440 Reactors, 10% of World Electricity — The Nuclear Renaissance
Nuclear energy's global story in 2026 is one of remarkable resurgence after a decade of decline. Following the 2011 Fukushima Daiichi accident, global nuclear capacity stagnated as Germany, Japan, and several other countries reduced or reversed their nuclear commitments. But four powerful forces have since converged to trigger a genuine nuclear renaissance: the climate imperative (net-zero carbon commitments requiring 24/7 low-carbon baseload power that solar and wind cannot consistently provide), energy security (Russia's 2022 Ukraine invasion exposed European dependence on Russian natural gas, driving renewed interest in domestic nuclear), AI electricity demand (data centres need uninterrupted carbon-free power that only nuclear and hydroelectric can currently provide at scale), and new reactor technology (small modular reactors promising faster, cheaper construction).
The numbers reflect this revival. Approximately 60 reactors are currently under construction globally — the highest number since the late 1980s. Over 100 additional reactors are in planning stages. Countries that had committed to nuclear phase-outs — Belgium, Japan, South Korea, Sweden — have reversed course. The United States has seen its first new nuclear construction in decades with Vogtle Units 3&4 in Georgia reaching commercial operation. Technology companies including Microsoft, Google, and Amazon have signed nuclear Power Purchase Agreements (PPAs) — a development virtually unimaginable five years ago. The connection between AI infrastructure growth and clean energy demand is directly relevant to trends tracked in our AI market size analysis, where electricity consumption by data centres is projected to roughly double between 2024 and 2028.
As of 2026, nuclear energy generates approximately 2,600 terawatt-hours (TWh) annually — approximately 10% of global electricity from 440 operating reactors across 32 countries with approximately 413 GW of installed capacity. This compares to a peak of approximately 2,660 TWh in 2006 and a post-Fukushima low of approximately 2,350 TWh in 2012. Nuclear is the world's second-largest source of low-carbon electricity after hydropower, and its carbon intensity of approximately 4-12 grams CO₂-equivalent per kWh makes it comparable to wind power and far cleaner than solar, gas, or coal. The total global nuclear industry — encompassing fuel supply, reactor construction, operation, and services — is valued at approximately $400 billion annually.
Nuclear Energy by Country — USA Leads Capacity, France Leads Share
The United States operates 93 nuclear reactors at 54 sites with a total capacity of approximately 95 GW, generating approximately 778 TWh annually — approximately 19% of US total electricity. The US nuclear fleet is the world's largest by absolute generation, though it is also among the oldest — with an average reactor age of approximately 42 years. Several US reactors have received 80-year licence extensions (vs the original 40-year licences), meaning the fleet will remain operational deep into the 2040s-2060s. The US also has approximately $500 billion in nuclear-related infrastructure including national laboratories, uranium enrichment facilities, and fuel fabrication plants that underpin both the civilian nuclear programme and the national security nuclear complex. The relationship between US energy production economics and broader market dynamics is explored in our US fossil fuel consumption analysis.
France operates 56 reactors with approximately 61 GW of capacity — generating approximately 70% of French electricity, the world's highest nuclear share of any large economy. France's nuclear programme was constructed rapidly between 1974 and 1999 using standardised Pressurised Water Reactor (PWR) designs, which enabled economies of repetition that kept costs lower than the bespoke approach used in the US and UK. France is consistently the world's largest net electricity exporter, selling surplus nuclear power to Germany, the UK, Belgium, Italy, and Switzerland. However, France's reactor fleet requires significant maintenance investment — approximately 32 reactors experienced corrosion issues in 2022-2023, temporarily reducing output before repairs were completed. The French government has announced construction of 6 new European Pressurised Reactors (EPRs) plus 8 additional contingent on the first batch's progress.
China has transformed itself from a modest nuclear power (13 reactors in 2013) into the world's third-largest nuclear operator (55+ reactors as of 2026) in just over a decade — and is building the fastest. China's 28 reactors under construction represent the world's most ambitious nuclear programme, with approximately 6-8 new reactors receiving grid connection approval each year. China is targeting 150 GW of nuclear capacity by 2035 — which would make it the world's largest nuclear power producer, surpassing the United States. China is deploying both foreign-derived designs (Westinghouse AP1000, French EPR) and indigenous designs (the Hualong One/HPR1000, which it is also exporting internationally). The enormous energy infrastructure demands of data centres and digital infrastructure in China are a significant driver of this nuclear expansion.
