The share of the total energy mix of conventional power plants feeding alternating current into the grids is dwindling. Power generation from wind and solar power plants is clearly on the rise. These plants feed direct current - which must pass through an inverter - into the grid, but the conversion causes considerable losses which makes the entire system inefficient. Industry and research are therefore currently working intensively on the testing of DC technologies. Reinhausen has already developed extensive know-how in this area – at all grid levels.