GE Vernova and Seatrium commenced works on BalWin5 2.2 GW HVDC converter platform. Fabrication at Seatrium yards in Singapore and Batam.
On 11 December 2025, TenneT awarded a major contract for the BalWin5 2.2 GW HVDC offshore grid connection to a consortium of GE Vernova and Seatrium. Under this contract, Seatrium will design and build the offshore converter platform and manage its transport and installation in the German North Sea, while GE Vernova will deliver the onshore and offshore converter stations and associated HVDC technology to transmit North Sea wind power into Germany’s electricity grid.
In 2024, TenneT issued a letter of allocation to a consortium of LS Cable & System, Jan De Nul, and Denys, designating them to supply the 525 kV HVDC cable systems for the BalWin5 offshore grid connection project in the German North Sea. The LOA covers design, manufacturing, transport, installation, protection, and testing of the export cables, positioning the consortium as the preferred cable supplier for BalWin5 under TenneT’s 2 GW program.
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BalWin5 is a next‑generation offshore HVDC grid connection being developed by the transmission system operator TenneT to transport large volumes of North Sea wind power to the German onshore network. The system is designed as a ±525 kV voltage‑sourced converter (VSC) HVDC link with a nominal capa...
Owners
NOR-9-4, BalWin Epsilon
BNetzA confirmed BalWin5 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.
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