By National Wind Watch Solar panels, wind farms and hydropower facilities contributed 80 percent of the energy on the largest portion of California’s power grid on May 13, a record for renewable energy sources. But can wind, solar and hydroelectric power sustain an entire electric grid full-time? The debate over when a fully-renewable energy grid will be possible continues with a study published Monday in the Proceedings of the National Academy of Sciences by researchers representing more than a dozen schools and research institutions . . .
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