Solar cells on the roof of a Swiss building

Solar cells on the roof of a Swiss building


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Solar cells. Array of solar cells (photovoltaic cells) on the roof of a building. The cells contain a semiconducting material which converts sunlight directly into electricity. Solar power is a renewable, inexhaustible source of energy and does not contribute to global warming. As solar cells do not work in low light, buildings which use solar power must have a reserve power supply, such as batteries which store excess power during the day. Solar energy is relatively cheap, as once the panels are installed, they continue to produce electricity indefinitely. Photographed on the Union Bank of Switzerland administration building near Lugano, Switzerland.

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