The Insurance Industry and Nuclear Power: Why This Relationship Is Changing
For nearly 70 years, a peculiar public-private bargain has kept nuclear power insurable — but SMRs are rewriting the terms.
Walk into any standard commercial insurance broker’s office and ask for coverage against a nuclear accident. You will be shown the door almost immediately. Every property and liability insurance policy in the United States explicitly excludes nuclear incidents. Not reluctantly, not with caveats. Just: no. This isn’t some informal convention — it’s baked directly into the legal architecture created when the nuclear industry was born. To get a reactor licensed in America, you don’t go to Lloyd’s of London or Travelers or Chubb. You go to two specialized organizations that exist for exactly this purpose, backed by a federal framework that has been quietly renewed every few years since 1957, and which most Americans have never heard of.
That framework is now under more scrutiny than at any point in a generation. The Price-Anderson Act is getting updated for SMR-era economics. New private insurers are entering the nuclear space for the first time in decades. Swiss Re is publicly acknowledging that essential insurance products for SMR transportation and operation simply don’t exist yet. And a debate that has simmered for decades — about whether government-backed liability limits constitute an invisible subsidy that skews energy markets — is getting louder as nuclear asks for more investment and more public trust. If you want to understand whether the SMR buildout can actually happen at scale, understanding the insurance question is not optional.
The Price-Anderson Act: the deal that made commercial nuclear possible
The year is 1957. The Atomic Energy Commission is trying to commercialize nuclear power, and it runs into a wall: no private utility will build a reactor, because no private insurer will cover the liability risk at a reasonable cost. The technology is new, the worst-case scenarios are genuinely terrifying, and the insurance industry simply doesn’t know how to price something it has no actuarial history for. ⚖️
Congress’s solution was the Price-Anderson Act, signed into law that same year. The deal it struck was blunt but functional: limit the nuclear industry’s liability exposure so that private capital could flow in, in exchange for a government backstop if things went really wrong. The structure it created has two layers:
Primary insurance: Each reactor site must carry the maximum liability insurance available in the private market, currently set at $500 million per site as of January 2024, up from $450 million
Secondary layer (industry self-insurance): If primary coverage is exhausted, every licensed reactor operator contributes to a shared pool — up to approximately $158 million per reactor in retrospective assessments — creating a total pool currently exceeding $16 billion
Federal backstop: Any damages above the pool get paid by Congressional action, with no defined upper limit
The act has been extended five times. Most recently, as part of the Further Consolidated Appropriations Act of 2024, Price-Anderson’s authority to indemnify new reactors was extended to December 31, 2065, giving a 40-year runway. In practice, this means that for any SMR developer seeking a license in the United States, the liability framework is now secure through the middle of this century. That certainty matters enormously when you’re trying to attract private capital to a $3 billion construction project. 🏛️
What Price-Anderson does not do — and this is the part that critics won’t let go — is cover what a truly catastrophic accident might actually cost. The Fukushima disaster caused damage estimates exceeding $90 billion. The Price-Anderson pool covers only the first $16.1 billion. The gap between those two numbers is, depending on your perspective, either a responsible limitation on tail-risk or a massive hidden subsidy that makes nuclear look artificially cheap compared to energy sources whose full liability costs are uninsured by the government. Supporters of the system point out that in 70 years, not a single nuclear incident has produced claims above the primary layer. Critics point out that Fukushima happened and Japan is still paying for it.
NEIL and ANI: the two organizations insuring all of America’s nuclear plants
Forget the competitive marketplace you might imagine. When it comes to nuclear property insurance in the United States, there is effectively one provider. Nuclear Electric Insurance Limited (NEIL), a mutual insurer founded in 1980 in direct response to the Three Mile Island accident, underwrites essentially the entire nuclear utility property insurance coverage in the country. It holds assets exceeding $5 billion and a surplus of over $4 billion as of 2024. AM Best affirmed its A (Excellent) rating in June 2025, describing its balance sheet strength as “strongest.” Its stated mission includes the goal of maintaining resources sufficient to cover two full-limit policy losses simultaneously. 🔬
NEIL’s coverage structure includes:
Up to $1.5 billion per occurrence for property damage at operating plants
Up to $2.75 billion per occurrence for construction-phase builders’ risk coverage
An additional $1.25 billion available exclusively for nuclear perils above the base limit
A retrospective premium mechanism allowing NEIL to assess members up to 10 times their annualized premium in an extreme loss event (a mechanism that has never been triggered)
Notably, NEIL took an underwriting loss in 2024 — not from a nuclear incident, but from wildfire events affecting member plant sites, illustrating that nuclear property risk doesn’t arrive only in the forms you expect.
For public liability insurance, a separate organization handles things. American Nuclear Insurers (ANI) writes the primary liability policy, the Facility Form Policy that satisfies the Price-Anderson Act requirement. All U.S. commercial reactor operators get their primary liability coverage from ANI. The annual premium runs roughly $1 million per single-reactor site, with discounts for multiple reactors sharing the same $500 million site limit. ANI also administers the retrospective insurance program — the second tier — and manages reinsurance relationships with international nuclear pools. 💡
This highly concentrated structure exists because nuclear risk is genuinely unlike any other property or liability risk class. The combination of potential severity, political sensitivity, and the legal exclusion of nuclear events from all standard policies created a market that private insurers largely exited in the 1970s, leaving NEIL and ANI to fill the gap. The question now is whether that structure is adequate — or even appropriate — for an era of factory-built reactors deployed at dozens of sites simultaneously.
