8 Main Renewable Energies
The technological development of Renewable Energies is increasing and offers many varieties of clean and inexhaustible energy. Its potential is enormous and some experts believe that the union and development of all its varieties could well cover the energy needs of all humanity. Here the eight main renewable energies are highlighted and explained: biofuels, biomass, wind, geothermal, hydro, and solar and wave and tidal.
Biofuels use materials as diverse as cereals or discarded oils to make an alternative fuel to petroleum derivatives. Fermentation of various plants to convert them into usable alcohol as gasoline is called bioethanol, while those based on oil are biodiesel.
Renewable Energies are the logical and ecological alternative to fossil fuels. Biomass is the set of organic waste generated by society, from the consumer’s trash bag to agricultural, livestock or forestry waste, biomass is known as renewable energy.
Wind technology is one of the most consolidated renewable energies and the one with the most potential for development in the coming years. Large wind turbines have become part of the landscape of many Spanish regions, although they have also had an environmental impact for birds in some cases.
Geothermal energy is produced from the heat inside the Earth. The superficial geothermal energy goes from zero to about 300 meters and from there it is called deep geothermal. Geothermal can be used in large facilities, capable of producing several megawatts (MW), or in district heating, a type of central heating for a building but for an entire city.
Mini hydropower plants use the strength of river flows to produce energy and, like their “big sister”, have important advantages and disadvantages. Large dams produce 20% of the world’s electricity and 7% of total energy.
The sun’s energy is exploited in many ways. The photovoltaic panels on the roofs are the best known, but the technological evolution has achieved four generations and several varieties. Solar thermal power is used in domestic and large power plants to produce electricity and heat. Thanks to it, heating is obtained, water is heated in homes, pools, food is cooked or products are dried.
7 and 8. Undimotor and tidal wave
Wave technology harnesses the energy of wave movement. Several prototypes are tested in countries such as Portugal, Norway or Spain. On the other hand, the force of the tides is also postulated as another renewable energy, the tidal, although like the wave it needs a greater development to be competitive.