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The History of Nuclear Power: The Big Picture

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The History of Nuclear Power: The Big Picture

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Grace Cabrera
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Nuclear power produces little to no carbon dioxide (CO2) emissions or other greenhouse gasses (GHGs). Despite facing criticism for its use of radioactive materials to generate electricity, nuclear power has evolved into our second-largest source of low-carbon energy today. So, we had to ask: What is the history of nuclear power?

Nuclear power began in the 1930s with the experimental and theoretical validation of nuclear reactions. Then, the first nuclear power plant was constructed in 1954. The post-World War II era saw rapid development and led to nuclear becoming our second-largest source of low-carbon energy today. 

One way to combat the current global climate crisis threatening Earth’s environmental, economic, and social health is to transition away from traditional fossil fuels and toward cleaner energy sources, such as nuclear power. Keep reading to learn how nuclear power came to be, who and what pioneered its development, how effective it has been thus far, and what the future of nuclear power could entail.

Here’s the History of Nuclear Power in a Nutshell

In general, nuclear power is generated when neutrons either divide or fuse, which releases heat, produces steam, spins a turbine, and drives generators to produce electricity. These two ways we can generate nuclear power are via nuclear fission (when neutrons divide) or nuclear fusion (when neutrons fuse).

This means that the history of nuclear power is the history of both nuclear fission and nuclear fusion.

Nuclear fission is the generation of energy produced when splitting apart the nucleus of an atom. 

“Nuclear fission: a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.”

Cambridge Dictionary

Nuclear fusion is the generation of energy produced when lighter atoms are combined or fused to create larger and heavier atoms.

“Nuclear fusion: the process of joining two nuclei to produce energy.”

Cambridge Dictionary

All operating nuclear power plants today utilize the process of nuclear fission, whereas nuclear fusion is still very much in the research and development phase. 

Nuclear fission has gone through three distinct development phases in its development:

  • Early market formation and innovation: The early history of nuclear power dates back to the late 1800s, with studies about the science of atomic radiation, the atomic model, and the naturally-occurring fission and fusion processes. 
  • Consolidation and strengthening: The first laboratory experiments and the validation of nuclear processes kickstarted the nuclear power movement, which saw rapid capacity and technology growth from 1950-2000.
Nuclear Power MilestonesHistorical Event
Initial startThe early history of nuclear power dates back to the late 1800s, with studies about the science of atomic radiation, the atomic model, and the naturally-occurring fission and fusion processes. 
Milestones in nuclear power development1929: Arthur Eddington first articulated the idea of nuclear fusion.
1934: Enrico Fermi unknowingly directed the first controlled chain reaction involving nuclear fission. Mark Oliphant demonstrated nuclear fusion in a laboratory setting and discovered helium-3 and tritium.
1938: Otto Hahn and Fritz Straßmann experimentally proved the process of nuclear fission. 
1938: Lise Meitner and Otto Frisch theoretically proved the process of nuclear fission.
1939: Otto Frisch and William Arnold coined the term “fission”. Hans Bethe and Subrahmanyan Chandrasekhar figured out the precise subatomic process of fusion.
1939-1945: Nuclear development was focused on the making of the atomic bomb during World War II. 
1950s: Andrei Sakharov and Igor Tamm conceptualized the tokamak, which would become the preferred nuclear fusion reactor today.
1951: Lyman Spitzer invented the stellarator, another type of fusion reactor.
1956: Calder Hall, the world’s first commercial nuclear fission power station, became operational.
1958: The Atoms for Peace conference opened the door to researching nuclear fusion for energy purposes. 
1958: The world’s first tokamak fusion reactor, the T-1, was constructed in Russia. 
1960-2000: Nuclear power generation increases from 25 TWh to over 2,500 TWh.
1983: The Joint European Torus (JET) tokamak was constructed, the largest operational nuclear fusion reactor to achieve nuclear fusion at the time.
1991: JET achieved the world’s first controlled release of fusion power.
2000-present: Nuclear power generation has remained relatively stable. Research into the process of nuclear fusion has increased. 
2006: The International Thermonuclear Experimental Reactor (ITER) agreement was signed.
2021: The world record fusion power, 59 megajoules of energy, was achieved in The Joint European Torus (JET) tokamak fusion reactor.
2022: The National Ignition Facility at Lawrence Livermore National Laboratory in California (US) demonstrated the viability of nuclear fusion energy for the first time.
2023: The Joint European Torus (JET) tokamak began the decommissioning process.
2023: The National Ignition Facility at Lawrence Livermore National Laboratory replicated the ignition process three more times.
2024: German startup Proxima Fusion revealed an open-source design for the world’s first, commercial nuclear fusion plant based on the Stellarator model.
2025: The WEST tokamak set a new record by maintaining a hot fusion plasma for 22 minutes at a temperature of 50 million °C (122 million °F).
2025: The EAST tokamak set a new record by maintaining a steady fusion reaction for 1,066 seconds.
Current statusCurrently, nuclear power accounts for roughly 9% of global electricity generation in 2023, generating 2,685 TWh of electricity from 440 power reactors with over 400 GW of installed capacity.
Future outlookThe future of nuclear power faces an uncertain future. Although it can produce relatively emissions-free energy and adjust its energy output to compensate for shifts in renewable energy output, it also faces high upfront costs, technological barriers, and negative public opinion. 
Key policy developments1957: International Atomic Energy Agency (IAEA)
1974: International Energy Agency (IEA)
1994: Nuclear Energy Institute (NEI)
1998: World Nuclear Transport Institute (WNTI)
2001: World Nuclear Association (WNA)
2006: The International Thermonuclear Experimental Reactor (ITER) Agreement and ITER Project
2015: Paris Climate Agreement
2018: The Fusion Industry Association (FIA)

