Solar energy is a kind of renewable energy. It refers to the heat radiation energy of the sun, and its main performance is the sun light. In modern times, it is generally used to generate electricity or provide energy for water heaters. 

(1) Universal: the sun shines on the earth, no matter the land or the sea, no matter the mountains or islands, they are everywhere. They can be directly developed and utilized, which is easy to collect, without mining and transportation.

(2) Harmless: the development and utilization of solar energy will not pollute the environment. It is one of the cleanest energy sources. It is extremely valuable in today's increasingly serious environmental pollution.

(3) Large-scale: the solar radiation energy reaching the earth's surface every year is about 130 trillion tons of coal, which is the largest energy in the world.

(4) Sustainable: according to the estimation of the rate of nuclear energy generated by the sun, the storage of hydrogen is enough to maintain tens of billions of years, and the life span of the earth is about billions of years. In this sense, the energy of the sun is inexhaustible.