Why the solar-plus-battery revolution may be closer than you think

In late April, Tesla Motors took a step toward upending home energy when it announced the Powerwall, a battery for homes that can provide backup power, and that was paired with higher capacity versions for businesses and even power companies. Within about a week of the announcement, Bloomberg reported, the company had already pulled in $800 million worth of orders, with the vast majority of revenue not for individual home batteries but rather for larger...

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