What is the primary purpose of seabed clearance in offshore wind development?

Seabed clearance is a critical safety and engineering phase designed to remove physical obstacles such as boulders, debris, and unexploded ordnance (UXO) from the seafloor. Clearing these hazards ensures that jack-up vessels can position themselves safely and that turbine foundations and subsea cables can be installed without structural interference or costly equipment damage.

Who is developing the East Anglia Two offshore wind farm and what is its capacity?

The project is being developed by ScottishPower Renewables, which is part of the Spanish utility giant Iberdrola. Once completed, the East Anglia Two wind farm will have an installed capacity of up to 900 MW, contributing significantly to the UK's target of reaching 50 GW of offshore wind capacity by 2030.

How does this project affect the offshore marine services supply chain?

This campaign highlights the intense competition for specialized subsea vessels and offshore expertise, which are shared between the offshore wind and traditional oil and gas sectors. As more mega-projects enter the construction phase simultaneously, developers face potential bottlenecks and rising day rates for high-specification vessels equipped for UXO clearance and heavy boulder relocation.

Offshore Energy · June 22, 2026 (Jun 22) · 1 min read

OEG clearing seabed at East Anglia Two OWF site

Analysis

AI-assisted analysis · reviewed by Yuri Kan

OEG Renewables has commenced critical pre-construction seabed clearance operations at the East Anglia Two offshore wind farm site in the UK North Sea. This campaign represents a vital preparatory phase, mitigating subsea hazards and unexploded ordnance (UXO) to ensure safe foundation installation. The mobilization highlights the growing demand for specialized offshore marine services as European offshore wind build-outs accelerate.

Key Facts

OEG Renewables has been contracted to perform seabed clearance and boulder removal operations at the East Anglia Two offshore wind farm site.
The East Anglia Two project is located in the southern North Sea, off the east coast of England.
The scope of work involves identifying and clearing seabed obstructions, including boulders and potential unexploded ordnance (UXO), prior to main construction.
This campaign follows previous site investigation works, marking a transition from assessment to active site preparation.
The developer of the East Anglia Two offshore wind farm is ScottishPower Renewables, a subsidiary of Iberdrola.
The project has a planned capacity of up to 900 MW, enough to power approximately 800,000 UK homes once fully operational.

Background & Context

The East Anglia Two project is part of ScottishPower Renewables' larger East Anglia Hub macro-complex, which aims to deliver significant offshore wind capacity to the UK grid. Securing seabed clearance is a regulatory and safety prerequisite in the North Sea, a region heavily congested with legacy maritime debris, shipping lanes, and World War II-era unexploded ordnance. As offshore wind turbines grow in size and capacity, the precision required for foundation installation has intensified, making pre-construction site preparation a highly specialized and lucrative sector within the marine engineering industry.

Market Impact

This development underscores the tightening supply chain for specialized offshore support vessels (OSVs) and subsea engineering services in Northwest Europe. For OEG, securing this contract solidifies its position as a tier-one offshore wind service provider, demonstrating the commercial viability of transitioning oil and gas marine expertise into the renewables sector. For the wider market, successful seabed clearance de-risks the construction schedule for ScottishPower Renewables, reducing the likelihood of costly delays during the subsequent piling and turbine installation phases. However, the high demand for such specialized vessels may drive up charter rates for concurrent offshore projects in the region.

What to Watch

Following the completion of OEG's seabed clearance campaign, the project will transition to the installation of offshore substations and turbine foundations. Industry observers should monitor the timeline for the final investment decision (FID) milestones and subsequent turbine supply agreements, with first power targeted for the late 2020s. Additionally, the efficiency of this clearance campaign will serve as a benchmark for upcoming tenders in the East Anglia Three and East Anglia One North sister projects.

Frequently Asked Questions

What is the primary purpose of seabed clearance in offshore wind development?: Seabed clearance is a critical safety and engineering phase designed to remove physical obstacles such as boulders, debris, and unexploded ordnance (UXO) from the seafloor. Clearing these hazards ensures that jack-up vessels can position themselves safely and that turbine foundations and subsea cables can be installed without structural interference or costly equipment damage.
Who is developing the East Anglia Two offshore wind farm and what is its capacity?: The project is being developed by ScottishPower Renewables, which is part of the Spanish utility giant Iberdrola. Once completed, the East Anglia Two wind farm will have an installed capacity of up to 900 MW, contributing significantly to the UK's target of reaching 50 GW of offshore wind capacity by 2030.
How does this project affect the offshore marine services supply chain?: This campaign highlights the intense competition for specialized subsea vessels and offshore expertise, which are shared between the offshore wind and traditional oil and gas sectors. As more mega-projects enter the construction phase simultaneously, developers face potential bottlenecks and rising day rates for high-specification vessels equipped for UXO clearance and heavy boulder relocation.

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