There wouldn't be the need to use open spaces to build solar farms if everyone placed solar panels on their roofs. Now, thanks to technology developed by Dow Chemical Co., that possibility is closer to reality. Dow has developed a roof shingle that doubles as a solar panel, made of thin-film cells of copper indium gallium diselenide. Since they can be installed by roofing contractors with no specialized solar panel skills, the cost of using your roof as a power plant has never been cheaper.
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