From the view of energy development strategy, human
must seek the road to sustainable development of energy.
With economic development and the improvement of living standard, there has been increasing emphasis on the improvements in the living conditions of human, and their awareness of environmental protection. Human urgently
need some new energy sources which are clean, nonpolluting and renewable. Developing and using renewable energy becomes a strategic choice. In fact, compared to coal, oil and other fossil fuel energy, some other energy such as water power, solar energy and wind power have much larger energy reserves. Theoretically, the solar energy that the entire earth absorbs in ten days exactly equals to all the world's energy reserves of fossil fuels[1].
The maximum utilization of the Earth's wind power is estimated to 1.3_1011kW. It is obviously much larger than the water power with 2.9_109kW. Statistics show that the useable wind energy can be four times larger than the total energy consumption in 1998[2]. Meteorologists
estimated that about 1% of the solar energy received by earth was converted to wind energy. According to relevant statistics of the 1980s, only 1% of wind energy (0.01% of solar energy) was able to meet the energy need of the globe[1,3]. It can be predicted that the energy structure of the 21st century will undergo fundamental change. The traditional energy with fossil fuels as the main energy will be replaced by solar energy, wind energy, biomass energy, nuclear fusion and other new energy.
Currently, about 85% of 12 trillion watts of energy consumption come from fossil fuels. To slow global warming, in the middle of this century, global primary energy will reach the aim without carbon dioxide emission.
And then alternative energy outputs are three times of the current global energy consumption. Recently, many countries are setting down their energy plan. The European Union has announced that regenerative energy
utilization will account for 50% of the whole electrical power production until 2050.