Wind power
The heat that the sun and the other stars give to the thermonuclear reaction is hydrogen, which is the main energy source of the universe. Hydrogen has the highest energy content per unit mass of all known fuels. 1 kg of hydrogen, 2.1 kg of natural gas or 2.8 kg of petroleum. However, volume per unit energy is high. In energy systems where heat and explosion energy is required and the use of clean, easy-to-use hydrogen is used as fuel in every field, the product in the atmosphere is only water and / or water vapor. Hydrogen is an average 33% more efficient fuel than petroleum fuels. There is no production of any gas or harmful chemical substances that increase pollutant and greenhouse effect outside of water vapor during hydrogen generation. Surveys show that hydrogen in present conditions is about three times more expensive than other fuels, and its use as a common energy source will depend on technological improvements in hydrogen production. However, storage of hydrogen as a surplus electric energy in daily or seasonal periods can be considered as a valid alternative for today. The widespread availability of energy stored in this way depends on the development of fuel cell-based automotive technologies, for example for public transport purposes. At present, about 50 million tons / 500 billion m3 of hydrogen are produced, stored, transported and used every year in the world. The largest user share is the chemical industry, especially the petrochemical industry. Perhaps the most important feature of hydrogen is that it is storable. As is known, today there is still no convenient method for storing energy in large quantities. If it were possible to store energy from hydroelectric power plants today, it would have been possible to solve the energy problem to some extent. However, the best known storage method for electric energy is still nothing but acidic accumulators. Hydrogen can be stored in tanks pure as gas or liquid, or physically stored in carbon nanotubes or chemically as hydrides. Hydrogen can be stored as gas or liquid in suitable steel tanks. However, due to the high pressure in storage as a gas, tank weights are a problem. Perhaps the cheapest method of storing a hydrogen gas is to store the natural gas in a similarly underground, depleted oil or natural gas reservoir. If the cost is somewhat high, it is to store the mine in the caves in the hearth. Hydrogen covers 4 times more volume than petroleum; It is necessary to store hydrogen in liquid form to reduce the volume of the hydrogen-coated volume. This requires a high pressure and cooling process. Liquefied hydrogen can be stored in steel tubes under high pressure. This method is the most widely used method for medium or small scale storage. However, it is a rather expensive method for large quantities. Because about ¼ of the hydrogen energy must be spent for fluidization. Another practical solution is to store liquid hydrogen in low temperature tanks. In space programs, liquid hydrogen, which is used continuously as rocket fuel, is stored by this method. The largest liquid hydrogen tank in the world is at the Kennedy Space Center and can receive 3400 cubic meters of liquid hydrogen. This amount is equivalent to 29 million Mega Joules or 8 million kW-hours as hydrogen fuel. The work done in recent years can also be stored in hydrogen carbon nanotubes. Carbon nanotubes are briefly transformed into tubular shapes of graphite plates. Diameters are several nanometers, or 10-20 nanometers, and the length is micron.