On 11 December 2025, Greek offshore contractor Asso.subsea secured multi-project contracts from Nexans for subsea cable installation and protection on TenneT’s 2 GW transmission programme, including LanWin4, covering more than 650 km of offshore cable burial and over 60 km of nearshore laying and burial between 2027 and 2031 using the cable-laying vessel Atalanti and dedicated trenching systems.
By 15 January 2025, a consortium of Siemens Energy and Dragados Offshore had been selected to build the offshore converter platforms for three of TenneT’s 2 GW grid connections in the German North Sea, including LanWin4 alongside BalWin3 and LanWin2, providing the offshore HVDC conversion infrastructure for these links to the German grid.
On 5 June 2024, Friedrich Vorwerk Group SE and its subsidiary Bohlen & Doyen were awarded by cable manufacturer Nexans the contract to realise the onshore underground cable connections, each around 45 km long, for the BalWin3 and LanWin4 offshore grid connection projects from the Lower Saxony landfall to the future converter station in Wilhelmshaven, as part of an overall project with a total order volume in the clear three-digit million range.
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LanWin4 is an offshore direct‑current grid connection project developed by TenneT to bring North Sea wind power to the German onshore grid. It is part of TenneT’s 2 GW programme of high‑capacity offshore grid connections and is intended to support large‑scale integration of renewables and securit...
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On 19 March 2024, Nexans announced it had secured the first call-off under TenneT’s 2GW framework agreement, an Engineering, Procurement, Construction and Installation (EPCI) contract for the high-voltage direct current (HVDC) cable systems for the BalWin3 and LanWin4 offshore grid connection systems transmitting power from the North Sea to Wilhelmshaven in Germany.
BNetzA confirmed LanWin4 in Netzentwicklungsplan (NEP) 2037/2045 (2023) on 1 March 2024. This confirmation under §12c EnWG creates the legal basis for the responsible TSO to plan, procure, and construct the offshore grid connection system.
BNetzA confirmed the Netzentwicklungsplan Strom 2037/2045 (2023 edition) on 1 March 2024 under section 12c of the German Energy Industry Act (EnWG). This confirmation creates the legal basis and obligation for the responsible TSO to plan, procure, and construct this offshore grid connection system. For regulated German TSO offshore grid connections, the BNetzA NEP confirmation functions as the de facto Final Investment Decision: unlike merchant or developer-led projects that require a separate board-level investment decision and financial close, the NEP confirmation simultaneously authorises and obligates the TSO to invest. Costs are recovered through the offshore grid levy (Offshore-Netzumlage). The NEP 2037/2045 (2023) schedules 25,980 MW of offshore transmission capacity across 16 grid connection systems for commissioning between 2026 and 2032.
On 5 May 2023, TenneT awarded Nexans a major contract under its 2 GW programme to provide the 525 kV HVDC cable connections for BalWin3 and LanWin4, both landing at Wilhelmshaven, as well as LanWin2 in Lower Saxony, with an initial value of about EUR 1.7 billion for more than 2,160 kilometres of subsea and land cables including full EPCI scope.
On 20 April 2023, TenneT officially signed the framework agreement with the Siemens Energy/Dragados consortium covering BalWin3, LanWin2 and LanWin4. The project-specific call-off for LanWin4 was confirmed in January 2025.
In November 2022, TenneT launched a large-scale tender for 525 kV HVDC cable systems covering fourteen offshore and one onshore corridor projects, a portfolio that includes the LanWin4 2 GW offshore grid connection, as part of its multi-year 2 GW programme in Germany and the Netherlands.
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