# 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
- **Reading Time:** 4 min
- **Original Source Citation:** [TenneT TSO & EnBW](https://www.tennet.eu)
- **Tags:** Offshore Wind, Substations, North Sea, TenneT, 66 kV Array, HVAC Interconnection
- **Canonical URL:** https://voltformer.com/news/north-sea-offshore-wind-substations-he-dreiht-borkum-riffgrund
- **Markdown Source:** https://voltformer.com/news/north-sea-offshore-wind-substations-he-dreiht-borkum-riffgrund.md

## 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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