It is estimated that the annual solar energy radiated to the earth is 1.78 billion kilowatts, of which 500 to 100 billion degrees can be exploited. However, because of its scattered distribution, it can be used very little at present. Geothermal energy resources refer to the total caloric content of rocks and water bodies within a depth of 5,000 meters. Among them, the high-temperature geothermal energy resources within a depth of 3 km and above 150 °C in the global land area are 1.4 million tons of standard coal. At present, some countries have started commercial development and utilization. The potential of the world's wind energy is about 350 billion kilowatts. Because of the intermittent dispersion of wind power, it is difficult to use it economically. If there is a major improvement in energy storage technology in the future, wind power utilization will increase.
Ocean energy can include tidal energy, wave energy, sea temperature difference, etc. The theoretical reserves are considerable. Limited to the technical level, it is still in the small-scale research stage. At present, due to the immature use of new energy, it only accounts for a small part of the total energy required by the world, and there is a great development prospect in the future.
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