Nuclear power plant

A nuclear power plant is a special kind of power station where the heat comes from a nuclear reactor. This heat is used to make steam, which turns a turbine connected to a generator to create electricity. As of October 2025, there were 416 nuclear reactors working in 31 countries, with 62 more being built.

Most nuclear power plants use a special kind of fuel called enriched uranium. After about three years, the fuel is removed and cooled in special pools before being stored safely for a very long time. Even though the amount of this used fuel is small, it stays radioactive for hundreds of thousands of years. Some countries, like France and Russia, try to reuse parts of this fuel to make new energy, but this can be costly.

Building a nuclear power plant takes many years and a lot of money. Because of the high building costs, these plants are usually used for steady, continuous power production. Nuclear power plants create electricity with a carbon footprint similar to solar farms and wind farms, and much lower than using fossil fuels like natural gas and coal. They are also very safe, with fewer accidents and pollution compared to many other ways of making electricity.

History

Main article: History of nuclear power

The first time heat from a nuclear reactor was used to make electricity was on December 21, 1951, at the Experimental Breeder Reactor I. It powered just four light bulbs.

Later, on June 27, 1954, the world's first nuclear power station to send electricity to a city's power supply began operating in Obninsk, in the Soviet Union. The first big power station that could also make a material called plutonium opened in Calder Hall, United Kingdom, on October 17, 1956. The first big power station built just to make electricity was the Shippingport Atomic Power Station in Pennsylvania, United States, and it started working on December 18, 1957.

Basic components

Nuclear power plants make electricity by using heat from a nuclear reactor. This heat is used to turn water into steam, which spins a turbine connected to a generator, making electricity. The reactor uses uranium as fuel to create heat through a process called fission.

The reactor is protected by a strong shield to keep radiation contained. A steam turbine changes steam heat into mechanical energy, and an electric generator turns this into electricity. Safety valves help prevent problems like bursts or explosions. Cool water from rivers, lakes, or cooling towers is used to keep the plant running safely.

World operating status

Nuclear power plants create about 10% of the world's electricity. They use around 440 reactors to make this power. These plants are important because they do not add carbon to the air, which helps fight climate change. Many countries use nuclear power, with France getting about 70% of its electricity from these plants.

In 2022, nuclear plants made 2,545 terawatt-hours of electricity. Some countries, like France, Ukraine, Slovakia, Belgium, and Hungary, get a big part of their power from nuclear energy. The United States has improved how its nuclear plants work over the past 15 years. China is building many new nuclear reactors, more than any other country.

Decommissioning

When a nuclear power plant stops working, it must be taken apart and cleaned so it is safe. This process makes sure there is no danger from radiation. After this work is done, the plant is no longer watched by safety rules.

Flexibility

Nuclear plants usually run all the time because it saves money on fuel. But in some places, like France, they change how much power they make to match what people need. Some new ideas include small, floating nuclear plants that can be moved to where they are needed.

Economics

The economics of nuclear power plants is a debated topic, with huge investments depending on the choice of energy source. Nuclear power stations usually have high upfront costs but low fuel costs, as the expenses for fuel processing and storage are included. Comparing nuclear power to other energy sources depends on assumptions about how long it takes to build nuclear plants and how they are financed.

Efforts to reduce global warming, like carbon taxes or trading systems, are making nuclear power more economically attractive. Newer reactor designs promise better fuel efficiency and lower costs, which could help nuclear power compete. However, in places where cheap gas is available, it remains a challenge for nuclear projects to succeed.

After the 2011 Fukushima accident in Japan, costs for nuclear plants increased due to stricter safety requirements. Some newer designs use passive safety systems, which reduce the need for extra backup equipment. According to the World Nuclear Association, nuclear power can compete with other electricity sources, except where very cheap fossil fuels are available. Fuel costs for nuclear plants are small compared to total costs, but building them costs more than coal or gas plants. Nuclear power also has lower system costs than renewable energy sources that don't produce power all the time.

Safety and security

Modern nuclear power plants have many safety features to keep them safe. They cannot explode like a nuclear weapon because the fuel is not strong enough for that. These plants need constant temperature control to stop a core meltdown, which is when the reactor gets too hot and can release harmful radiation. Safety measures are in place to protect against theft of nuclear material and attacks.

Some of the most serious accidents in the past include the 1979 Three Mile Island accident, the 1986 Chernobyl disaster, and the 2011 Fukushima Daiichi nuclear disaster. These happened when older types of reactors were in use. Experts have noted that complex nuclear systems can sometimes have unexpected failures that are hard to prevent.

Regulation and oversight

Nuclear power has special rules to protect people and the environment. These rules are based on international agreements like the Paris Convention on Third Party Liability in the Field of Nuclear Energy, the Brussels supplementary convention, and the Vienna Convention on Civil Liability for Nuclear Damage. However, some countries with many nuclear power plants, such as the United States, Russia, China, and Japan, do not follow these international agreements.

