Insurance for renewable energy projects splits into coverage for the construction phase and coverage for the operational phase, plus a handful of sector-specific add-ons. During construction, Builder’s Risk (CAR) insurance protects materials and work in progress. Once operating, Operational All-Risk (OAR) insurance covers the physical assets. This usually pairs with business interruption coverage for lost revenue during downtime. On top of that sit sector-specific products: Delay in Start-Up (DSU) coverage, tax credit protection for the ITC and PTC, cyber liability for grid-connected systems, and increasingly parametric insurance. That last type pays out based on a weather trigger, like wind speed or hail intensity, rather than a traditional damage assessment. Real specialty insurers in this space include Zurich, AXIS Capital, The Hartford, Munich Re, Chubb, Travelers, GCube, and Descartes Underwriting, among others.
Renewable Energy Insurance: Key Facts at a Glance
| Question | Short answer |
|---|---|
| What are the two main coverage phases? | Construction (Builder’s Risk / CAR) and operations (Operational All-Risk / OAR) |
| What covers lost revenue during downtime? | Business interruption insurance, often paired with Delay in Start-Up (DSU) coverage before commissioning |
| What protects tax credits like the ITC and PTC? | Dedicated tax credit / performance guarantee insurance, distinct from property coverage |
| What’s parametric insurance? | Coverage that pays out based on a predefined weather trigger (wind speed, hail intensity) rather than a damage assessment, speeding up claims |
| Do offshore wind workers need special coverage? | Yes, typically under the U.S. Longshore and Harbor Workers’ Compensation Act (USL&H) for work over navigable waters |
| How much does a wind turbine’s output actually decline with age? | Roughly 0.7% to 1.6% per year, per peer-reviewed studies, not the much higher figures sometimes quoted online |
| Who are real specialty insurers in this space? | Zurich, AXIS Capital, The Hartford, Munich Re, Chubb, Travelers, GCube, AXA XL, Liberty Specialty Markets, Descartes Underwriting, among others |
| Is “AXIS” the insurer the same as “Axis Investments” or “Axis Bank”? | No. AXIS Capital is a Bermuda-based specialty insurer; other “Axis”-named financial firms are unrelated companies |
The Two Coverage Phases Every Project Needs
Renewable energy insurance isn’t one policy. It splits cleanly into two phases. Confusing them is a common source of coverage gaps.
During construction, a Builder’s Risk policy, sometimes called Construction All-Risk (CAR) in this sector, covers materials, equipment, and work in progress. It protects against fire, theft, weather damage, and similar risks while the project is being built. This is the coverage that responds if a partially installed solar array is damaged by a storm before it’s ever generated a watt of power.
Once the project is operating, an Operational All-Risk (OAR) policy takes over. It covers the completed physical assets, turbines, panels, inverters, transformers, against ongoing operational risks. Business interruption coverage typically runs alongside OAR. It replaces lost revenue if the project has to stop generating power due to a covered loss.
Between these two phases sits Delay in Start-Up (DSU) coverage. This protects against lost revenue and fixed costs if construction delays push back your commissioning date, a real risk given how often supply chain and permitting delays affect large energy projects.
Reviewing how these two phases interact in practice, the gap that trips up developers most often isn’t the coverage itself. It’s the handoff between them. A project can carry excellent Builder’s Risk coverage and excellent OAR coverage, and still have an uninsured window in between, if commissioning testing, the period when the asset is technically complete but not yet formally handed over to operations, isn’t clearly assigned to either policy. Ask your broker directly which policy covers that specific window before you sign either one.
Sector-Specific Coverage Worth Knowing About
Beyond the two core phases, a handful of specialized products come up repeatedly in this sector.
Tax credit protection is its own category, distinct from property coverage. Projects financed against the Investment Tax Credit (ITC) or Production Tax Credit (PTC) can lose part of that value if construction delays or performance shortfalls jeopardize eligibility. Tax equity investors often require dedicated coverage protecting that specific financial exposure.
Cyber liability coverage has become more relevant as solar and wind assets connect to smart grids and rely on SCADA monitoring systems. A cyberattack on grid-connected infrastructure is a real and growing risk category insurers are actively underwriting for. Publicly verified, named incident data specific to this sector is limited, though, so treat any specific frequency or cost claim you see elsewhere with caution unless it’s tied to a named, dated source.
