A move which could help change the “entire energy infrastructure of the world”. That’s the boast of Elon Musk chief executive of Tesla Motors.

The chief of the US electric car maker has announced the firm will build batteries that store solar energy and serve as a back-up system for consumers during blackouts and allow them to get off a power grid.

Tesla will sell the 7kWh (kilowatt-hour) unit for around 3,000 dollars while the 10kWh unit will retail for about 3,5000 dollars to installers.

Deutsche Bank reckons the sale of battery storage systems could yield as much as 4.5 billion dollars for Tesla.