Category: Renewable energy insurance · Reviewed by Taylor Watts, Broker · New Business · Last reviewed 2026-06-10
Geothermal energy insurance is the composite drilling, construction and operational programme placed for deep geothermal heat and power projects, addressing subsurface resource risk, well control and induced seismicity exposures alongside conventional plant risks.
Category: Renewable energy insurance Also known as: Deep geothermal insurance, Geothermal heat insurance, Geothermal drilling insurance Typical UK market form: Drilling/Well Control + CAR + OAR + BI + Public Liability + EIL Related concepts: Renewable energy operational risks, Hydroelectric insurance, Environmental impairment liability insurance
Geothermal energy insurance covers projects that extract heat from the subsurface for direct heating use, district heating networks, combined heat and power, or electrical generation. The UK has only a small number of deep geothermal projects, principally in Cornwall (United Downs and Eden Project), and a developing portfolio of mine water geothermal schemes in the north-east of England exploiting abandoned coal mine workings.
The asset envelope comprises one or more production and injection wells (typically 2–5 km deep for hot dry rock projects), wellhead equipment, surface heat exchangers and either organic Rankine cycle generation equipment or heat exchange equipment for district heat connection. As an insurance class, geothermal sits at the intersection of upstream oil & gas drilling underwriting, conventional power generation underwriting and a distinctive subsurface resource risk that has no direct analogue in other renewable energy classes.
Drilling is placed on a Drilling and Well Control policy (often based on Energy Exploration & Development wording or bespoke wording derived from upstream oil & gas templates), covering blow-out, control of well, redrill and seepage and pollution. Surface construction is placed on a Construction All Risks (CAR) policy. Marine Cargo cover is typically not required as components are sourced overland. Delay in Start Up cover is sized to the project’s contracted heat or power offtake date and the relevant revenue stream.
Operational placements combine an OAR section covering property damage and machinery breakdown to surface equipment with business interruption tied to heat offtake contracts and (where applicable) CfD or merchant electricity revenue. Public Liability is placed as a stand-alone tower with explicit reference to induced seismicity, ground movement and subsidence exposures. Environmental Impairment Liability cover addresses brine release, hydrogen sulphide emission and groundwater contamination exposures. Resource risk insurance — covering the risk that the well or reservoir delivers below the required temperature or flow rate — is available from a small number of specialist underwriters and from public-sector schemes in some jurisdictions but is rarely placed in the UK.
Drilling phase exposures dominate the project risk profile. Blow-out, lost circulation, stuck pipe, casing failure and unexpected high-pressure or high-temperature zones are the classic well control perils, addressed through Blowout Preventer (BOP) testing regimes and well design review. Induced seismicity is a particularly distinctive geothermal exposure: enhanced geothermal system (EGS) projects worldwide have triggered felt seismic events through fluid injection into rock formations, with the most prominent public-record case being the 2017 Pohang event in South Korea that caused widespread building damage and was attributed by the South Korean government investigation to an EGS project.
Operational exposures include scaling of heat exchangers (particularly silica scaling in high-temperature applications), corrosion from hydrogen sulphide and brine, pump failure and casing degradation. Resource depletion — where flow rate or temperature declines faster than the resource model predicted — is a long-term financial exposure rarely transferred to insurance markets. Mine water geothermal schemes have a distinct exposure profile around mine workings stability and water quality.
Geothermal projects above NSIP thresholds are consented under the Planning Act 2008; smaller projects are consented through the local planning authority under the Town and Country Planning Act 1990. Drilling activities require permits from the relevant environment regulator (Environment Agency in England, Natural Resources Wales, SEPA in Scotland) covering abstraction, discharge, and management of mining waste under the Mining Waste Directive transposition.
Revenue support for geothermal electricity generation is available through the Contracts for Difference scheme administered by the Low Carbon Contracts Company, with deep geothermal placed in Pot 2 from AR4 (2022) onwards. Deep geothermal heat for district heating networks may be supported through the Green Heat Network Fund and successor schemes administered by Department for Energy Security and Net Zero. There is no equivalent in the UK to the resource risk insurance schemes operated in the Netherlands and parts of Germany.
UK geothermal capacity is limited and is principally drawn from upstream energy underwriters with experience of drilling and well control. Munich Re, Swiss Re Corporate Solutions, AIG, Allianz Global Corporate & Specialty, Liberty Specialty Markets and several Lloyd’s energy syndicates have written deep geothermal in Europe. Drilling and well control capacity is co-ordinated through the existing Energy Insurance Account market with the Joint Rig Committee.
Broker placement is concentrated among Marsh, Aon, WTW and McGill & Partners. The class is expected to grow modestly during the late 2020s as more UK projects come forward, although it remains structurally small compared with wind, solar and battery storage.
A deep geothermal project in Cornwall comprising one production well and one injection well drilled to approximately 4.5 km depth into the underlying granite, with a 10 MW thermal output supplying a district heating scheme and a small organic Rankine cycle generator, would typically be insured during drilling under a Drilling and Well Control programme with sums insured of £25–£40 million per well and explicit cover for induced seismicity third-party liability. On commissioning the operator would place an OAR/BI policy covering surface plant with a public liability tower of £25–£50 million.
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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