Costs of solar electricity generation are falling quite a bit faster than those of any other major renewable, and solar has the most headroom to grow. The closest competition to solar in price declines is wind, but solar has been falling roughly twice as fast as wind over the past five years.[227] Further, solar has a lower potential floor because materials science advances directly translate to cheaper and more efficient panels, and current technology captures only a fraction of the theoretical maximum—typically somewhere around 20 percent of incoming energy out of a theoretical limit around
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