According Global Wind Energy Council (GWEC) (2008) reported that turbine installation costs $ 47.5 billion; by contrast, we only have to spend a much smaller amount of money to build thermal power station about $ 2,25 billion (Shah 2011).
He also pointed that other incidental costs such as maintenance costs and production costs cause price increasing.
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In some circumstances, renewable energy can be more reliable than other forms of electricity.
For example, if the grid gets breakdowns, renewable energy technologies such as generators powered by photovoltaics (PV) can supply electricity automatically.On the contrary, renewable energy has little or no waste products such as carbon dioxide or other chemical pollutants.Renewable energy systems produce much lower carbon dioxide emissions as opposed to carbon-intensive fossil fuels such as oil, coal and natural gas while they are being used only a small amount of fuel during the manufacturing of equipment (Walser 2012).With renewable energies, energy is usually converted from one form to another without the creation of pollutants.Chandler (2006) takes solar energy an example, light energy from the sun can be converted directly to electricity using photovoltaic without the production of any pollutants like carbon dioxide or other greenhouse gasses.Essence of RES is derivation from natural processes so the energy is sustainable and never run out.Truly, renewable energy is really important and necessary to human beings when fossil fuels are more and more exhausted.According to Loir, there will probably be sufficient oil and gas for this century, and coal for 2 or more (Loir . Or Edwin Cartlidge reports “the annual total consumption of energy sources by the world population is about 1.4×1017 k Wh, of which the proportion of the fossil energy has accounted for 90% of the energy sources used” (Physics World 7/2007).Therefore, researchers around the world have been constantly trying to find solutions to diversify energy sources and reduce harmful emissions and greenhouse emissions into the environment and renewable energy sources have taken the spotlight. The Oxford Dictionary (2000) defines renewable energy as natural energy that can be used again and again and will never run out.Similarly, wind power energy relies on moving air and converts it into electricity without polluting the environment.Therefore, it is obvious that the non-pollution or minimal impacts on environment are the positive advantages of renewable energy.