At present, the use of solar energy is not very popular. There are still problems of high cost and low conversion efficiency in using solar energy for power generation, but solar cells have been used to provide energy for satellites.

Human beings rely on these energies for survival, including all other forms of renewable energy (except geothermal energy resources). Although the total amount of solar energy resources is more than 10000 times the energy used by human beings, the low energy density of solar energy, which varies from place to place and from time to time, is the main problem facing the development and utilization of solar energy. These characteristics of solar energy will limit its role in the whole integrated energy system.

Solar energy is both primary energy and renewable energy. It is rich in resources and can be used free of charge without transportation, without any pollution to the environment. It has created a new form of life for mankind and brought society and mankind into an era of energy conservation and pollution reduction.