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A year-long trial in Denmark is showing that utilities can use parked electric vehicles (EVs) as spare batteries, and those EVs can earn quite a bit of money for their owners from the utilities.
In an interview with Bloomberg New Energy Finance, Nissan Europe’s director of energy services Francisco Carranza said that a fleet of 10 Nissan e-NV200 vans has earned €1,300 ($1,530) over the year.
Electricity grids around the world are facing an era of rapid change as more electric vehicles hit the road and as grid supply changes.

For grid managers, sometimes small amounts of power are necessary to regulate current frequency and keep the grid working.

At the same time, if a lot of electric vehicles draw power from the grid at the same time (for example, when they’re parked at home at night, or when they’re parked at work during the day), that threatens to change how grid operators plan to meet demand, as well.
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