JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Rooftop wind energy system analysis. Power curve for wind energy turbines in development by Swift. Here, wind velocity (metres per second, horizontal axis) is plotted against the power output (watts, vertical axis). The use of these turbines is known as microgeneration. They generate carbon-free or low-carbon heat and power for individual businesses and communities. Wind power is a renewable and clean source of energy for electricity production. Photographed in Edinburgh, Scotland, UK.
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