The Tesla Powerwall can store power from solar panels, from the electricity grid at night when it is typically cheaper, and provide a secure backup in the case of a power outage. “The goal is complete transformation of the entire energy infrastructure of the world, to completely sustainable zero carbon,” Musk told reporters shortly before unveiling the Powerwall in a stylish warehouse space outside Los Angeles. All the power for the evening demonstration, attended by several hundred media as well as tech world participants, came from his new batteries, hooked up to solar panels on the roof, he said. Germany is seen as a key market for the product — which is about 6 inches thick, 4 feet tall and 3 feet across — because it has among the highest take-up of solar energy in the world, Musk said.
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