SolarSolar is a popular alternative energy source. The panel is made up of photovoltaic cells. These cells collect energy from the sun. Solar panels were first invented in 1839. But recently have picked up momentum. Now solar is cheaper than fossil fuels. Also after purchasing they will save money and pay them selves off.
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Sources-
http://www.renewableenergyworld.com/index/tech.3.leftinheritedbottom_standard.html
http://www.energymatters.com.au/panels-modules/
http://www.ewea.org/wind-energy-basics/faq/
http://energy.gov/eere/wind/advantages-and-challenges-wind-energy