How does green wind power get from the North Sea coast to the south? To master the energy turnaround, invisible lines under the earth are planned. But construction of electricity highways is costly and elaborate - 40-metre-wide safety swathes have to be made through the countryside. A new option has been opened up by the technology of the start-up AGS-Verfahrenstechnik, whereby the power line is fed into a water-filled empty pipe system. The advantages: in the future the underground cables can be laid along the highways such that they save space. In addition, the cooling prevents the soil from warming up and thus having a negative impact on farming.