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Tesla Motors has found a way to apply the convenience of storage and portability to renewable energy . The Tesla Powerwall Battery lets people capture energy from green sources such as sunlight , wind and water , take it with them – and use it – whenever desired .

The battery comes in residential 7 or 10 kWh sizes and in a corporate 100 kWh size dubbed the “ Powerpack .” Companies can store mid-afternoon solar energy and use its power for the next day ’ s operations . Families can cut down significantly on their utility bills and enjoy nearly limitless clean energy .

While the Powerwall isn ’ t the first gadget of its kind , it may be one of the most affordable , with a current price of US $ 3,500 .

28 August 2015