Nuclear Electricity Generation by Country — 2025 (TWh)
The navy bar chart below shows the top 15 countries by nuclear electricity generation. The USA's dominant absolute position — driven by 93 reactors running at high capacity factors — contrasts with France's much smaller fleet generating a far higher share of national electricity.
Nuclear Share of National Electricity — Top Countries (%)
The white animated bars below show nuclear energy's share of total national electricity generation for the world's top nuclear-dependent countries. France's extraordinary 70% share dwarfs all other large economies, while Slovakia, Ukraine, and Hungary also show unusually high nuclear dependence.
~60 Reactors Under Construction — China Leads, Global Pipeline Strongest Since 1980s
Approximately 60 nuclear reactors are under construction worldwide as of early 2026 — the largest global pipeline since the late 1980s and a clear indicator of nuclear's renewed momentum. China accounts for approximately 28 of these reactors — nearly half the global total — reflecting its extraordinary state-directed nuclear expansion programme. India follows with approximately 7 reactors under construction, including 4 units at the Rawatbhata site and 2 units of the Prototype Fast Breeder Reactor (PFBR) programme. South Korea (3), Russia (3), and Turkey (4 — the Akkuyu plant being built by Russia's Rosatom) are also significant contributors to the global construction pipeline.
In Western markets, nuclear construction has been more challenging. The UK's Hinkley Point C — two 1,630 MW EPR units being built by EDF in Somerset, England — is currently the largest nuclear construction project in the Western world, with an estimated cost that has risen from approximately £18 billion (2016 estimate) to approximately £32-35 billion. Hinkley Point C is expected to begin generating electricity in the late 2020s. In the United States, the Vogtle Units 3&4 in Georgia — the first new US nuclear units in approximately 30 years — reached commercial operation in 2023-2024 after significant cost overruns (total cost approximately $35 billion for 2.2 GW, versus the original $14 billion estimate). These cost experiences in Western markets have strengthened the case for small modular reactors (SMRs) as an alternative approach. The significant capital investment requirements of nuclear construction are comparable in scale to the infrastructure commitments discussed in our analysis of global financial markets and capital allocation patterns.
Outside China, the most exciting new-build pipelines are in Eastern Europe and the Middle East. Poland — historically 100% dependent on coal — has selected Westinghouse AP1000 technology for its first-ever nuclear power plant, targeting first generation in the mid-2030s. The UAE's Barakah plant has 3 of its 4 units now in commercial operation, making the UAE the Arab world's first nuclear power generator. Egypt, Bangladesh, and Turkey are all proceeding with Rosatom-built plants under intergovernmental agreements with Russia. Sweden and Finland are both planning new nuclear capacity to support their energy security and decarbonisation objectives. The broader energy context — including the interplay between nuclear, fossil fuels, and renewables in national energy mixes — relates to the fossil fuel consumption patterns we track in our fossil fuel analysis.
Reactors Under Construction by Country — 2026
The white rank bars below show the number of reactors under construction by country as of early 2026. China's overwhelming dominance of the global nuclear construction pipeline is immediately apparent — China alone is building nearly as many reactors as the rest of the world combined.
Nuclear Economics — Cheap When Running, Expensive to Build New
The economics of nuclear power are defined by a fundamental dichotomy: existing plants are among the cheapest electricity sources in operation, while new plants in Western markets have become among the most expensive to build. This dichotomy creates a complex policy environment — extending the life of existing nuclear plants is economically compelling, but building new large nuclear plants in the US or UK has proven financially challenging.
For existing nuclear plants — where construction costs are largely sunk — the operational economics are highly attractive. US nuclear plants generate electricity at approximately $30-50 per megawatt-hour (MWh), making them competitive with or cheaper than most other dispatchable electricity sources. Operating costs are predominantly fuel (uranium) and maintenance — uranium fuel costs approximately $5-8/MWh of nuclear generation, exceptionally low compared to natural gas ($20-50/MWh depending on gas prices). This cost advantage means that US nuclear plants that would otherwise be uneconomic to operate have received state and federal subsidies to remain open — a recognition that the 24/7 carbon-free electricity they provide has value beyond simple LCOE comparisons. The economic role of nuclear in national energy systems connects to the broader analysis of how the world's largest economies are decarbonising their electricity grids.
