Let's talk about nuclear power plants. Not in a scary, sci-fi movie way, but in a real, on-the-ground, "where are they and what are they doing" way. If you're looking for a list of nuclear power plants in the world, you've probably hit a wall of outdated PDFs or dense government databases. I've been tracking this sector for over a decade, and the biggest mistake people make is treating this list as static. It's not. It's a living snapshot of global energy strategy, politics, and technology. As of my latest review based on data from the International Atomic Energy Agency (IAEA), there are about 410 operational nuclear power reactors across more than 30 countries, with another 50 or so under construction. But that number changes. Plants retire, new ones come online, and others get life extensions. This guide isn't just a copy-paste of names; it's a breakdown of the status, the trends, and the specific details you actually need to understand the global nuclear landscape.

Where to Jump In

Nuclear Power Plants by Country: A Global Breakdown

Looking at a simple count of reactors tells one story, but looking at the share of electricity generation tells another. The United States has the most reactors (93), but France gets about 70% of its electricity from nuclear—the highest share in the world. Here’s a snapshot of the key players. This data is compiled from the IAEA's Power Reactor Information System (PRIS), which is the gold standard for this kind of information.

Country Operable Reactors Net Electrical Capacity (MWe) Nuclear Share of Electricity Notable Fact
United States 93 ~95,500 ~19% Home to the oldest operating fleet; many reactors have received 20-year license extensions.
France 56 ~61,000 ~70% World leader in nuclear dependence; major national debates on future energy mix.
China 55 ~53,000 ~5% Most aggressive builder, with over 20 reactors under construction. Capacity is growing fast.
Russia 37 ~27,500 ~20% A major exporter of nuclear technology (e.g., Rosatom projects in Turkey, Bangladesh, Egypt).
South Korea 25 ~24,500 ~30% Has a strong domestic supply chain; policy has swung between phase-out and support.
India 23 ~7,000 ~3% Pursuing a largely indigenous nuclear program with plans for significant expansion.
Canada 19 ~13,600 ~15% Uses unique CANDU heavy-water reactor design, which can use different fuel types.
Ukraine 15 ~13,100 ~55% Historically reliant on nuclear; faces immense challenges due to the war with Russia.
United Kingdom 9 ~5,900 ~15% Most existing plants are aging; financing new builds (like Hinkley Point C) is a key issue.
Japan 33 (10 operable) ~31,700 (10,500 operable) ~7% Fleet largely idled post-Fukushima; slow, contentious restart process underway.

See Japan's entry? That's crucial. They have 33 reactors technically "in existence," but only about 10 are actually generating power as of this writing. The rest are in various stages of shutdown, decommissioning, or awaiting restart approval. This is why understanding status is everything. A raw count without context is misleading.

Then there are countries like Germany, which officially phased out its last reactors in 2023, and Belgium, which has delayed its planned phase-out several times. The list is a map of political will as much as engineering.

The World's Largest Nuclear Power Plants

When people search for the "largest nuclear power plant," they usually mean the one with the highest generating capacity. It's a title that has changed hands a few times. For years, it was Japan's Kashiwazaki-Kariwa plant (7 reactors, 7,965 MWe net), but its extended shutdown since 2011 means it's not currently producing. So, in terms of operational capacity, the crown sits elsewhere.

The Current Title Holder: The Kori Nuclear Power Plant in South Korea (specifically, the Shin-Kori units 3 & 4) is often cited among the largest single-site complexes. However, when measuring total installed capacity of a single site that is actively generating, the Hanul Nuclear Power Plant (also South Korea) and Bruce Nuclear Generating Station in Canada are giants. Bruce, with its 8 CANDU reactors, has a net capacity of over 6,500 MWe and is arguably the largest fully operational nuclear facility in the world by total output.

What Makes a Plant "Large"?

It's not just about the number of reactors. It's about the combined net electrical capacity (MWe). A site with four newer, more powerful reactors can out-produce a site with eight older, smaller ones. The new generation of reactors, like the EPRs being built in Europe and China or the AP1000s, have single-unit capacities of around 1600 MWe. One of these can produce more than two or three older 600 MWe units.

China's Yangjiang Nuclear Power Station and Taishan Nuclear Power Plant (home to the world's first operational EPR reactors) are perfect examples of modern, high-capacity facilities rapidly climbing the "largest" rankings.

Understanding Reactor Status: More Than Just On/Off

This is where most public lists fail. They might tell you a plant exists, but not what it's actually doing. In the industry, we track several key statuses that dramatically affect whether a plant is on the "active" list.

