In regions where offshore wind is becoming the backbone generation source, it must also support system resilience. The BLADE research project shows that offshore wind can provide cost effective system restoration services, but current regulatory and market arrangements exclude variable generations sources. BLADE is developing proposals to evolve regulatory and market arrangements to unlock the full benefits of offshore wind for system resilience.

Background

As power systems transition away from conventional synchronous generation, system restoration must evolve to remain resilient in high‑renewable scenarios. The BLADE project (Black start Demonstration from Offshore Wind), funded under Ofgem’s Strategic Innovation Fund, demonstrates how offshore wind farms (OWFs), coordinated with grid‑forming battery energy storage systems (BESS), can credibly and economically contribute to system restoration in Great Britain (GB).

This analysis focuses on regulatory and economic findings, evaluating OWF and BESS restoration pathways against conventional dispatchable generation. The methodology combines bottom‑up cost modelling, probabilistic analysis of historic offshore wind availability, and regulatory assessment against existing Electricity System Restoration Standards, Grid Code provisions, and market procurement rules.

Market and regulatory analysis

Results show that OWFs are excluded from current restoration markets due to high availability requirements, despite being capable of delivering sufficient active power during a substantial proportion of the year. When availability requirements are redefined to reflect inherent renewable variability, OWFs coordinated with grid‑forming BESS can provide restoration services at costs comparable with incumbent providers. System‑wide benefits include avoided thermal plant warming and increased restoration optionality, with avoided warming costs for a large OWF exceeding contractual costs by factors of three to ten.

BLADE finds no fundamental regulatory barriers to OWFs providing restoration services, but highlights key risks around cost allocation for offshore transmission assets, treatment of non‑standard availability, and operational governance during restoration events. These findings point to a need for targeted evolution of restoration market definitions and procurement frameworks rather than radical changes to grid codes or asset technical standards.

Conclusions

BLADE has established a robust technical, economic, and regulatory evidence base demonstrating that OWFs can provide material system restoration value under future power system conditions. However, economic, regulatory, and operational challenges must be addressed. The final phase of BLADE will develop implementable restoration solutions, refined availability definitions, clarified cost recovery and asset boundaries, and practical operational, data, and testing requirements.