E-cars store excess wind energy, save CO2

March 05, 2020 //By Christoph Hammerschmidt
E-cars store excess wind energy, save CO2
Electric power transmission system operator Tennet, car manufacturer Nissan and technology company The Mobility House have completed a major Vehicle-to-Grid (V2G) pilot project to save renewable energy. The project investigated the potential of electric vehicle batteries to store and feed back locally produced electricity in order to stabilize the power grid while increasing the use of renewable energy and saving CO2.

The project offers a solution for a central challenge in Germany’s energy market: Due to the decentralized feed-in of renewable energies (46% in 2019), there are transport bottlenecks in the power grid. To prevent this, Tennet has to reduce the generation of renewable energy in the north of Germany and at the same time increase conventional power generation in the south at high cost - an expensive matter, especially at peak loads.

To prevent this, the wind power available in northern Germany was used by electric cars in the region. At the same time, in the south, electricity from fully charged batteries of Nissan Leaf electric vehicles was fed back into the power grid instead of cranking up fossil fuel generation. The mobility and charging requirements of vehicle users were taken into account. Thus, the use of renewable energies could be increased and a shutdown of wind power in the north with high cost or valuable energy losses could be avoided.

These intelligent redistribution measures were controlled by software from The Mobility House, the charge and energy management system ChargePilot, which is based on Tennet specifications. After analysis of the participants, the pilot project showed that electric mobility can be used in the future to flexibly control renewable power production, which is highly dependent on the weather. "This relieves the strain on the power grid and helps us to limit the expensive shutdown of wind turbines. The short-term flexibility that electromobility provides us with in this way can complement grid expansion and become an important building block of the energy turnaround," said Tennet Managing Director Tim Meyerjürgens.

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