Understanding nuclear power’s history can provide insight into how it has evolved into the energy source it is today.

When and How Did Nuclear Power Get Started

Radioactivity has always been present on Earth, but it wasn’t seriously studied until the late 1800s. The early history of nuclear power involved studies about the science of atomic radiation, the atomic model, and the fission and fusion processes.

1789: German chemist Martin Klaproth discovered the element Uranium, which would become the foundation of modern nuclear fission.

1896: French physicist Henri Becquerel discovered the concept of radioactivity, the release of energy from atomic nuclei. His studies focused specifically on Uranium.

1897: British physicist J.J. Thompson discovered the electron, (he also received the Nobel Prize in Physics in 1906 for this discovery).

1911: New Zealand physicist Ernest Rutherford articulated his concept of the atom called “the Rutherford model”. It depicted a dense, positively-charged core called the nucleus surrounded by circulating, negatively-charged particles called electrons. This was the first primitive model of the atom.

1913: English chemist Frederick Soddy coined the term “isotope” to refer to chemically identical atoms with different atomic weights. Isotopes would become key in the formation of the modern nuclear industry.

1919: Danish physicist Niels Bohr articulated his concept of the atom called “the Bohr model”. His model was similar to Rutherford’s, but Bohr’s model depicted electrons that were confined to particular orbits, with electromagnetic radiation from an atom only occurring when electrons jumped to a lower-energy orbit. This was the first modern model of the atom.

1920: British astrophysicist Arthur Eddington theorized that stars get their energy from the fusion of hydrogen into helium. His theory laid the foundation of modern theoretical astrophysics.

1929: British and Dutch physicists Robert d’Escourt Atkinson and Fritz Houtermans suggested that fusing nuclei together could produce large amounts of energy. They also calculated the rate of nuclear fusion in stars.

1932: James Chadwick discovered the neutron, the part of the atom that is split apart during the process of nuclear fission. This led to the discovery that due to a differing number of neutrons, elements can exist at different weights but still have the same chemical properties.

How Has Nuclear Power Developed Over Time

Nuclear fission is currently our second-largest source of low-carbon energy behind hydropower energy. Pending further research and development, nuclear fusion could also play an important role in the global energy transformation.

What Are Milestones in Nuclear Power Development 

The accidental creation of the first man-made nuclear chain reaction and the first laboratory experiment demonstrating nuclear fusion kickstarted the nuclear power movement, which saw rapid growth beginning in the 1950s. 

1934: Italian physicist Enrico Fermi unknowingly directed the first controlled chain reaction involving nuclear fission. He bombarded more than 60 elements, one of which was Uranium, with neutrons. He thought he had produced elements beyond Uranium when he had actually split apart the atom.

1934: Ernest Rutherford fused deuterium into helium and observed an “enormous effect”, a release of energy. This would pave the way for modern nuclear fusion research. 

1934: Australian physicist Mark Oliphant became the first to demonstrate nuclear fusion in a laboratory setting. He also discovered helium-3 and tritium, both of which are used in nuclear fusion, and the fusion reaction which formed the basis for a hydrogen bomb.

