Germany

Innovative Solutions for the energy transition in Germany.

Facts

• Project: SuedOstLink
• Range: ±525 kV
• Total lenght: 540 km
• Duration: 2023-2024
• Location: Saxony-Anhalt to Bavaria

The SuedOstLink is one of the key projects of Germany’s energy transition. The ±525 kV HVDC line will transport up to 2,000 MW of wind power from the north over a distance of approximately 540 kilometers to southern Germany—from Wolmirstedt in Saxony-Anhalt to the site of the former Isar nuclear power plant in Bavaria.

For the first 18 kilometers of the overhead line, MOSDORFER developed customized DC and V-string assemblies between 2023 and 2024 on behalf of 50Hertz. This included:

• Mechanical design and type testing of all components
• Load simulations and new connector and spacer damper solutions
• Newly developed composite insulators in cooperation with FCI
• Extensive mechanical and electrical testing, including endurance and thermal cycle testing at 120 °C
• Electrical validation in collaboration with Graz University of Technology
• Mechanical design and type testing of all components

In July 2025, Mosdorfer received the contract to supply fittings and composite insulators (contract value approx. €1 million). Construction is scheduled to begin in early 2026.n.