N-Sea Completes Vattenfall Offshore Wind Seabed Survey
N-Sea surveyed wind turbine foundations and subsea cables across three Vattenfall offshore wind farms in the North and Baltic seas.
Updated on Nov. 2, 2026 in Environmental
N-Sea Group completed a seabed monitoring campaign for Vattenfall covering 253 wind turbine locations and an extensive network of subsea cables. The campaign spanned the Hollandse Kust Zuid, Vesterhav North and South, and Kriegers Flak offshore wind farms and was completed without incident.
Why it matters
The survey gathers high-resolution data on seabed conditions, scour development, and subsea cable integrity that underpins long-term asset management at offshore wind sites. Such monitoring helps operators detect erosion around turbine foundations and cable damage before they become operational problems.
The campaign surveyed 253 wind turbine locations, including 113 turbines and about 211 kilometres of inter-array cables at Vesterhav and Kriegers Flak. No condition findings from the survey have been reported.
The players
N-Sea Group
N-Sea Group is an offshore survey and marine services company that conducts seabed and subsea infrastructure surveys for energy developers.
Vattenfall
Vattenfall is a Swedish state-owned energy company that develops and operates offshore wind farms in the North and Baltic seas.
The details
N-Sea deployed its offshore survey fleet and nearshore assets across inter-array cable corridors, export cable routes, and offshore substations. The work required coordination between offshore and nearshore survey teams, vessel crews, and onshore personnel.
Timeline
• 2026: Seabed monitoring campaign conducted across the offshore wind farms.
Health Landscape
Campaigns of this kind form part of the routine integrity monitoring that North Sea and Baltic wind operators run across their inter-array and export cables. The survey extends that monitoring to three Vattenfall farms spanning two seas.
Monitoring of seabed scour and cable integrity helps operators schedule maintenance before faults disrupt power delivery. Such work supports the reliability of offshore electricity supply for future consumers.
The takeaway
Routine seabed and cable surveys are a key tool for keeping offshore wind assets reliable over their operating lives. Monitoring data gathered today helps operators plan maintenance before problems develop.
Further reading
Explore more Environmental coverage on how offshore infrastructure affects marine ecosystems.