For new large nuclear plants, construction costs have proven highly variable. South Korea and China construct new nuclear at approximately $3,000-5,000 per kilowatt (kW) of capacity — delivering competitive LCOEs of approximately $50-70/MWh. By contrast, the Vogtle Units 3&4 in the US cost approximately $16,000/kW, and Hinkley Point C in the UK is on track for approximately £19,000-20,000/kW — among the highest construction costs ever recorded for a power plant. These Western overruns reflect the loss of nuclear construction supply chains and workforce expertise following decades without new build, regulatory complexity, first-of-a-kind construction risks, and inflation. Restoring Western nuclear competitiveness is a key policy challenge — and a primary rationale for the SMR approach. The chemical industry's nuclear-related product streams — from zircaloy fuel cladding to reactor coolant chemicals — are directly tied to the nuclear construction and operating cost structure.
Nuclear Generation Cost — LCOE by Country and Reactor Type ($/MWh)
The white line chart below compares the levelised cost of electricity (LCOE) for nuclear energy across different countries and reactor types, illustrating the extraordinary gap between East Asian construction economics and Western market costs for new build.
Small Modular Reactors — The Technology That Could Transform Nuclear
Small Modular Reactors (SMRs) — defined as reactors with an output below 300 megawatts electric (MWe) — are the most significant potential transformation in nuclear technology since the development of Pressurised Water Reactors in the 1950s. Over 80 SMR designs are in development globally as of 2026, ranging from scaled-down versions of conventional PWR technology to radical new concepts including molten salt reactors, high-temperature gas reactors, and fast neutron reactors. The core promise of SMRs is factory manufacturing — building reactor modules in controlled factory environments and shipping them to site, rather than constructing bespoke plants from scratch in the field. This approach could theoretically reduce construction costs, construction times, and the risk of the cost overruns that have plagued large nuclear projects in Western markets.
The most advanced commercial SMR projects include NuScale Power (USA) with its VOYGR 77 MWe module — the first SMR design to receive Nuclear Regulatory Commission (NRC) design approval — though NuScale's first commercial project (Carbon Free Power Project in Idaho) was cancelled in 2023 due to cost increases. Rolls-Royce SMR (UK) is developing a 470 MWe PWR-based design targeting £2.5 billion per unit at scale. GE Hitachi's BWRX-300 is among the most commercially advanced globally, with commitments from utilities in Canada, Poland, the US, and Sweden. X-energy's Xe-100 (high-temperature gas-cooled reactor) is being developed with US Department of Energy support and commitments from Dow Chemical to replace fossil fuel steam at an industrial site in Texas — a potentially transformative application of nuclear heat for industrial decarbonisation, with direct implications for the global chemical industry's energy transition.
The technology giant interest in SMRs is transformative for the industry's commercial prospects. Microsoft signed a 20-year PPA with Constellation Energy to restart Unit 1 of the Three Mile Island plant as Crane Clean Energy Center in Pennsylvania — operational as of late 2024. Google signed nuclear PPAs with Kairos Power for SMR output beginning in 2030. Amazon has invested in X-energy and signed agreements for SMR power. These deals represent approximately 10+ GW of committed nuclear demand from tech companies — a new class of nuclear customer whose reliability requirements (99.99% uptime for data centres) align perfectly with nuclear's 24/7 availability advantage. The convergence of AI compute demand and nuclear energy represents a structural shift in the energy industry that we track in our analysis of global data centre growth statistics.
SMR Designs in Development — Technology Type Breakdown
The grouped bar chart below shows the count of SMR designs in development globally by reactor technology type, illustrating the extraordinary breadth of innovation occurring across the nuclear sector — from scaled-down conventional PWRs to radical advanced concepts.
