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(Natural News) Solar power may be one of the cleanest forms of energy, but affordable and efficient it is not. According to SolarPowerAuthority.com, a five-kilowat solar panel system can set you back at least $25,000, while an $18,000 system can have a payback period of approximately 20 years. Fortunately, some people are working to change... |
Scientists close to achieving over 20% efficiency for dye-sensitized solar cells
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