The compact transmission line for direct current high voltage (DC CTL) is an underground cable based on existing technology but now used for direct currents.
Siemens said it could be used in Germany to carry power from the wind-rich north and offshore projects to the centre and south of the country. Plans to move the technology to other countries was "possible".
The group said the new transmission cable would be capable of carrying up to 5GW of electricity, is more environmen-friendly, and cheaper.
"Gas-insulated DC lines can handle the power from an overhead line with the same number of conductors. This means that the substations and transmission corridors can be designed to take up less space, which makes them more cost-efficient," Siemens explained.
Siemens also said the transmission network in Germany needs to be expanded to reach a target of 80% of electricity demand provided by renewable sources by 2050.
The project led by Siemens also included the Berlin Technical University and the Dresden University of Applied Sciences. The German government provided €3.78 million to support the project.
In August, Siemens revealed its first compact gas-insulated switchgear for high-voltage direct-current applications, which it claims could reduce the size of offshore wind converter platforms by 10%.