Foundations laid for DolWin6 converter station
The foundation stone has
officially been laid for the DolWin6 onshore converter station in Emden
/ Ost. A time capsule with coins, a regional daily newspaper and construction
plans were inserted in the construction site area of the onshore
An onshore station is an essential element for connecting offshore wind
farms to the grid. The DolWin6 project includes a high-voltage direct current
(HVDC) transmission of 900 MW from the wind farms at sea to the extra-high
voltage grid in Emden / East.
The wind power produced at sea off the coast of Lower Saxony is fed as
three-phase current to a offshore converter platform from TenneT, where
it is converted into direct current and transported a total of 90 kilometres
to the converter station onshore in Emden / Ost. Here, the electricity
is converted back to a three-phase current and fed into the extra-high
voltage grid via the substation. Because of the distance and the power
to be transmitted, direct current is ideal for low-loss transport.
The converter station is being built in several construction phases on
an area of 23,500 square metres. Due to the soil conditions, a deep
foundation was required for the entire construction project. ~24 metre-long
bored piles were used to transfer the building load into lower, stable
Siemens has been commissioned to construct the offshore platform as well
as the onshore converter station and install all electrical engineering
systems. As another contractor, Nexans has been tasked with delivering
and connecting cables to connect the platform at sea to the station on
land. The laying of the cables will also begin in the summer of this year.
With the DolWin6 project, wind farms with a transmission capacity of up
to 900 MW can be connected to the grid from 2023. DolWin6 is one of the
three current offshore grid connection projects that TenneT is currently
implementing. Twelve network connections are already in operation with
a capacity exceeding 7 GW.
For more information on offshore wind
farms worldwide, click