If we want to reach our goal of supplying heat, electricity and mobility mainly with renewable energy already by 2050, we have to reinvent the grid as well as the business models and invest in research to fill some significant technological gaps.  One of the approaches where these exact three pillars come together is the so called bidirectional charging technology and vehicle-to-grid (V2G) systems.  V2G not only helps to reduce the climate impact of mobility. But also offers massive economic advantages. But what exactly is behind it and what role does V2G play in the context of the new energy world? We discuss this today with Prof. Dr. Göhlich from the Mobility2Grid research campus in Berlin.