Parametric insurance is one of the more genuinely new developments in this space. Instead of a traditional loss assessment, a parametric policy pays out automatically once a predefined trigger is met. For example, wind speeds or hail intensity above a set threshold, measured by an independent data source like NOAA. This can significantly speed up claims payment, since there’s no dispute over the extent of damage, only whether the trigger was met. Descartes Underwriting is one specialty insurer actively offering this structure for renewable assets.
Workers’ compensation for offshore wind has its own wrinkle. Workers on offshore installations over navigable US waters typically fall under the U.S. Longshore and Harbor Workers’ Compensation Act (USL&H), rather than standard state workers’ comp. This usually requires broader benefits and different underwriting than an onshore project would need.
A Correction Worth Making Directly: Wind Turbine Degradation Rates
If you’ve read that wind turbines lose 15% to 20% of their efficiency every year, that figure is far too high. It matters for anyone modeling insurance value or expected output over a project’s life.
Peer-reviewed research on operating wind farms puts the real annual degradation rate at roughly 0.7% to 1.6% per year, depending on the study and turbine generation. One widely cited analysis found turbines lose about 1.6% of output annually. Load factors declined from around 28.5% when new to about 21% by year 19, a meaningful decline over two decades, but nothing close to a 15-20% annual figure. Getting this number right matters specifically for performance guarantee insurance and any output-based financial modeling tied to a project’s expected lifetime production.
Real Named Insurers in This Space
Several established insurers and specialty underwriters are genuinely active in renewable energy risk. Each has a slightly different focus, based on their own public product pages and market positioning.
Zurich offers renewable energy coverage spanning solar, wind, hydro, geothermal, and biomass projects, positioned around integrated risk management for the sector. AXIS Capital provides tailored coverage for renewable projects worldwide, with particular depth in onshore and offshore wind. The Hartford offers renewable energy coverage structured as inland marine insurance, protecting materials and equipment during transit and installation. Munich Re, through its Novatae platform and other channels, brings reinsurance-level catastrophe modeling and parametric expertise to the sector. Chubb, Travelers, GCube, AXA XL, and Liberty Specialty Markets are additional established names in this space, each with published renewable energy product lines. Descartes Underwriting specializes specifically in parametric coverage for renewable assets.
One disambiguation worth making directly: “AXIS Capital,” the specialty insurer, is a different entity from other financial companies also using the name “Axis,” including Axis Bank and various Axis-branded investment firms. If you’re researching this specific insurer, confirm you’re looking at AXIS Capital Holdings’ actual insurance products, not an unrelated company that happens to share part of the name.
What’s Genuinely Uncertain or Varies by Project
A few specific claims that circulate in this space change frequently and depend heavily on project size, location, and current federal guidance. This includes specific dollar thresholds for FERC hydropower environmental coverage, state-by-state storm surge mandates for offshore wind, and exact domestic content percentage thresholds tied to tax credit eligibility. Rather than quote a specific number that may already be outdated by the time you read this, confirm current thresholds directly with FERC, your state’s energy regulator, and a tax professional familiar with current IRA-related guidance. These figures are exactly the kind of thing that shifts with new rulemaking.
Battery storage (BESS) projects carry a risk profile distinct from generation assets. Zurich and other major renewable insurers explicitly list battery energy storage systems as their own coverage category, separate from solar or wind. Thermal runaway, the chain reaction that can cause a battery fire to spread and reignite even after it appears extinguished, is the risk insurers focus on most, along with fire suppression system performance and the physical separation required between battery modules. If your project pairs generation with storage, confirm your policy treats the battery system as its own insured asset with its own limits, not as an afterthought bundled into a generic property line.
Risks That Differ by Project Type
The two-phase structure applies across the board. But the specific risks driving your premium differ a lot depending on what you’re building.
Solar projects face panel degradation over time. This is real but modest, typically under 1% output loss per year for well-made panels. They also face hail and severe weather damage to panels and mounting structures, and inverter failures that can take a system offline even when the panels themselves are undamaged. Performance guarantee insurance exists specifically to back the manufacturer’s or installer’s output promises over the panel’s warranted life.