In the United States, a special law called the Price-Anderson Nuclear Industries Indemnity Act helps manage risks for nuclear accidents. In the United Kingdom, the 1965 Nuclear Installations Act sets rules for paying for damage caused by nuclear incidents. This law says the company running the plant must pay up to £150 million for ten years after an incident. After that, the government helps pay any remaining costs. The government also pays for certain costs if damage affects other countries, based on international agreements.

Controversy

The debate about using nuclear power to create electricity became very strong in the 1970s and 1980s in some countries.

Some people support nuclear power because they believe it is a sustainable energy source that reduces carbon emissions and can help countries rely less on fuels from other places. They say nuclear power creates almost no air pollution compared to fossil fuels and can help countries become energy independent. They also think the risks of storing waste are small and that newer technology makes nuclear plants very safe.

Others worry that nuclear power can harm people and the environment. They are concerned about risks from uranium mining, the chance of nuclear weapons spreading, and the challenge of dealing with radioactive waste. They also point out that nuclear plants can accidentally release hot water into rivers and lakes, which can change the environment for plants and animals living there. Critics believe that even with new technology, nuclear power remains very risky and expensive. They also say that building nuclear plants often costs more than expected and that managing the waste is very complicated.

On 1 August 2020, the UAE started the Arab region's first nuclear energy plant. The first unit of the Barakah plant in Abu Dhabi began producing heat, with three more units being built. Some experts warn that this investment could create risks in the Gulf region, harm the environment, and increase the chance of nuclear weapons spreading.

Environmental impact

Main article: Environmental impact of nuclear power

Nuclear power plants do not create gases that warm the planet when they are running. Older plants create very little carbon dioxide over their whole life, about the same as wind power and much less than solar, natural gas, or coal power. Newer plants create even less.

However, nuclear power plants can affect the environment in other ways. They create waste that stays radioactive, and they can release heat into rivers or lakes, which can harm fish and other water life. Mining the materials used in nuclear power, like uranium, can also harm the environment near the mining sites. Even though burying nuclear waste deep underground is considered safe, accidents while moving the waste can sometimes let harmful materials leak out.

Big nuclear accidents, like the ones at Chernobyl and Fukushima, release large amounts of radioactive material into the environment, which can harm plants, animals, and people. To prevent this, better rules and training are used, and special areas where people cannot live are created to keep everyone safe.

Future development

Ongoing projects

As of March 2024, about 60 nuclear reactors for power plants are being built around the world, with a total capacity of 64 GW, and 110 more are in the planning stages. Most of these reactors are in Asia. In recent years, the opening of new reactors has been about the same as the closing of older ones. Over the past two decades, 100 reactors started working, while 107 were closed.

Next generation nuclear power plant

Main article: Generation IV reactor

A group of countries is working together to study and develop six new types of nuclear reactors. This group, called the Generation IV International Forum (GIF), started in 2000 and includes countries such as Argentina, Brazil, Canada, France, Japan, South Korea, South Africa, the UK, and the USA. New members include Switzerland, China, Russia, Australia, and the European Union. The group shares ideas and research but does not build reactors. They aim to create rules for these new reactor technologies.

In 2002, GIF chose six reactor designs after studying about 100 ideas. Three of these designs are fast neutron reactors, which work at higher temperatures than current reactors. These new reactors are meant to be more sustainable, cheaper, safe, and reliable. Four designs have been tested, and more research is planned before they can be used commercially before 2030.

The world's first nuclear power plant using Gen IV reactors is the Shidao Bay Nuclear Power Plant. This plant uses a high-temperature gas-cooled reactor. Building started on September 21, 2014, it began making power on December 20, 2021, and started full commercial operation on December 12, 2023.

Fusion power plant

Main article: Fusion power

Another area of development for nuclear power plants is nuclear fusion. Research on nuclear fusion and plasma physics has advanced, with over 50 countries involved. Recently, scientists achieved the first scientific energy gain in a fusion experiment. Different designs are being tested, including machines using magnets, lasers, and other methods. The success of fusion energy depends on global teamwork, industry growth, and building the needed infrastructure.

Construction of ITER, the largest international fusion facility, began in 2020 in France. Experiments will start later this decade, with full-power tests planned for 2036. ITER aims to help create DEMO power plants, which experts think could start operating by 2050. Private companies are also using public research to advance fusion technology, which might lead to commercial fusion power even before the mid-21st century. Countries involved in ITER are also developing their own fusion reactor models. In China, researchers are working on a new reactor called the China Fusion Engineering Test Reactor (CFETR), aiming to build a practical commercial fusion power plant by 2050.