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Plug Power sells fuel cells for forklifts to companies such as Procter & Gamble and Wal-Mart, which recently ordered 1,700 of the units. Photograph by Paul Castle

Fuel cells power way, way up

May 01, 2014

Brian Dumaine is a senior editor-at-large at Fortune Brian O'Keefe is an assistant managing editor at Fortune and co-chair of its Brainstorm E conference.

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