Fuel Cells as energy storage

Hydrogen Fuel Finally Graduating From Lab to City Streets - Bloomberg: "The shift to hydrogen is inevitable, and it’s happening faster than we expected,"

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Cars that run on hydrogen can typically go more than 250 miles (400 kilometers) on a tank of the gas and then must be refilled. 

Near-term  forecasts:

“In three to five years you will see that become more prevalent,” Beckman said. “Wind and solar can make hydrogen cheap when the grid doesn’t need the power.”