Electricity from a box in your backyard? Bloom Energy is making them for commercial businesses — they’re about the size of a parking space. The first ones (definitely business-sized) cost about $750,000 and can generate 100Kwh of electricity. But within a decade we may be able to buy these for our home. Bloom Energy CEO KR Sridhar claims that a Bloom box, which he calls an energy server, is twice as efficient as the electricity grid. “For the same amount of electricity, you need half the fuel,” he says. “If you use a renewable fuel you are carbon neutral. Use all the electricity you want and don’t feel guilty about polluting the environment.” [TechCrunch]

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