The Global Nuclear Energy Resurgence: Drivers, Distribution, and Proliferation Risk

Bottom Line Up Front (BLUF)

Nuclear energy is undergoing its most significant period of global expansion in several decades, propelled by the convergence of energy-security anxieties, decarbonization commitments, and surging electricity demand from artificial-intelligence infrastructure. High ConfidenceWe assess that this resurgence is structurally durable rather than cyclical, reflecting converging strategic incentives across major and middle powers, but that its ultimate trajectory — whether capacity growth approaches the International Atomic Energy Agency's (IAEA) high-case projection or falls closer to its low-case estimate — will be determined less by political will than by whether flagship reactor programs in the United States and Europe can overcome a two-decade record of cost and schedule overruns. Moderate ConfidenceWe further assess that the expansion of civil nuclear cooperation agreements lacking rigorous, IAEA-verified nonproliferation safeguards, exemplified by the 2026 U.S.–Saudi arrangement, risks eroding the nonproliferation norms established by prior "gold standard" agreements.

Key Judgments

Key Assumptions

Sourcing Statement

This assessment is derived principally from the Council on Foreign Relations explainer "Why Nuclear Energy Is Making a Global Comeback" (21 August 2026), which itself synthesizes data and analysis from the International Atomic Energy Agency, the U.S. Energy Information Administration, the International Energy Agency, the Nuclear Energy Institute, the World Nuclear Association, and on-record commentary from named CFR-affiliated subject-matter experts. No classified reporting informs this product, and AEGIS I AHSAM has not independently verified the underlying primary-source data. Confidence levels are calibrated to the degree of independent corroboration across primary sources cited in the underlying reporting; judgments resting on expert forecasting or inferred policy trajectories, rather than on directly reported statistics, are marked Moderate rather than High.

I. Background: From Post-Chernobyl Stagnation to Renewed Investment

Civilian nuclear power emerged as an international priority in the early 1950s, culminating in the first electricity generated from fission at Idaho's Experimental Breeder Reactor-I in 1951. Development in the United States and much of the industrialized world subsequently slowed through the 1970s and 1980s, a retrenchment reinforced by the 1979 Three Mile Island accident and, more decisively, the 1986 Chernobyl disaster, both of which entrenched durable public apprehension toward the technology. That stagnation persisted through the 1990s even as the underlying case for low-carbon baseload generation strengthened.

Momentum shifted decisively beginning in 2023, when more than twenty governments committed to a global tripling of nuclear capacity by 2050. As of 2024, 417 reactors were operating across thirty-one countries, together supplying approximately nine percent of global electricity — a share most energy analysts expect to expand over the coming decades as national commitments translate into new construction.

II. Structural Drivers of the Resurgence

Three converging pressures underpin the current expansion. First, energy diversification: Russia's 2022 invasion of Ukraine exposed the strategic vulnerability of European dependence on Russian natural gas, while the 2026 Iran war has materially disrupted global oil and gas markets, reinforcing the perceived value of a domestically controllable, weather-independent power source. Second, climate policy: successive years of record heat and destructive wildfires have sharpened government attention to low-carbon baseload alternatives, with the IAEA's high-case projection anticipating installed capacity nearly tripling from 377 GW to 992 GW by 2050, against a low-case projection of roughly fifty percent growth. Third, and increasingly prominent, is demand from artificial-intelligence infrastructure: data centers accounted for roughly half of total U.S. electricity-demand growth in 2025, prompting major technology firms — among them Amazon, Google, Meta, and Microsoft — to conclude nuclear power-purchase arrangements in 2026, a marked shift from their prior reliance on wind and solar procurement.

III. Distribution of Capacity and National Trajectories

Nuclear generating capacity remains concentrated among a small number of states. The United States, China, France, Russia, and South Korea together account for more than seventy percent of global nuclear electricity generation, with the United States alone responsible for approximately thirty percent of the world total. Current U.S. policy sets a goal of quadrupling domestic capacity from roughly 100 GW to 400 GW by 2050, pursued through accelerated construction of ten large-scale reactors and expanded deployment of small modular reactors; independent assessments characterize this timeline as more ambitious than current institutional capacity is likely to support, given the breadth of reactor designs the plan envisions pursuing in parallel.

China presents the most consequential near-term trajectory shift, with nearly forty reactors currently under construction and a stated ambition to overtake the United States as the world's leading holder of nuclear capacity, positioning nuclear power as a second pillar of national energy strategy alongside its established renewables base. In Europe, France continues to lead with roughly seventy percent of its domestic electricity generated from nuclear sources — the highest share of any country — while Hungary and Slovakia are expanding capacity within a 2022 European Parliament framework classifying qualifying nuclear investment as climate-aligned. Elsewhere in Asia, energy disruption stemming from the Iran war has intensified interest in nuclear power as a hedge against imported oil and liquefied natural gas dependence.

IV. Risk Dimensions: Safety, Economics, and Proliferation

Three distinct risk categories condition the pace and shape of the resurgence. On safety, long-term radioactive waste storage remains an unresolved technical and political challenge, and the location of nuclear facilities within or near active conflict zones introduces acute additional risk, illustrated by continuing safety concerns surrounding Ukraine's Zaporizhzhia plant amid sustained proximity to hostilities. On economics, cost and schedule performance constitute the most consistent constraint on expansion: no large-scale nuclear plant outside China, Russia, or South Korea has been completed on time and on budget over the past two decades, with development in the United States and Europe characterized in expert commentary as severely underperforming relative to initial projections.

On proliferation, the dual-use character of nuclear technology means that civilian programs can, depending on a state's fuel-cycle choices, security arrangements, and governance quality, provide a technical pathway toward weapons-usable material. This concern has resurfaced prominently following the July 2026 signing of a U.S.–Saudi civil nuclear cooperation agreement, whose disclosed terms fall short of the nonproliferation controls, inspection provisions, and IAEA-involvement standards established under the 2009 U.S.–UAE agreement, an arrangement widely regarded within the nonproliferation community as the sector's benchmark. Analysts assess that the Saudi agreement, as announced, represents a meaningful policy shift away from that benchmark rather than a continuation of it.

V. Public Opinion and Long-Term Outlook

Public sentiment has moved in step with policy momentum. Survey research indicates that a majority of the American public — more than seventy percent in a 2025 industry-sponsored poll — now favors nuclear energy, a reversal from the skepticism that characterized the 1980s and 1990s, with subsequent polling in 2026 indicating continued growth in support. Analysts attribute part of the current urgency to the multi-decade slowdown in reactor construction, which is now understood to have deferred capacity investment that must be recovered through either accelerated new build or extended operation of the existing fleet, with some reactors now projected to operate for approximately eighty years.

VI. Three Forward Scenarios

Three trajectories frame the plausible outlook to 2050, consistent with standard structured-scenario methodology.

VII. Outlook and Recommended Indicators

The underlying CFR analysis suggests that the resurgence's durability is substantially more assured than its ultimate scale, given that the principal binding constraint — construction economics — has not meaningfully improved despite two decades of policy attention. Analysts consulted for the underlying reporting further suggest that nonproliferation safeguards attached to new civil nuclear agreements, rather than the pace of reactor construction itself, may prove the more consequential variable for regional security outcomes over the coming decade.

Indicators to Watch