Update on the DolWin5 Grid Connection and Borkum Riffgrund 3 Offshore Wind Farm
DolWin5 Grid Connection
Offshore Submarine Network Linking DolWin Epsilon Oil Platform to Mainland Successfully Set Up
The DolWin5 offshore grid connection, operated by TenneT, is nearing completion. The final cable link between the offshore converter platform DolWin epsilon and the German mainland was successfully laid in July 2025 [1][2]. The connection to the German national grid is scheduled for later this year [2][3].
The DolWin5 grid connection boasts a capacity of 900 MW, utilizing extra-high voltage technology for efficient transmission [2][3]. The project involves the use of an offshore converter platform (DolWin epsilon) that converts alternating current generated by offshore wind farms into direct current. The subsea cable installation was managed by Prysmian under a turnkey Engineering, Procurement, Construction, and Installation (EPCI) contract [1].
Borkum Riffgrund 3 Offshore Wind Farm
The Borkum Riffgrund 3 offshore wind farm, located in the North Sea, is part of a larger offshore wind development supported by grid connections like DolWin5. Although specific installation dates, power capacity, and technology details for the wind farm are not readily available, it is known that the wind farm consists of 83 Siemens Gamesa 11 MW turbines [4].
The installation of wind turbines at Borkum Riffgrund 3 was completed in January this year. The offshore grid connection uses extra-high voltage direct current (HVDC) transmission technology. The subsea cable from DolWin epsilon to Hamswehrum, on the German mainland, measures 100 kilometers in length.
Prysmian delivered the connection under an EPCI contract with TenneT, which includes design, procurement, construction, and installation. At Emden/East, the direct current (DC) will be converted back into three-phase AC and fed into the extra-high voltage grid on land.
With a capacity of 913 MW, Borkum Riffgrund 3 is Germany's largest offshore wind farm [5]. The cable installation was carried out by Prysmian using Jan De Nul's vessel Isaac Newton. From Hamswehrum, a 30-kilometer-long onshore cable leads to the converter station in Emden/East. The export cable connecting the DolWin epsilon platform to land has been completed.
[1] TenneT Press Release - DolWin5 Cable Laying
[2] TenneT Press Release - DolWin5 Grid Connection
[3] Bundesnetzagentur Press Release - DolWin5 Connection to National Grid
[4] Borkum Riffgrund 3 Offshore Wind Farm Project Information
[5] Borkum Riffgrund 3 Offshore Wind Farm Facts
- The energy sector and finance industry are closely connected as projects like the DolWin5 Grid Connection and Borkum Riffgrund 3 Offshore Wind Farm require significant investments.
- As technology advances, the market for renewable energy sources, particularly offshore wind farms, is growing, with the DolWin5 Grid Connection and Borkum Riffgrund 3 Offshore Wind Farm being prime examples in the industry.
