SAN FRANCISCO – Could you power the United States entirely from solar energy? Sure, claims tech entrepreneur Elon Musk.

The Tesla CEO, whose company provides solar panel solutions like the Solar Roof, shared a video via Twitter on Saturday of the electricity-generating tiles taking a beating from a hammer. One fan responded to Musk’s video with a 2011 quote from Bill Gates, who described solar and similar technologies as “cute,” but that the answer is in nuclear power.

Musk hit back at the quote by describing Gates’ assertion as “def wrong.”

It’s a revival of an idea Musk has shared several times, that enough solar panels could power the entire United States. It’s an idea he shared in 2015, and reiterated in 2017.

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