Wind projects, onshore and offshore, face different risks: blade erosion from wind and debris over time, and gearbox and drivetrain failures. Offshore sites specifically face marine risks during installation and operation that a standard onshore policy won’t address. Offshore wind also brings the USL&H workers’ compensation requirement described above, plus generally higher premiums tied to the added complexity of marine construction and access.
Hydropower projects carry their own risk profile: aging dam infrastructure in need of upgrades, sediment buildup that reduces output and requires cleanup, and environmental liability tied to water quality or wildlife impact. Many hydropower assets are older infrastructure being modernized, rather than new builds. That adds a layer of structural and regulatory risk that a newer solar or wind project doesn’t carry in the same way.
Building a Coverage Package: What to Actually Ask For
When comparing quotes from different insurers, a consistent set of questions helps you compare apples to apples.
Ask each insurer to quote Builder’s Risk and Operational All-Risk coverage separately. Then ask how DSU coverage interacts with your specific commissioning timeline. Ask directly whether tax credit protection is included, bundled, or requires a separate rider, since this varies significantly between insurers. Ask what triggers a parametric payout if you’re considering that structure, and get the specific data source and threshold in writing. Confirm the insurer’s AM Best financial strength rating directly from AM Best’s own site, rather than relying on a secondhand summary, since this is publicly verifiable and worth checking yourself. Finally, ask each insurer directly how many years of renewable-specific underwriting experience they actually have, not just general commercial property experience, since risk modeling for solar, wind, and hydro differs meaningfully from standard commercial coverage.
The Honest Read: Is This Guide Right for You?
This page earns its keep if you’re trying to understand the actual structure of renewable energy insurance. That means construction versus operational coverage, tax credit protection, parametric options, rather than a list of inflated statistics dressed up as expertise. It’s less useful if you already have a broker and a term sheet in hand and need line-by-line negotiation help, which is better handled directly with a specialist broker who can quote your specific project.
Conclusion
Insurance for renewable energy projects centers on two core phases: Builder’s Risk during construction, and Operational All-Risk once a project is generating power. Layer on sector-specific products like DSU coverage, tax credit protection, cyber liability, and increasingly parametric structures that pay out on a weather trigger rather than a damage assessment. Real, established insurers in this space include Zurich, AXIS Capital, The Hartford, Munich Re, Chubb, Travelers, GCube, and Descartes Underwriting, among others. Be skeptical of specific statistics you see quoted elsewhere in this space, including wind turbine degradation rates, which are commonly overstated by a wide margin. Confirm exact regulatory thresholds directly with FERC, your state energy regulator, or a tax professional, since these change with new rulemaking.
FAQs
What is insurance for renewable energy projects?
It’s a set of coverages built around two phases: Builder’s Risk (or CAR) insurance during construction, and Operational All-Risk (OAR) insurance once the project is generating power, layered with sector-specific products like business interruption, tax credit protection, and cyber liability.
What are renewable energy projects, in insurance terms?
Solar, wind, hydropower, geothermal, and battery storage installations, each carrying different specific risks: weather and equipment failure for solar and wind, environmental and regulatory risk for hydropower, and cyber and grid-connection risk across all types as they become more connected.
What’s the difference between Builder’s Risk and Operational All-Risk coverage?
Builder’s Risk (CAR) covers materials, equipment, and work in progress during construction. Operational All-Risk (OAR) covers the completed physical assets once the project is generating power. They’re sequential, not interchangeable, and most projects need both at different stages.
Do renewable energy EPC companies need their own insurance?
Yes. Engineering, procurement, and construction (EPC) contractors typically carry their own general liability and professional liability coverage. This is separate from the project owner’s Builder’s Risk policy. Contracts should clearly define which party’s coverage responds to which type of loss.
What is a renewable energy insurance policy, specifically?
It’s rarely a single policy. Most projects carry a package instead. That’s Builder’s Risk or OAR property coverage, business interruption, and general liability. Often DSU, tax credit protection, and cyber liability come as separate components or riders within a broader program.
How much does renewable project insurance typically cost?
Cost varies enormously by project type, size, location, and coverage scope, and any specific premium figure quoted online for a generic project should be treated skeptically. Get quotes from at least three specialty insurers for your specific project rather than relying on a general estimate.
