New energy generally refers to renewable energy developed and utilized on the basis of new technologies, including solar energy, biomass energy, wind energy, geothermal energy, wave energy, ocean current energy and tidal energy.
In addition, there is hydrogen energy and so on. Energy sources that have been widely used, such as coal, oil, natural gas, hydropower and nuclear fission energy, are called conventional energy sources.
According to their sources, energy can be divided into the following four categories:
The first category comes from solar energy. In addition to direct solar radiation energy, fossil fuels such as coal, oil and natural gas, as well as biomass energy, hydropower, wind energy, ocean energy and other resources are indirectly derived from solar energy.
The second is geothermal energy stored in the earth's interior in the form of heat energy, such as underground hot water, underground steam, dry hot rock mass, etc.
The third category is nuclear fission energy such as uranium and thorium and nuclear fusion energy such as deuterium, tritium and lithium on the earth.
The fourth category is the gravity of the moon, the sun and other stars to the earth, and the energy mainly produced by the gravity of the moon, such as tidal energy.