Ørsted Supreme Court tax ruling: implications for offshore survey budgets
Reviewed by Joe Ashwell

First reported on New Civil Engineer
30 Second Briefing
Ørsted has lost a UK Supreme Court case over whether it could claim tax relief on geotechnical and environmental surveys for offshore wind farms that never progressed to construction. The ruling confirms that expenditure on early-stage site investigation and feasibility work for prospective projects does not qualify as “research and development” for UK tax purposes when no tangible asset is created. Developers may now need to reprice front-end survey campaigns and reconsider how they structure pre-consent ground investigation and design studies.
Technical Brief
- Front-end ground investigation campaigns for UK offshore projects now carry higher unrecoverable sunk-cost risk in bid pricing.
Our Take
Ørsted’s adverse Supreme Court outcome in the United Kingdom will sharpen cost and risk modelling for early-stage offshore wind surveys, as developers can no longer assume tax relief on large pre-consent investigation campaigns in that jurisdiction.
With Ørsted also advancing UK assets like the Iceni battery energy storage system near Hornsea 3, as noted in our coverage of Knights Brown’s new Norwich hub, the ruling may push more rigorous separation of survey, development and construction SPVs to manage tax exposure across integrated wind–storage portfolios.
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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