PAUL RAPSON / SCIENCE PHOTO LIBRARY PAUL RAPSON / SCIENCE PHOTO LIBRARY
Solar energy systems. Solar heating tubes (top) and an array of photovoltaic (PV) modules on a house rooftop. A passive solar water heating system comprises individual evacuated glass tubes (EGT) that absorb energy from the sun to heat water. PV modules generate electricity from sunlight. Photographed in the UK.
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