In Western Tibet in China, solar energy resources is the richest with the highest level of 2333KWH/㎡ and radiation of 6.4KWH/㎡ per day,second only to the Sahara desert.
According to the different radiation levels, we can divide our country into five areas.
The first area is that with the richest solar energy resources. It includes Northern Ningxia, Northern Gansu, Southern Xingjiang, Western Qinghai, Western Tibet, etc. In these places, annual solar energy resource reaches up to 6680 to 8400MJ/㎡,equal to the radiation level of 5.1 to 6.4KWH/㎡ per day.
The second area is that with relatively rich solar energy resources. It includes Northwestern Hebei, Northern Shanxi, Southern Inner Mongolia， Southern Ningxia, Middle Gansu, Eastern Qinghai, Southeast Tibet, Southern Xingjiang, etc. In these places, annual solar energy resource reaches up to 5850-6680MJ/㎡，equal to the radiation level of 4.5 to 5.1KWH/㎡ per day.
The third area is that with medium solar energy resources. It includes Shandong, Henan, Southeastern Hebei, Southern Shanxi, Northern Xinjiang, Jilin, Liaoning, Yunnan, Northern Shanxi, Southeastern Gansu, Southern Guangdong, Southern Fujian, Northern Anhui, Southwestern Taiwan, etc. In these places, annual solar energy resourc is 5000 to 5850MJ/㎡，equal to the radiation level of 3.2 to 3.8KWH/㎡ per day.
The fourth area is that with relatively poor solar energy resources. It includes Hunan, Hubei, Guangxi, Jiangxi, Zhejiang, Northern Fujian, Northern Guangdong, Southern Shanxi, Northern Jiangsu, Southern Anhui, Heilongjiang, Northeastern Taiwan, etc. In these places, annual solar energy resource is 4200 to 5000MJ/㎡，equal to the radiation level of 3.2 to 3.8KWH/㎡ per day.
The fifth area is that with the poorest solar energy resources. It includes Sichuan and Guizhou. In these two provinces, annual solar energy resources is 3350 to 4200MJ/㎡，equal to the radiation level of merely 2.5 to 3.2KWH/㎡ per day.
Nationally speaking, China is a country with relatively rich solar energy resource.Annual solar radiation on average is above 4 KWH/㎡ in majoriry areas, among which Tibet has the highest level of 7KWH/㎡.