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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.
Efficient storage media such as batteries and fuel cells are keys for a renewable-powered grid.
If battery storage is added to the system, it can supply electricity even after the sun goes down or through several cloudy or stormy days (Pasolini 2012).
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.
Finally, renewable energy not only is regarded as an unlimited resource but also plays an important role to regional development.
Renewable energy and energy efficiency can help revitalize rural communities (Parker 2010).
The use of renewable energy has many potential benefits, including human beings and environment.
Firstly, renewable is one of the most important advantages of renewable energy.