By Steve Goreham
Which is more environmentally friendly — an energy source that uses one unit of land to produce one unit of electricity, or a source that uses 100 units of land to produce one unit of electricity?
The answer should be obvious.
Nevertheless, “green” energy advocates call for a huge expansion of wind, solar and other renewables that use vast amounts of land to replace traditional power plants that use comparatively small amounts of land.
Vaclav Smil, professor emeritus at the University of Manitoba in Canada, extensively analyzed the power density of alternative sources used to generate electricity. He defined power density as the average flow of electricity generated per square meter of horizontal surface (land or sea area).
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