GE Vernova-Seatrium consortium secures major HVDC contract from TenneT
- December 12, 2025
GE Vernova and Seatrium today announced that their consortium has been awarded a contract by TenneT to deliver a major part of BalWin5, a new 2.2-GW offshore HVDC grid connection.
This HVDC connection is designed to transmit electricity from offshore wind farms in the German North Sea to the onshore transmission network in Germany.
Once operational, BalWin5 is expected to provide enough renewable electricity to power approximately 2.75 million households. BalWin5 is one of TenneT’s 2 GW projects.
This contract is the fourth project awarded to the GE Vernova-Seatrium consortium under the five-year Framework Cooperation Agreement with TenneT announced in March 2023. It is also the consortium’s first win concerning TenneT’s German 2-GW projects.
Scope of work
As part of the contract, GE Vernova’s Electrification Systems business is expected to deliver the onshore and offshore converter stations and the complete HVDC technology, including the advanced control and protection systems that help maintain stable and secure operation across the transmission network.
Seatrium is responsible for the design and construction of the offshore converter platform and will manage transportation and installation in the German North Sea. Works are scheduled to commence on 1 January 2026, with majority of platform fabrication taking place at Seatrium’s yards in Singapore and Batam.
BalWin5
TenneT’s BalWin projects are a series of large offshore grid connections designed to transport electricity from wind farms in the German North Sea to the onshore grid.
The connection is being designed to carry up to 2.2 GW of wind power to homes and businesses, allowing Germany to make better use of the large offshore wind farms operating in the North Sea. (The additional 200 MW or 0.2 GW above the standard 2-GW design comes from building the system with enough technical headroom to transport more power when wind conditions allow.)
The system will include an offshore converter station in the North Sea, an onshore converter station at Bremen-Werderland, and a combined 325-kilometer sea and land cable system. Commissioning is planned for 2032.
Also read: GE Vernova and Seatrium Consortium awarded third HVDC contract by TenneT