What nuclear due diligence actually requires

Nuclear M&A has entered a new phase of activity. Indeed, the value of mergers and acquisitions involving the global nuclear industry in the first half of 2026 doubled to $7 billion compared with a year earlier. The European, Middle East and Africa region saw an aggregate increase in deal values from USD1.2 billion in the first half of 2025 to USD3 billion in the first half of this year.

The transactions driving this surge are structurally varied: technology acquisitions, operating asset purchases, life-extension deals, and strategic stakes in SMR developers. What they share is an accelerated pace that outruns the analytical capabilities most acquirers bring to the process.

Standard M&A due diligence is built around a set of assumptions that hold reasonably well for most industrial assets: that the financial statements capture the material liabilities, that auditing approach is too often procedural rather than substantive, that operational risk is bounded by the asset’s recent performance history, and that integration is primarily an organisational challenge. In nuclear, none of these assumptions is reliably true.

The question in any nuclear transaction is not just what an asset is worth. It is what obligations come with it, and whether the acquiring organisation has the capability to manage them. Most acquirers find out the answer to that second question after closing. This article sets out a framework for finding it before. 

Why the nuclear M&A moment creates analytical risk

The combination of factors driving nuclear M&A, rising electricity demand from data centres, energy security pressures, the return of policy support for nuclear in major OECD markets, and the entrance of new capital seeking exposure to the sector, is creating deal flow at a pace that the industry has not seen for decades.
Constellation Energy’s merger with Calpine created a combined entity of approximately $27 billion. BWX Technologies acquired Kinectrics for $525 million in January 2025. Across the advanced reactor sector, venture and private equity capital is transacting at record speed.

Deal velocity and analytical rigour are in tension. The due diligence processes that are becoming standard in other energy sectors (solar, wind, storage) have been refined by two decades of transaction experience and a relatively standardised set of risks. Nuclear due diligence does not have that foundation. The asset class is heterogeneous: operating reactors, decommissioning assets, technology companies, fuel cycle businesses, and service providers each presenting materially different risk profiles. The regulatory environment is jurisdiction-specific and non-transferable. And the liabilities, decommissioning obligations, spent fuel management costs, legacy workforce commitments, operate on timescales that sit outside the horizon of a standard investment thesis.

A 2025 analysis of global M&A due diligence trends found that due diligence exercises had become noticeably longer across all sectors, with record volumes of documents disclosed in data rooms and many potential transactions aborted as a result of matters uncovered during the process. In nuclear, the stakes of inadequate due diligence are higher than in most sectors, not only because the transactions are large, but because the liabilities that can be missed are not bounded by the size of the deal.

Three categories of risk that generic frameworks miss

The failure modes in nuclear due diligence cluster around three categories of risk that standard M&A analytical frameworks are structurally ill-equipped to assess.

Regulatory risk
Nuclear licence transfer is not a procedural step. In the United States, the NRC has reviewed more than 115 licence transfer applications since 1999, and its review focuses substantively on the financial qualifications of the acquirer and the adequacy of its decommissioning funding arrangements. The transfer process involves regulators assessing whether the incoming owner has the financial and operational capacity to meet the obligations that attach to the licence, not merely whether the transaction is commercially structured. This means that a technically sound deal can fail at the regulatory stage if the acquirer cannot demonstrate sufficient technical capability or financial depth. In jurisdictions outside the US, the regulatory transfer pathway varies significantly in scope, timeline, and outcome certainty, adding a layer of cross-border complexity that generic deal structures are not designed to absorb.

Liability risk
The liabilities attached to nuclear assets are large, long-duration, and frequently underestimated at the point of acquisition. The US Nuclear Regulatory Commission estimates that decommissioning a single reactor costs between $280 million and $612 million. Across the US fleet, decommissioning trust funds hold approximately $100 billion — but an estimated $9 billion of unfunded liability remains, to be collected over the remaining operating lives of approximately 100 reactors. In the UK, the estimated cleanup cost of legacy nuclear facilities ranges from £99 billion to £232 billion, with a best discounted estimate of £131 billion.

Spent fuel obligations are a separate and compounding variable. In the United States, the Department of Energy’s estimated liability for its failure to accept and dispose of commercial spent fuel reached $56.5 billion in 2025, growing as the national inventory increases by approximately 2,000 metric tons per year. For an acquirer of an operating nuclear asset, the spent fuel management obligation is a long-duration cost that does not appear on the asset’s income statement and is frequently underweighted in standard financial modelling.

Operational risk
The performance of a nuclear asset is inseparable from the capability of the organisation that operates it. Safety culture, workforce depth, maintenance regime, regulatory relationship, and the institutional knowledge embedded in the operating team are not visible in financial statements and do not transfer automatically with the asset. The operating licence is held by the licensee, not the asset, and the regulator’s assessment of licence holder capability is ongoing. An acquirer that does not assess operational capability as rigorously as financial performance is acquiring an asset it cannot reliably value.

Three lenses. One integrated view.