Global Nuclear — Full Country Data Table
The sortable table below provides comprehensive nuclear data for all major nuclear nations, including reactors operating, capacity, annual generation, national electricity share, and reactors under construction. Click any column to sort.
| Country | Reactors | Capacity (GW) | Generation (TWh) | Nat'l Share | Building |
|---|---|---|---|---|---|
| 🇺🇸 United States | 93 | 95.5 GW | 778 TWh | ~19% | 0 |
| 🇫🇷 France | 56 | 61.4 GW | ~340 TWh | ~70% | 2 |
| 🇨🇳 China | 55+ | 57.0 GW | ~432 TWh | ~5% | 28 |
| 🇷🇺 Russia | 37 | 29.4 GW | ~215 TWh | ~20% | 3 |
| 🇰🇷 South Korea | 26 | 26.0 GW | ~180 TWh | ~30% | 3 |
| 🇨🇦 Canada | 19 | 14.1 GW | ~96 TWh | ~15% | 0 |
| 🇺🇦 Ukraine | 15 | 13.8 GW | ~88 TWh | ~55% | 2 |
| 🇬🇧 United Kingdom | 9 | 5.9 GW | ~43 TWh | ~15% | 2 |
| 🇯🇵 Japan | 12* | 11.2 GW* | ~75 TWh | ~9% | 2 |
| 🇩🇪 Germany | 0 | 0 GW | 0 TWh | 0% | 0 |
| 🇮🇳 India | 23 | 7.5 GW | ~47 TWh | ~3% | 7 |
| 🇧🇪 Belgium | 7 | 5.9 GW | ~43 TWh | ~46% | 0 |
| 🇸🇪 Sweden | 6 | 6.9 GW | ~55 TWh | ~29% | 0 |
| 🇸🇰 Slovakia | 5 | 2.3 GW | ~17 TWh | ~59% | 2 |
| 🇦🇪 UAE | 3 | 4.0 GW | ~22 TWh | ~20% | 1 |
Germany completed its nuclear phase-out in April 2023, shutting down its last three operating reactors (Isar 2, Emsland, Neckarwestheim 2 — total ~4 GW). The decision — accelerated following Fukushima in 2011 — replaced approximately 60 TWh of zero-carbon electricity annually. The immediate result was a significant increase in German gas and coal consumption to fill the gap, raising German power sector CO₂ emissions in 2023 compared to the counterfactual of keeping the plants open. A peer-reviewed study estimated the German nuclear phase-out has cost approximately €12 billion in additional carbon damage and thousands of premature deaths from fossil fuel air pollution. The German experience has become a cautionary case study in global energy policy — cited repeatedly by countries reconsidering nuclear phase-outs. Several German economists and climate scientists have publicly stated the phase-out was an error from a climate perspective.
Global Nuclear Energy — Key Statistics at a Glance
Global Nuclear Forecast 2030 — Capacity to Reach 500 GW, Renaissance Accelerating
Global nuclear capacity is projected to grow from approximately 413 GW (2026) to approximately 480-520 GW by 2030, driven primarily by China's construction programme, Indian expansion, and reactor life extensions in the United States and Europe. By 2035, capacity could reach 550-600 GW if current construction pipelines progress on schedule. The IEA's Net Zero by 2050 scenario envisions global nuclear capacity reaching approximately 800-900 GW by 2050 — more than double the current level — as nuclear provides the baseload carbon-free power that intermittent renewables cannot consistently supply.
The most significant near-term growth drivers are well-established. China's addition of 6-8 reactors per year will drive its fleet from approximately 57 GW to approximately 150 GW by 2035. India's ambitious target of 22.5 GW by 2031 (from 7.5 GW currently) requires completing 7 reactors under construction and building several new sites. South Korea — which had planned to phase out nuclear under the previous government — has now reversed course and committed to maintaining nuclear at approximately 30% of the electricity mix through 2038 and beyond, with new builds likely. Eastern European countries including Poland, Romania, Czech Republic, and Bulgaria are all progressing with new nuclear projects — recognising that the continent's energy security requires diversification away from Russian gas imports. The relationship between nuclear energy expansion and economic development in the world's largest economies makes nuclear capacity a key leading indicator of industrial energy security planning.