1938: German radiochemists Otto Hahn and Fritz Straßmann experimentally proved the process of nuclear fission. Bombarding Uranium with neutrons produced barium, which was deemed too light to be just a decay product of Uranium. They hypothesized that the Uranium atom had been split into two distinct atoms. This discovery would shape the modern nuclear industry.

1938: Austrian physicists Lise Meitner and Otto Frisch theoretically proved the process of nuclear fission, the splitting of the Uranium atom, which was carried out experimentally by Hahn and Fritz.

1939: Otto Frisch and William Arnold coined the term “fission” to refer to the splitting of an atomic nucleus.

1939: German and Indian physicists Hans Bethe and Subrahmanyan Chandrasekhar demonstrated that stars are fueled by nuclear fusion. They identified the “proton-proton chain”, which is the process that enables stars to generate energy and the model for modern fusion.

1939-1945: Most nuclear development was focused on the making of the atomic bomb during World War II. 

1950s: Soviet scientists Andrei Sakharov and Igor Tamm conceptualized the tokamak, which, like the stellarator, used magnetic fields to control plasma particles and maintain the right conditions for fusion reactions to occur. Tokamaks are the preferred option today for nuclear fusion energy power plants because they are easier to build than stellarators and are better at keeping plasmas hot.

1951: Lyman Spitzer invented the stellarator, a machine that uses magnetic fields to control plasma particles and maintain the right conditions for fusion reactions to occur. This was the first model for harnessing fusion reactions. 

1956: Calder Hall, the world’s first commercial nuclear power station, became operational in the United Kingdom. It had a 49 MW capacity and remained operational for 47 years before closing in 2003.

1958: Nuclear fusion research was declassified at the Atoms for Peace conference in Geneva, which opened the door to researching fusion for energy purposes. Previously, nuclear fusion research was linked only to atomic weapons development. 

1958: The world’s first tokamak fusion reactor, the T-1, was constructed in Russia. 

1960-2000: Nuclear power generation increased from 25 TWh to over 2,500 TWh as more and more power stations were constructed worldwide.

1983: The Joint European Torus (JET), the largest operational nuclear fusion reactor to achieve nuclear fusion at the time, was constructed.

1991: JET achieved the world’s first controlled release of fusion power. Previously, fusion reactions had only taken place uncontrollably via hydrogen bombs.

2000-present: Nuclear power generation has remained relatively stable. Research into the process of nuclear fusion, the other way to generate nuclear power, has increased. 

2006: The International Thermonuclear Experimental Reactor (ITER) agreement was signed, and the ITER project was formed. ITER is both an international cooperation between 35 countries and the name of what will be the world’s largest and most advanced tokamak reactor.

2021: The world record fusion power was achieved in The Joint European Torus (JET) tokamak. JET produced 59 megajoules of energy, double the previous record amount. It was also the first reactor to run off of a 50-50 mix of tritium and deuterium.

2022: The National Ignition Facility at Lawrence Livermore National Laboratory in California (US) demonstrated the viability of nuclear fusion energy for the first time ever when a fusion reaction produced more energy than was needed to spark the reaction. The machine’s laser fired 2 megajoules onto a target and produced 3 megajoules of energy.

2023: The Joint European Torus (JET) tokamak began the decommissioning process, ending 40 years of history making experiments.

2023: The National Ignition Facility at Lawrence Livermore National Laboratory replicated the ignition process three more times, further proving the viability of nuclear fusion.

2024: German startup Proxima Fusion revealed an open-source design for the world’s first, commercial nuclear fusion plant based on the Stellarator model. The model is slated to be complete by 2027, the pilot plant (Alpha) by 2031, and commercialization sometime in the 2030s. 

2025: The WEST tokamak, a fusion research device located in France, set a new record by maintaining a hot fusion plasma for 22 minutes at a temperature of 50 million °C (122 million °F). Keeping plasma stable is necessary to make fusion a viable, long-term energy source.

2025: The EAST tokamak, a fusion research device located in China, set a new record by maintaining a steady fusion reaction for 1,066 seconds (17.7 minutes).

How Has the Nuclear Power Market Developed Recently

Beginning in 1950, both the nuclear fission and nuclear fusion industries saw rapid growth. In more recent years, nuclear fission has seen a relatively stable market, with slight decreases in installed capacity and electricity output. 

Nuclear fusion, on the other hand, is still in the research and development stage and currently does not currently supply energy to the power grid. In terms of recent breakthroughs:

  • In 2023, The National Ignition Facility at Lawrence Livermore National Laboratory built upon their 2022 breakthrough by replicating the ignition process three more times, creating more energy from the reaction than was used to initiate the reaction. 

