North Sea Offshore Transformer Platforms Energized for 960 MW He Dreiht and 913 MW Borkum Riffgrund 3
Transmission system operator TenneT and developers energize major offshore substation platforms in the German North Sea, integrating nearly 1.9 GW of subsidy...
North Sea Offshore Transformer Platforms Energized for 960 MW He Dreiht and 913 MW Borkum Riffgrund 3
Transmission system operator TenneT and developers energize major offshore substation platforms in the German North Sea, integrating nearly 1.9 GW of subsidy-free offshore wind power via 66 kV inter-array networks and high-voltage grid links.
- Publish date: 2026-09-10
- Category: Renewable Integration
- Original source: TenneT TSO & EnBW
- Reading time: 4 min
Commissioning 66 kV Array Substations for He Dreiht and Borkum Riffgrund 3
Offshore transmission operator TenneT, alongside energy developers EnBW and Ørsted, has energized the offshore converter and transformer platforms servicing the 960 MW He Dreiht and 913 MW Borkum Riffgrund 3 offshore wind farms in the German Bight.
The joint milestone connects approximately 1,873 MW of new clean generation capacity to the mainland extra-high-voltage transmission grid, delivering enough electricity to power over two million European households.
Direct Step-Up to EHV Transmission with Zero-Subsidy Generation Model
Both offshore wind farms operate on a subsidy-free merchant model, relying on next-generation 15 MW wind turbine generators and direct 66 kV inter-array submarine cable topologies to optimize levelized cost of energy (LCOE).
The offshore transformer substations house high-capacity 66/155 kV and 155/380 kV step-up power transformers, sulfur hexafluoride (SF6) gas-insulated switchgear, and advanced dynamic shunt reactors designed to neutralize cable charging currents along lengthy subsea export links.
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