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Solar energía is a renewable energy, obtained from the use of electromagnetic radiation from the sun. The solar radiation reaching the Earth has been harnessed by humans since ancient times, using different technologies that have evolved. Currently, heat and sunlight can be exploited by various collectors and photovoltaic cells, heliostats or thermal collectors, it can be transformed into electrical or thermal energy. Is a so-called renewable energy or clean energy, which could help solve some of the most pressing problems facing the humanity. 

The various solar technologies can be classified as passive or active depending on how they capture, convert and distribute solar energy. Active technologies include the use of photovoltaic panels and thermal collectors to collect the solar energy. Among the passive techniques, different techniques framed bioclimatic architecture are: the orientation of buildings to the Sun, selecting materials with favorable thermal mass or having properties for light scattering, and the design of spaces through ventilation natural

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In 2011, the International Energy Agency said that "The development of clean, cheap and inexhaustible solar technologies will be a huge long-term benefit. It will increase the energy security of countries by using a source of local, inexhaustible energy and, more importantly, whether imports, increase sustainability, reduce pollution, lower the costs of climate delcambio mitigation, and prevent excessive rise prices of fossil fuels. These advantages are global. Thus, costs for incentive and development should be considered investments; must be carried out correctly and widespread "

The source of most developed solar energy today is photovoltaic solar energy. According to reports by Greenpeace, solar photovoltaics could supply electricity to two-thirds of the world population in 2030

Thanks to technological advances, sophistication and economy of scale, the cost of photovoltaics has declined steadily since the first commercial, solar cells turn increasing efficiency were made, and the average cost of power generation is already competitive with energies not renovables5 in an increasing number of geographical regions, reaching parity red. Other solar technologies such as solar thermal energy is also reducing costs considerably.