Developments in Regional Offshore Transmission Planning and Coordination

Offshore infrastructure is evolving rapidly with ±525 kV HVDC emerging as the typical voltage level for interconnection. This supports transfer capacities of ~2 GW, aligns with security‑of‑supply requirements, and provides a basis for greater standardisation across

Original Equipment Manufacturers (OEMs) and jurisdictions. However, moving beyond pointto-point systems, multi‑terminal control and protection approaches are technically complex and technology and interoperability standards are still developing. Technologies such as full‑bridge

Modular Multi-Level Convertors (MMCs) and hybrid DC circuit breakers (as they become commercially available and tractable) enable more selective DC fault management but with trade‑offs in footprint, cost and operational complexity. Innovation programmes including

Ready4DC, InterOPERA and Aquila Lite are defining shared specifications, modelling frameworks and procurement approaches that will be essential for future interoperability.

Regulatory frameworks must evolve to reflect hybrid offshore assets as shared infrastructure rather than generation‑specific or interconnector‑specific extensions. Clarity on cost recovery Paris Session 2026

August 23 to 28

Palais des Congrès, Paris, France for anticipatory investments, design coordination obligations, and operational incentives is required for developer and investor confidence. Emerging regimes in Great Britain and the EU highlight promising foundations but remain incomplete.

Commercially, cross‑border pricing and market access involve more risk for hybrid assets at present as do misalignments in development milestones such as seabed leasing. Robust delivery models that support multi‑party delivery coordination and greater alignment of programme and investment milestones are essential to avoid delays and unlock supply‑chain scalability.

Overall, achieving a reliable and efficient interconnected offshore grid requires integrated progress across technology, regulation, and commercial frameworks. This paper provides a structured assessment of these interdependencies, challenges and learning to date and highlights steps needed to scale.