Outer Dowsing 1.5GW DCO: geotechnical and marine design notes for engineers
Reviewed by Joe Ashwell

First reported on New Civil Engineer
30 Second Briefing
Development consent has been granted for the 1.5GW Outer Dowsing offshore wind farm, to be constructed 54km off the Lincolnshire coast in the North Sea. The nationally significant infrastructure project will require extensive marine foundations, subsea cabling and grid connection works sized for utility-scale export of 1.5GW to the onshore network. Geotechnical and marine contractors can now progress detailed design for turbine foundations, seabed surveys and installation methodologies under the Development Consent Order framework.
Technical Brief
- Development Consent Order (DCO) status fixes the statutory framework for detailed marine works and onshore interfaces.
- Consent enables procurement of geophysical, geotechnical and UXO surveys along the 54km offshore corridor.
- Grid connection design can now be advanced to match 1.5GW export capacity and fault levels.
- Foundation typology selection (monopile, jacket or hybrid) can proceed using site-specific metocean and soil data.
- Installation methodologies for piling, cable lay and burial must now be aligned with DCO environmental conditions.
- Contractors gain certainty to schedule jack-up or floating installation vessel campaigns several seasons in advance.
- Onshore landfall and cable route geotechnics move from corridor optioneering to plot-level ground investigation planning.
Our Take
At 1.5GW, Outer Dowsing sits at the upper end of UK offshore wind project scales in our infrastructure database, which typically sees individual arrays clustered around the 1GW mark, signalling grid-connection and onshore interface works of national rather than purely regional significance for Lincolnshire.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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