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Intermittency may be a problem for an individual wind farm or solar power plant, but a diverse array of renewable energy systems—coupled with storage in the form of batteries or hydrogen tanks—apparently wouldn't suffer such issues.

A study by researchers at the University of Delaware modeled how well renewables could sustain a big chunk of the U.S. grid—72 gigawatts worth, where the entire country has a capacity just north of 1000 GW—and found as high as 99.9 percent reliability at reasonable costs.