Category: Renewable energy insurance · Reviewed by Tim Roche, Director · PI & Commercial · Last reviewed 2026-06-10
Offshore wind insurance is the specialist marine-energy programme placed for fixed and floating offshore wind farms, hybridising construction all risks, marine cargo, delay in start up and operational covers around the WELCAR 2001 wording family.
Category: Renewable energy insurance Also known as: Offshore wind farm insurance, OWF insurance, WELCAR wind insurance Typical UK market form: WELCAR 2001 CAR + Marine Cargo + DSU + OAR + BI + Liability tower Related concepts: Wind farm insurance, Marine cargo insurance, Construction all risks insurance
Offshore wind insurance covers the development, construction, commissioning and operation of generation assets located in territorial waters or the UK Exclusive Economic Zone. The insured asset typically comprises a number of wind turbine generators (WTGs) — increasingly in the 14 to 18 MW range for new projects — supported by monopile, jacket or floating foundations, an inter-array cable network, one or more offshore substations (sometimes including HVDC converter platforms) and the export cable to the onshore grid connection point.
As an insurance class, offshore wind sits at the intersection of energy, marine and construction underwriting. Most large projects are placed in the London market, drawing capacity from Lloyd’s syndicates and the international company market, with co-insurance arrangements between marine and energy underwriters reflecting the maritime exposure of installation vessels and the technology exposure of the turbines themselves.
The construction-phase placement is normally written on the WELCAR 2001 wording (JR 2001-007), the standard offshore construction project policy form developed by the Joint Rig Committee and last formally revised in 2014. WELCAR covers physical loss or damage to the works (Section I) and third-party liability arising out of the project (Section II), with marine cargo cover for inbound components either embedded or written on a parallel Institute Cargo Clauses (A) basis. Delay in Start Up (DSU) cover, typically following Munich Re’s template wording, indemnifies the project for loss of CfD-indexed revenue caused by a covered physical damage event delaying commercial operation.
On commissioning, the placement converts to an Operational All Risks programme covering property damage and machinery breakdown to all offshore and onshore assets, business interruption on a gross revenue basis tied to the CfD or merchant revenue stack, and a co-ordinated liability tower. Environmental Impairment Liability is increasingly written on a separate basis to address oil release from transformers and cable insulation fluids. Specific cover for cable damage, including burial and re-burial costs, is typically sub-limited and is one of the most negotiated extensions.
Cable damage is the single largest claims driver for operational UK offshore wind, with anchor drag, dropped objects from third-party vessels and seabed mobility causing repeated inter-array and export cable failures. The 2014–2018 industry loss experience, summarised publicly by GCube and the IMIA Working Group reports, drove material rate increases and tightened deductibles. Foundation grouted connection failures, identified across an early generation of monopile installations from around 2009, are a documented industry-wide defect that prompted retrofit programmes and influenced subsequent LEG 3/06 endorsement practice.
Other exposures include installation vessel incidents (jack-up punch-through, cable lay vessel grounding), heavy weather damage to turbines under installation, blade transport and lifting losses, and emerging risks around floating foundation mooring lines for projects coming forward in the Celtic Sea and INTOG (Innovation and Targeted Oil and Gas) Scottish leasing round. Lightning, fire in transformer compartments and gearbox failures continue to drive the operational claims count.
Seabed rights are granted by The Crown Estate (for England, Wales and Northern Ireland) and Crown Estate Scotland (for Scottish waters). Round 1 (2000), Round 2 (2003) and Round 3 (2010) established the UK as the world leader in offshore wind by installed capacity. Round 4 was launched in February 2019 and awards were announced in September 2022, with the Celtic Sea floating wind leasing process completing in 2024 and INTOG awards made by Crown Estate Scotland in March 2023.
Projects above 100 MW require development consent under the Planning Act 2008 Nationally Significant Infrastructure Projects (NSIP) regime, with applications determined by the Secretary of State following Examining Authority recommendation. Revenue support is delivered through the Contracts for Difference scheme administered by the Low Carbon Contracts Company under the Energy Act 2013, with offshore wind clearing AR4 (July 2022) at £37.35/MWh in 2012 prices, securing no offshore awards in AR5 (September 2023) due to administrative strike prices being set below tender economics, and returning at higher strike prices in AR6 (September 2024).
London Lloyd’s remains the global centre for offshore wind capacity, with significant lines written by major syndicates and a renewable energy consortium structure that historically provided lead capacity. GCube Insurance (Tokio Marine HCC), Munich Re, Swiss Re Corporate Solutions and a number of Lloyd’s energy syndicates are recurring leaders. On the broker side, Marsh, Aon, WTW, Lockton and McGill & Partners maintain dedicated offshore wind teams in London.
Capacity has tightened materially since 2019 following sustained loss experience, with leaders requiring more rigorous warranty surveys (MWS), installation methodology review by an independent marine warranty surveyor, and stricter cable risk control. Total programme limits for the largest projects can exceed £2 billion across construction and DSU.
The Dogger Bank wind farm complex (Dogger Bank A, B and C) in the southern North Sea, sited approximately 130 km off the North East coast of England, is being constructed in phases by a joint venture and is expected on full commissioning to deliver around 3.6 GW. A project of this scale is placed on a multi-year WELCAR construction policy with a property damage sum insured running into the billions of pounds, DSU cover sized to the contracted CfD revenue stream, marine cargo cover following the GE Haliade-X nacelles from Saint-Nazaire, and a third-party liability tower commensurate with the heavy-lift vessel exposure.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-10. Next review: 2026-12-10.
Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.
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