Panagis Zissimatos a country man from a small village in Kefalonia island at Greece, at the end of 19th century he starts to experiment new ways in the cultivation of his land. And because of his efford he is considered as the first person to deal we solar energy. The sun water heater started for use after the oil disaster of the 1970s, and mainly inside the Nineteen Eighties commenced to be widely utilized in countries with sunshine. in cyprus there’s a sun water heater for each five inhabitants, even as in israel their use is obligatory in new homes. in lots of different nations their use is backed. In greece the unfold of solar appliances is very brilliant: the first model changed into released in 1974, in 1980 there had been about one hundred and fifty thousand rectangular meters of collectors mounted and in 2004 about three million rectangular meters of collectors. a part of the success of solar water heaters in greece is due to the monetary incentives introduced by the greek country. nowadays, sun water heaters are used by greater than a million customers. till the previous couple of years, greece has been one of the primary manufacturers of sun water heaters. Sun electricity is the era used to harness the sun’s strength and make it useable. as of 2011, the generation produced much less than one 10th of one percent of global electricity call for. Many are familiar with so-known as photovoltaic cells, or sun panels, found on things like spacecraft, rooftops, and handheld calculators. the cells are manufactured from semiconductor materials like those observed in computer chips. when sunlight hits the cells, it knocks electrons unfastened from their atoms. because the electrons waft through the cellular, they generate power. On a miles larger scale, solar-thermal electricity plant life hire various strategies to pay attention the solar’s power as a heat supply. the heat is then used to boil water to power a steam turbine that generates power in an awful lot the identical fashion as coal and nuclear electricity plants, providing electricity for thousands of people. In a single method, long troughs of u-formed mirrors cognizance daylight on a pipe of oil that runs thru the center. the hot oil then boils water for electricity technology. another approach makes use of moveable mirrors to cognizance the solar’s rays on a collector tower, in which a receiver sits. molten salt flowing via the receiver is heated to run a generator. Different sun technology are passive. for instance, massive home windows positioned on the sunny side of a building permit sunlight to warmness-absorbent substances on the ground and walls. these surfaces then release the warmth at night time to maintain the building heat. in addition, absorbent plates on a roof can warmth liquid in tubes that supply a residence with warm water. Sun electricity is lauded as an inexhaustible fuel source this is pollutants- and regularly noise-free. the era is likewise versatile. for example, solar cells generate electricity for far-out locations like satellites in earth orbit and cabins deep within the rocky mountains as effortlessly as they can electricity downtown homes and futuristic cars. Solar energy does not paintings at night without a garage tool together with a battery, and cloudy weather can make the generation unreliable in the course of the day. sun technology are also very costly and require a whole lot of land location to accumulate the sun’s energy at quotes beneficial to masses of humans. Notwithstanding the drawbacks, sun power use has surged at about 20 percent a 12 months over the last 15 years, thanks to hastily falling expenses and profits in performance. japan, germany, and the usa are foremost markets for solar cells. with tax incentives, and green coordination with strength companies, solar electricity can frequently pay for itself in 5 to 10 years.