Climate Tech Insurance

BESS and the thermal runaway problem

Battery fires at utility-scale storage projects have hardened the property insurance market for energy storage over the past five years. Carriers that had written BESS property coverage on standard terms moved to restrict or exit the line after high-profile thermal runaway events. The January 16, 2025 fire at Vistra's Moss Landing Phase 1 facility in Monterey County, California destroyed a 300 MW / 1,200 MWh LG NMC system and prompted evacuation of 1,200 to 1,700 residents; WECC's final report on the incident was published December 22, 2025. Earlier events at the Victorian Big Battery in Australia (July 2021, Tesla Megapack NMC) and the McMicken substation in Surprise, Arizona (April 2019) shaped underwriting practice well before Moss Landing. Both NMC (nickel manganese cobalt) and LFP (lithium iron phosphate) chemistries have produced large loss events, though their fire propagation behaviors differ.

The underwriting response focused on three factors: cell chemistry and vendor selection, physical separation distances between battery enclosures, and active suppression system requirements. Several carriers now require UL 9540A fire test data for battery systems and restrict coverage to vendors whose products have passed third-party thermal propagation testing. Separation distance requirements of at least 10 feet between enclosures have become standard in many policies, and premiums for projects without fixed suppression systems carry significant coverage restrictions or exclusions.

kWh Analytics' 2026 Solar Risk Assessment identifies fire as the next major emerging risk for solar and BESS assets, finding that 84% of PV fire loss events are equipment-driven brushfires rather than large-area wildfires. Only 4% occur in high wildfire risk areas. The report notes that fire losses are increasingly measurable, and that fire-code compliance now shows up directly in insurance pricing and deductibles for developers. (kWh Analytics, Solar Risk Assessment 2026.)

Hail and the solar property market

Hail accounts for about 6% of solar insurance claims by count but about 73% of total dollar losses, per kWh Analytics' 2025 Solar Risk Assessment. Individual hail events damage large numbers of modules at once, which produces high-severity claims relative to claim frequency. GCube, the renewables-focused MGA owned by Tokio Marine HCC, reported an average solar hail claim expense of $58M+ in its Q4 2023 report "Hail No! Defending solar from nature's cold assault." That figure is MGA-disclosed and not independently verified.

The September 2023 hailstorm in Austin, Texas documented the concentration risk. NREL satellite analysis of more than 11,000 PV systems exposed to the storm found that 5.5% sustained damage, concentrated in radar-predicted high-hail zones. Regional damages exceeded $600M, per the National Weather Service, as cited in kWh Analytics' Resilient Power Report 2025.

Tracker-mounted projects with automated hail stow have shown measurable insurance impact. kWh Analytics documented one case in 2025 (a 13 MW municipal project in Arkansas) where deploying automated hail stow at a 60-degree stow angle cut the project's insurance deductible by 50%. The system protected itself automatically during multiple severe storm events. 13% of US locations require both hail-hardened modules and automated stow to keep a 100 MW plant's 1-in-100 hail loss below 10% of asset value. (kWh Analytics, Solar Risk Assessment 2026.)

Performance warranties and the manufacturer credit problem

Solar panel performance warranties failed repeatedly in the 2010s because warranty obligations sat with manufacturers whose credit life was shorter than the warranty term. When manufacturers went bankrupt (Solyndra in 2011, Abound Solar in 2012, Suntech in 2013, SunEdison in 2016, among others), warranties became unenforceable claims against insolvent estates. Project finance lenders and developers had assumed manufacturer credit risk without pricing it separately.

Insurance responded with structured products that separate technology performance risk from manufacturer credit risk. kWh Analytics built a database of 300,000+ renewable energy assets and $150B+ in loss data to underwrite solar performance risk on actuarial grounds. New Energy Risk, an MGA acquired by Paragon Insurance Holdings in March 2022 (previously a majority-owned subsidiary of AXA XL), applies similar actuarial methodology to novel energy technologies, writing performance warranties for projects where the technology is validated but the operating history is limited. Energetic Capital focuses on commercial and industrial solar and storage, writing credit-wrapped performance insurance that gives lenders a rated counterparty rather than a manufacturer warranty.

