SylWin1
OperationalOffshore GridDE864 MW320 kV205 km2015
Basic information
8 fieldsAlso Known As
SylWin 1 · SylWin1 offshore grid connection · SylWin1 HVDC link · Netzanbindung SylWin1
Status
operational
Capacity
864 MW
Owners
Project Company
Type
offshore grid
Transmission Model
TSO Build & Own
Website
Supply Chain (7)
Project Timeline (6)
19 Mar 2025Procurement Other
TenneT awarded Bluestream Offshore (OEG Energy Group) a contract for retrofit installation of an ICCP corrosion protection system on the SylWin alpha offshore converter platform. Work execution date not yet announced.
Apr 2015Commercial Operations Full Power
SylWin1 grid connection system commissioned and operational.
28 Apr 2015First Power
Prysmian Group announced the successful commissioning of the SylWin1 HVDC offshore grid connection after Siemens handed the project over to TenneT, indicating that the ±320 kV, 864 MW link had been energised and was able to transmit power along its approximately 205 km cable route between the SylWin alpha offshore converter platform and the onshore converter station at Büttel, Germany.
2014Cable Installation Complete
By 2014, Prysmian Group had completed installation of the cable systems for TenneT’s SylWin1 offshore HVDC grid connection in the German North Sea, including the 155 kV HVAC submarine cables linking the SylWin1 converter platform to the DanTysk, Butendiek and Sandbank offshore wind farm transformer platforms, as part of a €280 million project executed over the 2012–2014 period. The completed system uses Prysmian’s extruded HVDC cable technology together with Siemens’ HVDC Plus converters to form an 864 MW, ±320 kV link of about 205 km (160 km offshore and 45 km onshore) between the offshore assets and the onshore converter station at Büttel in northern Germany.
Jan 2011Cable Supplier Selected
In January 2011, Prysmian Group secured the SylWin1 HVDC offshore grid connection project in the German North Sea as part of contracts awarded to consortia between Prysmian and Siemens Energy, making Prysmian responsible for supplying and installing the extruded ±320 kV HVDC submarine and land cable system of about 205 km total route length, as well as 155 kV HVAC submarine cables linking the offshore wind farm transformer platforms to the SylWin alpha converter platform; the SylWin1 cable contract with TenneT is reported with an execution period of 2012–2014 and an approximate value of €280 million.
Jan 2011Converter Supplier Selected
In January 2011, Siemens Energy, partnering with Prysmian Group in a consortium, was awarded the role of converter technology supplier for the SylWin1 offshore grid connection, providing its HVDC Plus voltage-sourced converter systems on the offshore SylWin alpha platform and at the onshore Büttel converter station for the ±320 kV, 864 MW HVDC link in the German North Sea.