Two weeks ago, electric car company Tesla announced it will debut a new line of storage batteries for homes and businesses, sparking widespread enthusiasm for an energy revolution. Consumers, it seems, are on board. In an earnings call last week, Tesla CEO Elon Musk revealed that more than 38,000 of the home-focused Powerwall units had been reserved in the first week after the announcement—that means they're sold out until mid-2016. As a refresher, the Powerwall is a six-inch thick shield-like pack that measures three feet by four feet in size and stores electricity generated from solar or other renewable sources for use at night or as a backup supply.
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