Chief executive Elon Musk announced the firm would build batteries that store solar energy and serve as a back-up system for consumers during blackouts. The device would allow consumers to get off a power grid or bring energy to remote areas that are not on a grid. Tesla plans to start shipping the units to installers in the US by this summer. In a highly anticipated event near Los Angeles, Mr Musk said the move could help change the "entire energy infrastructure of the world". "Tesla Energy is a critical step in this mission to enable zero emission power generation,"...