The SMR wildcard could significantly accelerate nuclear growth beyond these baseline projections. If BWRX-300, Rolls-Royce SMR, or another design achieves commercial deployment with costs near initial targets, the 2030s could see an SMR construction wave comparable in scale to the wind and solar buildout of the 2010s. The technology companies that have signed nuclear PPAs — representing cumulative demand potentially exceeding 20 GW by 2040 — are effectively pre-funding the SMR industry's commercial scale-up. The role of digital economy growth in driving electricity demand — and therefore nuclear investment — is a crucial structural driver that few energy analysts adequately captured even five years ago.
Frequently Asked Questions — Global Nuclear Energy
As of 2026, there are approximately 440 operating nuclear reactors across 32 countries, with a total installed capacity of approximately 413 gigawatts (GW). Approximately 60 additional reactors are under construction globally, predominantly in China (28), India (7), South Korea (3), and Russia (3). The US has the largest fleet (93 reactors), followed by France (56), China (55+), Russia (37), and South Korea (26). Global nuclear capacity peaked at ~395 GW in 1996, dipped post-Fukushima, and has since recovered and expanded past its previous peak.
Nuclear energy provides approximately 10% of global electricity, generating approximately 2,600 TWh annually out of ~28,000-29,000 TWh total. This share peaked at approximately 17.5% in 1996 and fell through the 2000s-2010s. It has stabilised since ~2016 and is projected to grow toward 12-15% by 2040 as new capacity comes online in China, India, and Eastern Europe. Nuclear is the world's second-largest low-carbon electricity source after hydropower, ahead of wind and solar in absolute generation terms.
The United States has the world's largest nuclear fleet with 93 reactors at 54 sites, generating approximately 778 TWh/year (~19% of US electricity). By nuclear electricity share, France leads at approximately 70% from 56 reactors. By construction pace, China leads with 28 reactors under construction and the world's fastest-growing nuclear fleet. By 2035, China is targeting 150 GW — which would make it the world's largest nuclear electricity producer by capacity, surpassing the United States.
France generates approximately 70% of its electricity from nuclear power — the highest share of any large economy. France operates 56 reactors across 18 sites with total capacity of approximately 61 GW. France's nuclear programme was built rapidly 1974-1999 using standardised PWR designs enabling economies of repetition. France is the world's largest net electricity exporter, selling surplus nuclear power to Germany, UK, Belgium, Italy, and Switzerland. The French government has committed to building 6 new EPR reactors, with potentially 8 more, targeting continued high nuclear share through 2050.
China has approximately 28 nuclear reactors under construction as of 2026 — the world's largest nuclear construction programme. China's fleet has grown from 13 reactors (2013) to 55+ (2026). China receives grid connection approval for approximately 6-8 new reactors annually. The national target is 150 GW by 2035 and 200+ GW by 2050. China deploys both foreign-derived designs (Westinghouse AP1000, French EPR) and its own Hualong One (HPR1000) which is also being exported internationally to Pakistan and Argentina.
SMRs are nuclear reactors below 300 MWe output — smaller than conventional plants (1,000-1,600 MWe). The key advantage is factory manufacturing — building modular reactor components in controlled factory environments then shipping to site, theoretically reducing construction time and cost. Over 80 SMR designs are in development globally. The most advanced commercially include the BWRX-300 (GE Hitachi), Rolls-Royce SMR (UK), and X-energy Xe-100. First commercial deployment expected late 2020s to early 2030s. Tech companies (Microsoft, Google, Amazon) have signed nuclear PPAs targeting SMR output from ~2030.
Nuclear energy produces approximately 4-12 grams of CO₂ equivalent per kWh on a full life-cycle basis — comparable to wind (7-15 gCO₂/kWh) and much lower than solar (20-50), gas (400-490), or coal (820-1,050). The modest lifecycle carbon comes from uranium mining, reactor manufacturing, and decommissioning — not electricity generation itself, which produces zero direct CO₂ emissions. The IPCC consistently identifies nuclear as a key low-carbon technology for limiting warming to 1.5°C. Nuclear is categorised as a sustainable activity in the EU Taxonomy for sustainable finance.
