A proton exchange membrane (PEM) hydrogen fuel cell, king-size.
The heat harvested from the reactions required to turn hydrogen into electricity will be used by Fujitsu in the buildings too. Right now, the fuel cell system is 50 percent efficient. That puts it on par with conventional power plants; with conventional systems, over half of the power gets lost in transmission lines or as waste heat before it gets to your house. By capturing more heat, the efficiency of the fuel cell can be raised to 85 percent, says UTC.
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