Bloom Energy's Fuel Cell Breakthrough

The Silicon Valley green startup is selling power by the watt, with no up-front cost

With its compact fuel cells that can generate electricity with low carbon emissions, Bloom Energy is one of the most hyped companies among Silicon Valley's growing roster of green startups. Bloom unveiled its generator on 60 Minutes last February and boasts A-list investors (John Doerr of Kleiner Perkins Caufield & Byers), board members (Colin Powell), and customers (Google, Coca-Cola).

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