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SOLAR ENERGY
For solar energy means energy, heat or electricity produced directly using the energy radiated from the Sun (renewable) to Earth. At any time the earth's orbit the Sun transmits 1367 watts per mē. The amount of solar energy that reaches the earth's soil is so huge, about ten thousand times better than all the energy used by humanity as a whole, but not very concentrated, in that it is necessary to collect energy from very large areas in order to have a significant amount, and quite difficult to convert into energy efficiencies easily exploitable acceptable. For its operation generally requires expensive products that make solar energy much expensive than other methods of generating energy. The development of technologies that can make economic use of solar energy is a very active area of research but, for now, had no revolutionary results.