What are the 6 types of new energy sources?

[McFinn]

New energy sources can be classified into the following categories, with specific details as follows: 1. Classification by formation and source: Energy derived from solar radiation, such as solar energy, hydro energy, wind energy, and bioenergy. Energy originating from within the Earth, such as nuclear energy and geothermal energy. Celestial gravitational energy, such as tidal energy. 2. Classification by development and utilization status: Conventional energy sources, such as hydro energy and nuclear energy. New energy sources, such as bioenergy, geothermal energy, ocean energy, solar energy, and wind energy. 3. Classification by attribute: Renewable energy sources, such as solar energy, geothermal energy, hydro energy, wind energy, bioenergy, and ocean energy. Non-renewable energy sources, such as nuclear energy. 4. Classification by conversion and transmission process: Primary energy sources, which are directly obtained from nature, such as hydro energy, wind energy, nuclear energy, ocean energy, and bioenergy. Secondary energy sources, such as biogas, steam, thermal power, hydropower, nuclear power, solar power, tidal power, and wave power.