• 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. Musk said the move could help change the "entire energy infrastructure of the world”.
  • The system is called Powerwall, and Tesla will sell the 7kWh unit for $3,000 (£1,954), while the 10kWh unit will retail for $3,500 (£2,275) to installers. Tesla plans to start shipping the units to installers in the US by this summer.

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