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Customer Success Story

SuedLink DC4

HVDC Light® transmission system will transfer vast amounts of renewable energy to up to 5 million households and help Germany achieve its 2045 carbon neutrality goal.

Hitachi Energy won a major order from TenneT and TransnetBW, two of Germany’s four transmission system operators, to supply a transmission solution for the SuedLink DC4 high-voltage direct current (HVDC) interconnection between the north and south of the country. 

SuedLink DC4 is one of the most important power grid and energy transition projects in Germany. It will play a critical role in Germany’s energy transition, enabling a reduction in the use of fossil fuels and helping the country achieve carbon neutrality by 2045.

Using Hitachi Energy’s HVDC Light® technology, SuedLink DC4 will transfer up to 2,000 megawatts of emission-free electricity, enough to power 5 million German households. The link will efficiently transmit electricity for 550 kilometers underground, at ±525 kilovolts, sending wind power from the north to the industrial south, or alternatively solar power from the south to the north when needed.

Hitachi Energy will supply an HVDC Light converter station at each end of SuedLink DC4 to convert AC power from the transmitting grid to DC for delivery through the link, and back to AC for transfer to the receiving grid. The contract includes three cable section stations to speed up fault detection in the link.

As part of its long-term commitment to Germany’s energy transition, Hitachi Energy has recently won or completed orders for solutions that integrate large-scale renewables. These include the converter stations for the NordLink HVDC interconnector between Germany and Norway, the converter stations for the connection of the 900-megawatt DolWin5 offshore wind farm in the German North Sea, the Kriegers Flak Combined Grid Solution which connects the German and Danish power grids with two offshore wind farms in the Baltic Sea, and power quality solutions to enable more renewable energy to flow from north to south Germany.

Main data

Commissioning Year



HVDC Light® converter system

Power Transmitted

2,000 megawatts

Direct Voltage 

±525 kilovolts


DC links in AC grids