A rigorous nuclear due diligence framework requires three analytical lenses to be applied concurrently, not sequentially. The sequential model, financial analysis first, operational assessment second, strategic fit review third, is the standard approach in most M&A processes. In nuclear, it is inadequate, because the three dimensions are interdependent in ways that sequencing does not reveal.

Financial analysis through a nuclear-specific lens
Financial due diligence in nuclear must extend beyond the standard scope of revenue, cost, and balance sheet analysis to encompass: the funded status and actuarial assumptions of decommissioning trust funds; the cost basis and projected future costs of spent fuel management; the financial qualification requirements of the jurisdiction’s regulatory licence transfer process; and the relationship between asset performance history and the regulatory cost basis on which future revenue will be determined. Each of these elements requires specialist input that is not available in a standard financial due diligence team.

Operational assessment
The operational assessment must address questions that do not appear in standard technical due diligence:
What is the safety culture of the operating organisation, and how does the regulator assess it?
What is the depth and age profile of the workforce, and what loss of knowledge risk exists?
What is the maintenance backlog, and how does it compare to industry benchmarks?
What are the current and projected regulatory compliance costs?
How does the asset’s performance compare to peer facilities in the same jurisdiction?
These questions require nuclear operational expertise that most M&A advisory teams do not carry.

Strategic fit evaluation
The strategic rationale for a nuclear acquisition, whether it is clean electricity offtake, technology access, service market position, or geographic expansion, must be tested against the integration requirements that the acquisition imposes.
Can the acquiring organisation absorb the regulatory obligations? Does it have the operational capability to manage a nuclear licence? Is the integration timeline consistent with the regulatory process? Does the acquirer’s existing portfolio create any regulatory concentration risk? Strategic fit in nuclear is not only a question of commercial logic. It is a question of whether the acquiring organisation can become a responsible nuclear operator.

The integration question as a threshold condition

The most consequential due diligence question in any nuclear transaction is one that most acquirers ask too late: does our organisation have the capability to manage what we are about to own?

This is not a question about management bandwidth or integration resource. It is a question about whether the acquiring organisation can operate a nuclear facility in compliance with its licence, in a relationship with a regulator that will assess that compliance continuously, with a workforce whose institutional knowledge must be preserved through a change of ownership, and against a liability profile that will remain with the asset for decades after the transaction closes.

Regulators in most nuclear jurisdictions assess this question explicitly. The NRC’s licence transfer review considers whether the incoming owner has the financial qualifications and organisational capability to assume the responsibilities of a nuclear licensee. An acquirer that cannot answer this question credibly to the regulator will not complete the transaction regardless of how well-structured its commercial terms are.

The most successful nuclear acquirers in the current transaction wave share a characteristic that distinguishes them from unsuccessful bidders: they build their operational capability assessment in parallel with their financial due diligence, and they use that assessment both to inform their valuation and to design their post-closing integration plan before the transaction completes.

What rigorous nuclear due diligence looks like in practice

Translating the three-lens framework into a due diligence process requires structural choices that most M&A processes do not make by default.

Nuclear-specific expertise must be embedded in the core deal team, not retained as an external specialist function consulted only on discrete questions. The interdependence of the financial, operational, and regulatory dimensions means that insights from one lens must continuously inform the others. A finding in the operational assessment about workforce age profile changes the actuarial assumptions in the decommissioning liability model. A finding in the regulatory assessment about the jurisdiction’s spent fuel policy changes the financial provision calculation. These interactions cannot be captured by sequential review.

The due diligence scope must extend beyond the asset to include the regulatory relationship. Understanding how the regulator views the current licensee, its compliance history, its safety culture assessments, its outstanding regulatory commitments, is essential to assessing both the licence transfer risk and the post-closing operational challenge. This information is not in the data room. It requires direct engagement with public regulatory records, inspection reports, and enforcement histories that are available but require specialist interpretation.

The integration plan must be designed before closing, not after it. The period between signing and closing in a nuclear transaction is not a period of commercial continuity. It is a period when the regulatory transfer process is underway, the workforce is aware of the change in ownership, and the asset’s operational risk is at its highest. Acquirers that arrive at closing without a detailed operational integration plan, covering workforce retention, regulatory relationship management, and the first hundred days of new ownership, are taking a risk that the financial modelling has not priced.

The standard that nuclear transactions require

The surge in nuclear M&A activity is a rational response to a genuine market opportunity: assets that generate firm, dispatchable, low-carbon electricity at a time when that combination is increasingly scarce and valuable. The transactions are commercially sound. The due diligence frameworks being applied to them frequently are not.

Nuclear assets are not simply industrial assets with additional regulatory requirements. They are operating systems with long-duration liabilities, continuous regulatory oversight, and performance characteristics inseparable from the capabilities of the organisation that manages them. Generic M&A due diligence is not designed to assess these characteristics reliably.

The organisations that will create durable value in nuclear M&A are those that recognise this distinction early,  and build the analytical capability to close it before they close the deal.