An array of photovoltaic cells on a roof.

An array of photovoltaic cells on a roof.

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Credit: MAXIMILIAN STOCK LTD/SCIENCE PHOTO LIBRARY

Caption: Solar panels. Array of photovoltaic cells (solar panels) on a roof. The cells contain a semicon- ducting material which converts sunlight directly into electricity. Solar power is a renewable source of energy and does not contribute to global warming. As photovoltaic cells do not work in low light, residences which use solar power must have a reserve power supply, such as batteries which store excess power during the day. Photographed at the Schwarzwald-Einoedhof "Rappenecker-Hof" near Freiburg, Germany. The houses in this research project have all their power needs met by a combination of solar power and energy-saving devices.

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Keywords: alternative energy, energy efficiency efficient, environmentally friendly green, house, industry, panel, photovoltaic cell, renewable energy, roof, solar, solar cell, solar energy, solar panel, solar panels, solar power, sun, technology

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