Do wind turbines really lose 15-20% of their efficiency every year?
No. Peer-reviewed studies put real annual output degradation at roughly 0.7% to 1.6% per year, a meaningful decline over a project’s lifetime, but far lower than the inflated figures sometimes quoted online.
What is parametric insurance for renewable energy?
A policy structure that pays out automatically once a predefined trigger is met, like wind speed or hail intensity crossing a threshold measured by an independent data source, rather than requiring a traditional damage assessment. This can speed up claims significantly.
Do offshore wind workers need special workers’ compensation coverage?
Typically, yes. Workers on offshore installations over navigable US waters generally fall under the U.S. Longshore and Harbor Workers’ Compensation Act (USL&H), which usually requires broader benefits than standard state workers’ compensation.
Does insurance protect the Investment Tax Credit (ITC) or Production Tax Credit (PTC)?
Dedicated tax credit protection products exist specifically for this purpose, separate from standard property coverage, since construction delays or performance shortfalls can jeopardize tax credit eligibility independent of physical damage to the project.
Is AXIS Capital the same company as Axis Bank or Axis Investments?
No. AXIS Capital sells renewable energy insurance. Axis Bank and various Axis-branded investment firms are unrelated companies that just happen to share part of the name. Confirm which one you’re researching before trusting information about either.
Which insurers actually specialize in renewable energy coverage?
Zurich, AXIS Capital, The Hartford, Munich Re, Chubb, Travelers, GCube, AXA XL, Liberty Specialty Markets, and Descartes Underwriting all have named, public renewable energy or parametric insurance product lines, based on their own published materials.
Does battery storage need different insurance than solar or wind?
Yes. Battery energy storage systems (BESS) are typically underwritten as their own coverage category, distinct from generation assets. Insurers focus specifically on thermal runaway risk and fire suppression performance, so confirm your policy treats storage as its own insured asset with its own limits.
How does cyber liability apply to renewable energy projects?
As solar and wind assets connect to smart grids and rely on SCADA monitoring, they become a real cyberattack target. This is a genuine and growing underwriting category. Be cautious of unverified frequency or cost statistics circulating about specific incidents, though.
What should I ask an insurer before buying renewable energy coverage?
Ask for Builder’s Risk and Operational All-Risk quoted separately, how DSU coverage aligns with your commissioning timeline, whether tax credit protection is included or a separate rider, the exact trigger and data source for any parametric component, and the insurer’s current AM Best rating, verified directly on AM Best’s own site.
About This Guide
This guide was researched and written by the InsuranceGuidances Editorial Team using named insurer product pages and peer-reviewed technical data. See the methodology note at the top of this article for source details.
Reviewed October 2026.
Methodology: This guide is built from named insurer product pages (Zurich, AXIS Capital, The Hartford, Munich Re/Novatae, Descartes Underwriting). It also draws on the AI Overview’s own construction-phase and operational-phase framing for this search term, and peer-reviewed data on wind turbine performance degradation, where a competing draft’s figures didn’t hold up. Where a specific regulatory requirement couldn’t be verified against a primary source, we say so directly, rather than stating it as settled fact.
Sources
AM Best, insurer financial strength rating lookup (ambest.com)
Zurich, “Zurich Solutions for Renewable Energy Insurance Needs,” including battery storage (BESS) and carbon capture coverage categories (zurichna.com)
AXIS Capital, “Renewable Energy” product page (axiscapital.com)
The Hartford, “Renewable Energy Insurance: Inland Marine Coverage” (thehartford.com)
Descartes Underwriting, “Renewable Energy Insurance: Parametric Cover” (descartesunderwriting.com)
Staffell, I. and Green, R., “How does wind farm performance decline with age?” Renewable Energy journal (sciencedirect.com)
Windpower Monthly, “Turbine output drops steeply after ten years: US research” (windpowermonthly.com)
NREL, wind plant performance and loss estimation technical report (docs.nrel.gov)
Federal Energy Regulatory Commission, hydropower licensing and compliance guidance (ferc.gov)
U.S. Department of Labor, Longshore and Harbor Workers’ Compensation Act overview (dol.gov)
