0.20. Meanwhile, for solar systems, you will need a 7 kW system to produce the same amount of power. And the national average cost of installing solar is 3.08 per watt, thus making the cost of a 7 kW system $21,480 before the 30% tax credit.