The Geneva Association's Insurability Readiness Framework, published in its 2024 Climate Tech and Insurance report, classifies this exposure under "legal, finance and compliance risk," one of seven risk categories where specialty insurance products are still being developed for emerging climate technologies. The IRF identified green hydrogen and carbon management as the test cases for mapping where products exist and where gaps remain.

Parametric products and the Insurability Readiness gap

Parametric insurance products pay on observable trigger events rather than assessed losses. For solar and wind projects, common triggers include hail intensity measured by weather radar, sustained wind speeds at the project location, and grid outage duration. Because parametric policies settle faster than traditional loss-adjustment processes and don't require physical inspections, they fit projects where revenue downtime is the primary economic risk rather than physical replacement cost.

Carriers use combinations of satellite-derived hail data, National Weather Service radar, and ISO perils indices to structure parametric triggers for renewable energy exposures. Basis risk (the gap between the trigger event and actual project losses) remains the primary limitation. A hail event that triggers the policy but causes less damage than the threshold payment, or a damaging event that falls just below the trigger threshold, produces misalignment between payout and loss.

The Geneva Association's 2024 Insurability Readiness Framework identifies seven risk categories where insurance products for climate technologies are still being built: technology risk; project information and organisation risk; legal, finance and compliance risk; physical risk at project location; business interruption and supply chain risk; long-term risk; and environmental, social and governance risk. The IRF applied these categories to green hydrogen and carbon management, mapping where existing products apply and where no market capacity currently exists. The report found that engaging reinsurers from the demonstration and early deployment stage (TRL 6) is critical to eventual commercialization. (Geneva Association, Climate Tech and Insurance, 2024.)

United States

The 2025 One Big Beautiful Bill Act narrowed federal incentives for wind, solar, and electric vehicles, and extended targeted support for carbon capture, utilization and storage, nuclear, geothermal, energy infrastructure, and critical materials. Projects in categories that lost support saw their expected economic life shortened, which affected underwriting assumptions for property and performance policies on those assets. Projects structured around the previous ITC or PTC treatment now face revised financial projections, which in some cases reduce the creditworthiness underlying insurance-backed warranties.

The Department of Energy's former Loan Programs Office, now operating as the Office of Energy Dominance Financing following 2025 reorganization under the OBBBA, continues to require specialty insurance coverage as a condition of project financing. Funded projects must carry property, casualty, and in many cases performance coverage on terms approved by the office. The legacy LPO portfolio includes solar, wind, storage, geothermal, nuclear, and hydrogen projects; insurance requirements have driven demand for specialty coverage across those technology categories. Several MGA entrants to the climate tech insurance market cite the LPO requirements as an early demand source. Under the renamed office, funding priorities have shifted toward nuclear, coal, oil and gas, critical minerals, geothermal, grid and transmission, and manufacturing.

State-level oversight of battery storage safety has advanced in California and New York. Following the January 2025 Moss Landing fire, the CPUC tightened BESS safety standards and emergency response oversight, with new requirements covering incident reporting and emergency plans for grid-connected storage. New York's NYSERDA Battery Energy Storage System Guidebook (most recently revised in 2025) addresses siting, fire codes, and peer review for proposed installations, with the Department of Public Service overseeing utility interconnection requirements. State frameworks of this kind influence BESS underwriting indirectly by setting siting, fire-protection, and incident-reporting baselines that carriers reference when pricing property and third-party liability coverage.

FERC Order 2222 (September 2020), which requires distribution system operators to allow aggregated distributed energy resources to participate in wholesale markets, affects how distributed storage and generation assets are insured. Aggregated assets may span multiple ownership structures and physical locations, which raises the question of which policy responds to a loss at a specific unit within an aggregation. Insurance markets have not fully standardized their treatment of Order 2222 aggregations.

On fusion, the NRC voted in April 2023 to regulate commercial fusion machines under 10 CFR Part 30 (byproduct material) rather than 10 CFR Part 50 (utilization facility). The proposed rule, "Regulatory Framework for Fusion Machines," was published in the Federal Register on February 26, 2026, with a comment period through May 27, 2026; no final rule has been issued. A lighter licensing pathway, if finalized, would change the regulatory risk profile insurers and lenders price for early fusion projects.

European Union

The EU Carbon Border Adjustment Mechanism entered its definitive (compliance) phase on January 1, 2026, ending the 2023 to 2025 transitional reporting-only period. Importers of cement, iron and steel, aluminium, fertilizers, electricity, and hydrogen must now purchase and surrender CBAM certificates for embedded emissions. The covered sectors face tighter decarbonization timelines, which raises demand for technology performance coverage; cross-border supply chains face new compliance exposures on the same goods.

