In theory, EV owners can allow utility companies to tap the stored electricity in their batteries. The utility reimburses them for the electricity much the same way it pays customers with rooftop solar systems for any excess electricity generated and fed back into the grid.

Volkswagen sees things differently. On March 12th, Michael Jost, chief strategist for the German car company, told journalists in Berlin that electric car batteries could be used to stabilize the energy grid by charging the battery in times of excess supply and selling electricity back to the grid at times when supplies of electricity from wind and solar power are low, according to a report by The New York Times.
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