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14 May 2015 at 22:39 GMT
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Renewable power billionaire Elon Musk has introduced his sleek new Powerwall – a wall-mounted energy storage unit that can hold 10 kilowatt hours of electric energy, and deliver it at an average of 2 kilowatts, all for $3,500. That translates into an electricity price (including installation and inverters) of $500 per kWh – less than half current costs, as estimated by Deutsche Bank. A domestic system plus storage would come out ahead of coal-fired power from the grid. Musk is going to manufacture the batteries in the US. He is not waiting for new technology, but scaling up the tried and tested lithium-ion battery used in his electric vehicles.
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28 July 2014 at 8:56 GMT
US data may have been skewed by the weather at the start of the year, but June's durable goods boost to USD 240 billion adds weight to the belief that the economy is set fair for a strong push into the end of the year.
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