The Geneva Association's April 2026 Expediting Sectoral Decarbonisation report covers six emissions-intensive sectors (oil and gas, steel, cement and concrete, aviation, data centres, buildings) and identifies four insurance challenges common across them: technology risk, supply-chain risk, stranded-asset risk, and long-tail liability. The report notes that industrial production (steel, cement and concrete, aluminium, primary chemicals), oil and gas, and transport (aviation, shipping, trucking) together account for approximately 40% of global Scope 1 and 2 GHG emissions, with the energy use of buildings adding a further 26%.

Solvency II governs the capital requirements and risk management standards for EU-domiciled insurers and reinsurers writing climate tech coverage. The European Insurance and Occupational Pensions Authority has initiated climate risk underwriting workstreams that address how insurers should model physical climate risks and transition risks on their books. EIOPA's August 2022 application guidance on running climate change materiality assessments and using climate change scenarios in the ORSA has influenced how EU carriers model aggregate renewable energy property exposures, particularly for combined hail and wind catastrophe scenarios.

The EU Taxonomy for Sustainable Activities defines which economic activities qualify as environmentally sustainable, which affects how insurance products supporting taxonomy-aligned projects are classified by regulated investors. Insurers classifying products under Article 9 or Article 8 SFDR face ongoing documentation requirements for taxonomy alignment.

Three major CCUS clusters are at different stages of development in Europe. Northern Lights (Equinor, TotalEnergies, Shell) received its first CO2 in August 2025 from Heidelberg Materials' Brevik cement plant, with Phase 1 capacity of 1.5 Mt CO2 per year; the partners took FID on Phase 2 in March 2025 to expand capacity to 5 Mt CO2 per year by 2028. HyNet in the UK (operated by Eni) targets first CO2 injection in 2028, subject to consents. Aramis in the Netherlands (TotalEnergies, Shell Netherlands, EBN, Gasunie) targets operation by the end of the decade, with FID expected in 2026. The Geneva Association's 2026 Sectoral Decarbonisation report flags that cross-border CCUS raises insurance coordination challenges: which legal framework governs long-term liability for stored CO2, how insurers treat the long-tail liability of permanent sequestration, and how reinsurance treaties price across jurisdictions. No standard cross-border CCUS insurance framework currently exists.

United Kingdom

The Prudential Regulation Authority published Supervisory Statement SS5/25, "Enhancing banks' and insurers' approaches to managing climate-related risks," on December 3, 2025, following Policy Statement PS25/25. SS5/25 fully replaces the prior SS3/19 framework and requires PRA-regulated insurers and reinsurers to embed climate risk into governance, risk management, and capital frameworks, with firms expected to complete an internal compliance review by June 3, 2026. For specialty insurers writing renewable energy and climate tech coverage, this means maintaining explicit scenario analysis for aggregate property exposures to physical perils (hail, flood, wind) and for transition risk exposures in energy-related liability lines.

The Climate Change Act 2008 and subsequent UK adaptation reporting requirements place obligations on insurers to report how they are managing climate-related risks. The Financial Conduct Authority has issued parallel guidance aligned with TCFD recommendations, requiring UK-regulated insurance intermediaries to make climate-related financial disclosures. The combination of PRA and FCA requirements has established the UK as one of the more disclosure-intensive jurisdictions for climate risk in insurance.

UK offshore wind is among the most active insurance markets in European renewables. Floating offshore wind projects in the Celtic Sea and northern North Sea introduce hull and machinery coverage, construction all-risk coverage, and marine warranty surveyor requirements that differ from fixed-foundation offshore wind. The Geneva Association's 2026 Sectoral Decarbonisation report notes that the German insurance association GDV (Gesamtverband der Deutschen Versicherungswirtschaft) and the Offshore Wind Energy Foundation have been developing insurance standards for offshore wind, in which UK underwriters have engaged given the cross-border nature of North Sea installations. Lloyd's specialist renewable energy syndicates and MGAs (including GCube, Beazley, and Munich Re's Lloyd's platform) write coverage for offshore wind, with reinsurance commonly placed into Continental European carriers.