Fig. 2 shows the distribution of solar energy resources in China. The high value center and low value center of solar energy both lie between about 22 and 35 north latitude, and the high value center located on Qinghai–Tibet Plateau.
Seen from the locations of annual total solar radiation, the amount in western region is higher than it in eastern region.
At the same time, the amount in southern region is basically lower than it in northern region except Tibet and Xinjiang. In addition, we can see from Table 1 the area where the annual total solar radiation per square meter is larger than 5000 MJ and the sunshine hours are larger than 2200 h accounts for more than 2/3 of the national territory area of China. Especially in the northern China and northwest China, the sufficient sunshine provides good conditions for the utilization of solar energy resource. So it will meet the national energy demand if 1% of the annual total solar radiation is converted to available resource in China