On 18 December 2025, Asso.subsea announced it had secured a series of major contracts from Nexans for subsea cable installation and protection works across TenneT’s 2 GW transmission programme, including LanWin2. For LanWin2 and the sister projects, Asso.subsea will carry out more than 650 km of offshore burial and over 60 km of nearshore laying and burial between 2027 and 2031, using its cable‑laying vessel Atalanti and trenching support vessels to perform jetting, mechanical trenching, and associated survey operations, as well as loading and transporting Nexans’ submarine cables from Norway for nearshore and beach landing works.
On 15 January 2025, Nexans and TenneT signed the project‑specific agreement for the LanWin2 offshore grid connection in Germany, confirming Nexans as the cable EPCI contractor under the earlier framework. The EUR 1 billion contract covers the engineering, procurement, construction, and installation of about 250 km of 525 kV HVDC XLPE onshore and offshore export cable systems to transmit 2 GW of offshore wind power from the German North Sea to the mainland grid connection point in the Heide area of Schleswig‑Holstein, with commissioning expected in 2030.
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LanWin2 is a 2 GW high-voltage direct current (HVDC) offshore grid connection being developed by the transmission system operator TenneT to bring North Sea offshore wind to the German mainland. The scheme uses the 2 GW / ±525 kV HVDC standard and will collect AC output from nearby wind farms at a...
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By mid‑January 2025, TenneT had designated the Siemens Energy–Dragados Offshore consortium to build the offshore converter platforms for LanWin2, alongside BalWin3 and LanWin4, as part of its 2 GW offshore grid connection programme in the German North Sea. The consortium will deliver the HVDC converter platform infrastructure required for LanWin2’s 2 GW connection from the offshore wind area to the German mainland grid.
BNetzA confirmed LanWin2 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 multi‑year 525 kV HVDC cable system framework agreements worth about EUR 5.5 billion to NKT, Nexans, and a consortium of Jan De Nul, LS Cable, and Denys, covering multiple German and Dutch grid connection projects including LanWin2. Under this frame, Nexans was given an initial commitment, valued at around EUR 1.7 billion for three projects including LanWin2, to provide full EPCI services for subsea and land cables using its 525 kV DC technology, thereby designating Nexans as the framework cable provider for the LanWin2 offshore grid connection from the German North Sea to the Heide area in Schleswig‑Holstein.
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 LanWin2 was confirmed in January 2025.
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