TenneT’s DolWin Kappa Platform Takes Flight


The DolWin kappa offshore platform, part of the DolWin6 grid connection project, has left the Dragados shipyard in Cadiz, Spain, and is on its way to the port of Rotterdam in the Netherlands.

Source: TenneT

After three years of construction, the platform was loaded onto the transport barge iron Lady on August 5 and headed for the Port of Rotterdam where it will be reloaded onto the Allseas Rig Installation Vessel Pioneering spiritwhich is already in port, according to the vessel’s AIS data.

From there, the DolWin kappa platform will be shipped to the installation site in the German North Sea.

The platform consists of a foundation structure and an upper part which have a combined height of approximately 82 meters. Once installed, DolWin kappa will rise approximately 53 meters above the surface of the North Sea.

Source: TenneT

In addition, DolWin kappa will be connected to DolWin beta (DolWin 2 network connection system), which has already been put into operation in 2016, via a bridge in order to effectively use the already existing infrastructure of the mother platform, said TenneT.

The well-thought-out construction of the offshore platform conserves important resources while minimizing environmental impacts,” said Tim MeyerjurgensCEO of TenneT.

Spain’s Dragados Offshore is responsible for the design, supply, construction, transport and installation of the platform, the centerpiece of the 900 MW DolWin6 HDVC connection, while Siemens will supply the set of technology for the DolWin6 connection, as well as the design and construction of the terrestrial connection conversion platform in Emden.

On the DolWin kappa platform, the three-phase current generated by the offshore wind farms is converted into direct current and transported to Hilgenriedersiel on the mainland via an approximately 45 kilometer long submarine cable.

From the landing in Hilgenriedersiel, the electricity is transmitted to Emden via another 45 kilometer land cable where the land converter station and a transformer station will convert the direct current back to three-phase current and feed it into the onshore power grid .

TenneT plans to go live with the DolWin6 connection in 2023.

The DolWin6 will be TenneT’s 13th offshore grid connection system in the German North Sea for the transmission of wind energy from sea to land.

A few months ago, the transmission system operator invited all potential and interested market players to express their interest in the planned market study for the DolWin6 HVAC cable systems that will connect the DolWin kappa platform to the parks wind turbines the Areas N-3.7 and N-3.8 in Group 3, and provide an overview of the current status of the planning documents.

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