The SMR wrinkle: liability rules that help, and gaps that don’t yet have answers
Here is where the insurance picture for SMRs gets genuinely interesting, and a little complicated. The good news is that Price-Anderson’s treatment of SMR liability is actually favorable compared to large reactors, in ways that weren’t obvious when the act was written. ⚡
Under current rules, a multi-SMR plant is treated as a single reactor for the purpose of retrospective premium assessments, as long as the total plant capacity doesn’t exceed 1,300 megawatts and each individual SMR is rated between 100 and 300 megawatts. This means that in the event of a severe release from a six-unit SMR plant — say, a facility using six 120-megawatt units — the liability for the secondary pool is $165.9 million, not six times that. Compare that to what six large reactors would owe, and the savings are substantial.
For micro-SMRs rated below 100 megawatts, the framework is even simpler: only the primary insurance layer applies, with coverage ranging from $4.5 million to $74 million depending on capacity and local population density. Total public liability for sub-100-megawatt reactors is capped at $560 million. The Clyde & Co legal analysis from April 2026 calls these “proportional liability and insurance requirements more suitable for smaller-scale installations.” That’s an understatement — for developers of small-footprint reactors targeting remote or industrial sites, these numbers represent a very different risk profile from traditional nuclear.
The harder problem is what Swiss Re’s Francois Keime described bluntly in October 2025: “There is no product existing yet for the transportation of the small modular reactors. There is no product yet that looks at the different liabilities topics between the constructor, the transporter, the land owner, and then the operator.” This gap matters because factory-built SMRs change the physical risk timeline in ways traditional insurance doesn’t account for. A large light-water reactor stays at its site. A fueled, transportable SMR module — of the type some battery-style designs envision shipping to sites and returning for refueling — has liability exposure at the factory, in transit, during installation, in operation, and on its way back. Who is responsible at each stage, and how much, is genuinely unsettled. 📋
New entrants: why commercial insurers are starting to pay attention
The nuclear insurance market has been quietly closed to most private commercial insurers for decades. That’s starting to shift, and the shift is worth watching carefully. 🚀
The clearest signal came in October 2025, when Tokio Marine GX and Northcourt, an MGA within the Optio Group, launched NC Fusion — the Lloyd’s market’s first dedicated insurance facility for nuclear fusion technology. With initial capacity of $100 million, NC Fusion was explicitly designed to get ahead of commercial deployment rather than react to it. Ben Kinder, Chief Underwriting Officer at Tokio Marine GX, described the logic directly: “The insurance market has historically responded to innovation after it arrives. With nuclear fusion, we’re taking a different approach, positioning ourselves ahead of commercial deployment to ensure insurance coverage doesn’t become an obstacle when this technology is ready to scale.”
That framing is worth sitting with. The traditional nuclear insurance structure reacted to Three Mile Island by creating NEIL. It reacted to growing capacity needs by incrementally expanding coverage limits. NC Fusion represents something different: a proactive bet that nuclear technology is going to need insurance products that the current specialized pool system isn’t designed to provide, and that commercial insurers who move early will capture the market.
Several factors are drawing commercial insurers in now that weren’t present before:
SMR passive safety features — designs like NuScale’s that physically cannot sustain a chain reaction without active cooling — reduce the tail-risk scenario that drove conventional insurers out in the first place
Factory manufacture creates quality control standards and actuarial data that custom-built one-off reactors never generated
Scale of deployment is now projected to be large enough that insurers can build real portfolios rather than concentrating catastrophic exposure on a handful of sites
Mainstream energy investment — from tech giants like Microsoft and Google — signals that the risk is being assessed favorably by sophisticated capital, which other capital tends to follow
Marsh’s March 2026 podcast on SMR insurance risks notes that “the insurance market is adapting to new construction and operational models through increased stakeholder collaboration, early risk advisory involvement, and innovative coverage solutions.” WTW’s global head of nuclear, Kate Fowler, has made the point that a nuclear construction project is essentially identical to any other large construction project right up until the moment fuel goes in the reactor — and conventional construction insurers are perfectly capable of covering the first phase. The nuclear-specific coverage questions only become acute for the last six to twelve months of construction.
The subsidy question that keeps coming back
If you spend enough time in energy policy circles, you will eventually hit the argument that Price-Anderson is a massive hidden subsidy for nuclear power, and that if operators had to carry the full actuarial cost of a catastrophic accident at commercial rates, reactors would be uneconomic to build. This isn’t a fringe position — it appears regularly in rigorous policy analysis and is shared by organizations like Environment America and the Natural Resources Defense Council. 🌍
The counter-argument from nuclear supporters is equally direct: the $16 billion pool has never been tapped above the primary layer in 70 years of U.S. commercial nuclear operation, the TMI accident cost only $71 million, and the social cost of the alternative — burning coal and gas for decades longer while the grid decarbonizes — is also enormous and also isn’t fully priced. Whether you call Price-Anderson a subsidy or a reasonable liability framework for a low-accident-frequency, high-consequence technology probably depends more on your prior views on nuclear power than on the actuarial math.
What’s harder to dismiss is the international comparison. France’s 57-reactor fleet has operated under its own liability structure. South Korea has built and operated reactors at scale. The United Kingdom joined the Convention on Supplementary Compensation for Nuclear Damage effective January 2026, which creates a multilateral liability system that supports SMR vendors operating across borders — explicitly including U.S. firms deploying in the UK. These international frameworks suggest the liability question is manageable at scale, not a fundamental barrier. The real question for SMRs specifically is whether the gap Francois Keime identified — the absence of transportation, multi-party, and operational liability products for modular designs — gets filled by private commercial insurers, by an expanded NEIL, or by new international pooling arrangements before the first commercial SMR fleet starts moving modules around.
What’s your view: is the insurance market’s emerging interest in nuclear a sign that the private sector is genuinely confident in SMR safety, or is it mostly an opportunistic bet on a sector where government backstops mean the real downside risk never arrives?