The mood around tech is dark these days. Social networks are a cesspool of harassment and lies. On-demand firms are producing a bleak economy of gig labor. AI learns to be racist. Is there anyplace where the tech news is radiant with old-fashioned optimism? Where good cheer abounds? Why, yes, there is: clean energy. It is, in effect, the new Silicon Valley—filled with giddy, breathtaking ingenuity and flat-out good news.

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