Electric vehicles owners are selling their excess capacity back to the power grid in Denmark — earning as much as $1,530 a year.

Nissan and Enel, the country’s largest utility, are carrying out a trial project to see the role that cars like the Nissan Leaf can play in helping balance out supply and demand during peak demand hours.

It’s also pointing EV owners to another income source through the sponsored program.

The trial project is tied into utilities transitioning over to more renewable energy to meet government mandates. The two companies are watching to see how EV owners tend to charge their cars, and how it can impact variable flows that make using energy like wind and solar more costly.

“If you blindingly deploy in the market a massive number of electric cars without any visibility or control over the way they impact the electricity grid, you might create new problems,” said Francisco Carranza, director of energy services at Nissan Europe.

Fleet operators in Denmark are participating in the trial, he said.

Nissan has more than 100 cars in trials around Europe.

SEE ALSO:  Nissan in UK Follows Tesla Powerwall By Letting EV Owners Sell Energy to Utility

In the UK, the automaker needs to raise the number to 150 EVs in operation before qualifying for payments received from utilities by sending power back to the grid. That may happen before the end of this year, Carranza said.

“It’s feasible,” he said. “It’s just a matter of finding the appropriate business model to deploy the business wide-scale.”

EVs are expected to draw a lot more energy in years to come, putting a lot more pressure on utilities to supply without jacking up monthly bills or seeing a wave of blackouts hit the grid.

Electricity consumption from vehicles will grow to 1,800 terawatt-hours in 2040 from just 6 terawatt-hours now, according to Bloomberg New Energy Finance.

Automakers are continuing to look for opportunities to find revenue models in side businesses such as energy storage – whether that means using a parked electric car or setting up lithium ion battery pack storage stations.

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