Operational: The reactor is connected to the grid and producing electricity for commercial use. This is what counts for the "operable" numbers.

Under Construction: Concrete has been poured for the reactor base. Sounds simple, but many "planned" projects never get here. China, India, and Russia host the majority of current construction.

Long-term Shutdown: This is a critical category. The reactor is not producing but is not officially retired. It could be for maintenance, safety upgrades (like in Japan post-Fukushima), or economic reasons (low electricity prices). These reactors are in limbo and could return or be permanently closed.

Permanently Shut Down / In Decommissioning: The reactor has officially ended power operations. The decades-long process of decommissioning—removing fuel, dismantling systems, and eventually releasing the site—begins. The IAEA maintains a separate list for these.

A common misconception? That "shut down" means immediately torn down. The decommissioning process for a large reactor can take 50 years or more. So a plant like Germany's Biblis or the UK's Berkeley are still very much on the physical "list," just in a different phase of their lifecycle.

The list is dynamic. Looking ahead, two major forces will reshape it: retirements in the West and new builds in the East.

In the United States and Europe, many reactors built in the 1970s and 80s are approaching the end of their initial 40-year licensed lifetimes. Utilities are seeking—and often receiving—20-year extensions. Whether they run for 60 or 80 years is an open question that depends on economics and regulation. A wave of retirements is expected from the 2030s onward if new builds don't replace them.

The growth story is in Asia. China's ambition is clear. Countries like Bangladesh (Rooppur plant) and Turkey (Akkuyu plant) are building their first reactors with foreign assistance. The United Arab Emirates successfully started up its first plant at Barakah, a model for newcomer countries.

There's also a new category emerging: Small Modular Reactors (SMRs). These are not on today's list of large nuclear power plants, but they could populate a future list with dozens of smaller units at a single site or distributed across a region. Projects are advancing in the US, UK, Canada, and Russia.

Your Nuclear Plant List Questions Answered

How often is the official global list of nuclear power plants updated?

The IAEA's PRIS database is updated continuously as member states report changes. For public tracking, major organizations like the World Nuclear Association publish comprehensive monthly or annual reports that incorporate this data. Any list you see that's over a year old is almost certainly missing retirements, restarts, or new grid connections.

Why do some lists show different numbers for the same country?

It almost always comes down to the definition of "operational." Does it include reactors in long-term shutdown? What about those that have generated electricity but are currently offline for refueling (which is a normal, scheduled activity)? The most rigorous lists count reactors that are technically capable of operation and licensed to operate, even if they are temporarily offline. Less precise lists might use a snapshot of "reactors connected to the grid right now," which fluctuates daily.

Where can I find a reliable, detailed list of plants under construction?

The IAEA PRIS database has a filter for "Under Construction." For more narrative context, the World Nuclear Association's "World Nuclear Power Reactors & Uranium Requirements" report is excellent. Be wary of "planned" or "proposed" lists—they are speculative. The meaningful milestone is when first concrete is poured for the reactor building base slab.

How long does it take to build a new nuclear power plant today?

This is a huge point of variation. In China and South Korea, standardized designs and experienced workforces have built reactors in about 5-7 years from first concrete to grid connection. In Europe and North America, first-of-a-kind designs, regulatory changes, and project management challenges have seen timelines stretch to 10-15 years or more for recent projects. The industry is hoping SMRs and standardized large designs will bring these times down.

What happens to a nuclear plant after it's shut down? Does it disappear from the list?

It shifts to a different list. Decommissioning is a long, regulated process. The immediate post-shutdown phase (5-10 years) involves removing all the nuclear fuel and storing it in on-site pools or dry casks. The actual dismantling of the reactor and buildings happens much later, often after a safe "storage" period to allow radioactivity to decay. The site remains an industrial nuclear site for decades, so in a physical sense, it doesn't "disappear." It just changes its purpose from generation to cleanup.

So, there you have it. A list of nuclear power plants in the world isn't a phone book. It's a living document of technology, geopolitics, and energy economics. The numbers—410 operational, 50-something building—are a starting point. The real story is in the shifts: which countries are betting big, which are stepping back, and how the definition of a "plant" itself might change with new technologies. Keep an eye on Asia for growth, watch the license renewal decisions in the US and Europe, and remember that status is king. A reactor that isn't running might as well be a very expensive museum piece, at least for the time being.