Battery battle: The scientist vs the market

If solar is to be an unstoppable force a lot hangs on the economics of batteries, and I’m hearing and seeing different things. The US government's chief renewable energy scientist is sceptical but Silicon Valley's SunPower reckons they know better.

Is solar an unstoppable force that is on the cusp of unleashing a wave of Schumpeterian creative destruction through technological superiority that incumbent power companies are powerless to resist? 

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