The March 2011 Fukushima Daiichi disaster triggered significant nuclear policy changes globally. Japan shut all 54 reactors by May 2012; approximately 12 have restarted as of 2026. Germany accelerated its phase-out, closing all nuclear plants by April 2023. Belgium, Switzerland, and Taiwan announced phase-outs. However, the global impact was less severe than feared — France maintained its fleet, South Korea continued building, China's programme paused briefly. Global nuclear generation fell ~11% in 2011-2012 but has since recovered. Most strikingly, many countries that announced phase-outs post-Fukushima (Belgium, Japan, South Korea, Sweden) have since reversed course — recognising nuclear's role in energy security and decarbonisation.
Nuclear is statistically one of the safest energy sources per unit of energy generated. Life-cycle studies show nuclear causes approximately 0.03-0.07 deaths per TWh — similar to wind (0.04) and solar (0.02-0.03), and far safer than coal (24.6), oil (18.4), and gas (2.8). Even including the major accidents at Chernobyl (1986, ~30-60 direct deaths, disputed long-term cancer toll of 4,000-60,000) and Fukushima (2011, zero confirmed direct radiation deaths, ~2,200 evacuation-related deaths), nuclear remains far safer per unit of energy than fossil fuels when accounting for ongoing air pollution mortality. The WHO estimates air pollution from fossil fuel combustion causes approximately 7 million deaths annually worldwide.
Nuclear LCOE varies enormously by market and plant type. Existing US nuclear plants: approximately $30-50/MWh — among the cheapest dispatchable electricity. New large nuclear in South Korea/China: approximately $50-70/MWh at $3,000-5,000/kW construction cost. New large nuclear in the US: approximately $130-180/MWh post-Vogtle overruns (~$16,000/kW). New large nuclear in the UK (Hinkley Point C): approximately £90-100/MWh ($110-130/MWh) at current cost trajectory. SMRs are projected to reach $60-90/MWh once manufacturing scales up in the 2030s. The cost competitiveness gap between Asian and Western new nuclear builds is the defining challenge of the global nuclear renaissance.
Global uranium mine production totals approximately 48,000-52,000 tonnes of uranium (tU) annually. Kazakhstan leads at approximately 43% of global output (~21,000 tU/yr). Canada is second (~7,000-8,000 tU/yr) from the Athabasca Basin's high-grade deposits. Namibia, Uzbekistan, Russia, Australia, and Niger are also significant. Global reactors require approximately 67,000-69,000 tU annually — the gap between mine supply and demand is met by secondary sources (reprocessed uranium, inventory drawdown). Uranium prices rose from approximately $25/lb (2020) to ~$100/lb (2024) driven by nuclear renaissance investment and supply chain concerns.
Countries with active nuclear construction in 2026: China (28 reactors), India (7), Turkey (4 — Akkuyu, built by Rosatom), Egypt (4 — El-Dabaa, Rosatom), South Korea (3), Russia (3), UK (2 — Hinkley Point C), France (2 — Flamanville 3 completing), Slovakia (2 — Mochovce 3&4), Bangladesh (2 — Rooppur, Rosatom), UAE (1 — Barakah Unit 4), Ukraine (2), Japan (2). Additionally, Poland, Sweden, Netherlands, Czech Republic, Romania have new nuclear projects in planning/early development stages.
Nuclear's outlook has improved dramatically since 2022. Key drivers: energy security (Russia-Ukraine war), decarbonisation (net-zero commitments need 24/7 carbon-free power), and AI data centre demand (tech companies need uninterrupted clean electricity). The IEA's Net Zero scenario requires nuclear to double to 800-900 GW by 2050. China alone will add ~100 GW by 2035. SMRs could enable a new construction wave in the 2030s. Countries that planned phase-outs (Belgium, Japan, South Korea, Sweden) have reversed course. At the COP28 climate conference in 2023, 22 countries signed a declaration to triple global nuclear capacity by 2050. Nuclear's prospects today are the brightest in 40 years.
Primary: IEA World Energy Statistics & Balances — Nuclear generation by country, electricity share data
Primary: OECD/NEA — Projected Costs of Generating Electricity 2025 Edition
BusinessStats: All country rankings, capacity analysis, LCOE comparisons, SMR technology assessments, and 2030 forecast projections are BusinessStats proprietary research combining IAEA PRIS, IEA, OECD/NEA, BP Statistical Review 2025, Lazard LCOE Analysis v17, and national energy ministry data.