# 525 kV Subsea HVDC Interconnectors Commissioned to Anchor North Sea Offshore Wind Supergrid

> Next-generation 2 GW 525 kV voltage source converter (VSC) transmission corridors begin operations, unlocking cross-border gigawatt-scale offshore power wheeling with reduced line losses.

- **Publish Date:** 2026-03-08
- **Category:** transmission-substations
- **Reading Time:** 4 min
- **Original Source Citation:** [ENTSO-E & European Offshore Grid Initiative](https://www.entsoe.eu)
- **Tags:** HVDC, Offshore Wind, Subsea Cable, VSC Converters, 525 kV
- **Canonical URL:** https://voltformer.com/news/hvdc-subsea-interconnectors-offshore-wind-grid
- **Markdown Source:** https://voltformer.com/news/hvdc-subsea-interconnectors-offshore-wind-grid.md

## The Transition to 525 kV Extruded XLPE Cable Systems

European transmission system operators have achieved a critical milestone with the energization of the first multi-terminal 525 kV DC extruded subsea cable systems. Upgrading from conventional 320 kV links more than doubles transmission capacity per cable pair to 2,000 MW.

These high-capacity HVDC corridors connect deep-water offshore wind clusters directly into high-inertia onshore nodes across the United Kingdom, Netherlands, and Germany, mitigating regional onshore bottleneck constraints.

## Modular Multilevel Converters (MMC) for Grid Forming Stability

The onshore and offshore converter platforms integrate advanced Modular Multilevel Converter (MMC) topologies equipped with grid-forming control algorithms. Rather than relying on physical synchronous generators for frequency reference, the converters actively synthesize voltage vectors.

This ensures robust grid stability, synthetic inertia, and fault ride-through performance during severe AC grid disturbances.

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