What Is the Present Status of Nuclear Power

Nuclear energy accounted for roughly 9% of global electricity generation in 2023, generating 2,685 TWh of electricity from 440 power reactors with over 400 GW of installed capacity.

Illustration of Nuclear power generation from Our World in Data
Our World in Data: Nuclear power generation

Nuclear energy provides 25% of the world’s low-carbon electricity, making it our second-largest source. Some countries rely heavily on nuclear energy whilst others have not yet tapped into the resource. For example, nuclear provides roughly 70% of France’s and 50% of Ukraine, Slovakia and Hungary’s electricity, but South America and Africa get virtually no energy from nuclear.

Illustration of Share of primary energy consumption from nuclear, 2023 from Our World in Data
Our World in Data: Nuclear power generation, 2023

For nuclear fusion, there are currently more than 10 stellarators and 50 tokamaks in operation worldwide, but there are currently no operating reactors that provide energy to our power grid. 

As part of The International Thermonuclear Experimental Reactor (ITER) agreement, the world’s largest tokamak, also named ITER, is currently being built in France. Weighing 23,00 tons, the machine will be able to maintain a temperature 10x that of the sun’s core and will have a 500 MW fusion energy output power once constructed. Although it will not be used to generate electricity, the technology of ITER will set the standard for future reactors.

How Will the Future of Nuclear Power Look Like

Nuclear fission is predicted to continue to play a key role in the clean energy movement for years to come because it can produce relatively emissions-free energy and adjust its energy output to compensate for shifts in renewable energy output despite facing high upfront costs and negative public opinion.

Nuclear fusion offers the prospect of an inexhaustible energy source for future generations, but it has been held back thus far by unresolved engineering challenges. Achieving nuclear fusion energy commercialization will require increased funding and research.

How Nuclear Power Will Likely Develop in the Future

Overall, the IEA has labeled nuclear power as ‘more efforts needed’ in their Net Zero by 2050 Scenario in terms of capacity and investments. 

In terms of capacity additions, nuclear power capacity must increase from 414 GW to 545 GW by 2030 to stay on track in the net zero scenario. Currently, there are about 60 nuclear fission reactors under construction in 15 countries, most notably in China, India, and Russia.

Illustration from International Energy Agency: Nuclear power capacity by country or region in the Net Zero Scenario, 1990-2030
International Energy Agency: Nuclear power capacity by country or region in the Net Zero Scenario, 1990-2030

In terms of funding, nuclear power investment must triple to $125 billion per year to stay on track in the net zero scenario. Investment averaged only $40 billion per year from 2016-2022, but the Intergovernmental Panel on Climate Change (IPCC) predicts global investments to increase to over $100 billion per year through 2050.

Illustration from International Energy Agency: Average annual investment in nuclear power by country or region in the Net Zero Scenario, 2011-2030
International Energy Agency: Average annual investment in nuclear power by country or region in the Net Zero Scenario, 2011-2030

Most experts agree that we are unlikely to achieve large-scale nuclear fusion energy generation before 2050. This means that fusion is not an option for meeting the short-term climate goals laid out in The Paris Climate Agreement, which aims to limit global warming to below 2 degrees Celsius (C).

But that doesn’t mean we should give up on nuclear fusion. Nuclear fusion can become a commercially viable energy source if we develop a steady and reliable way of maintaining the fusion reaction. 

In order to achieve commercial energy generation, we must overcome the two main challenges to nuclear fusion: maintaining the reaction and generating more energy from the reaction than was required to start the reaction. This will require increased funding and further technological advancements.

What Policies Are Put in Place to Support/Reduce Nuclear Power Usage

The most well-known piece of legally binding, international climate mitigation legislation is The Paris Agreement, the goal of which is to limit global warming to below 2 degrees Celsius (C), preferably to 1.5C, compared to pre-industrial levels. 

The Paris Agreement specifically notes a transition towards clean energies, such as nuclear power, as being a critical part of meeting these goals.

Check out the highlights of the 2015 COP21 directly from the UN Climate Change channel:

In addition, The International Energy Agency’s (IEA) Net Zero Emissions by 2050 Scenario is one framework for the global energy sector to achieve net zero CO2 emissions by 2050 and universal energy access by 2030.

There are many global nuclear power policies and organizations aimed at meeting the 2050 net zero scenario, including: 

  • 1957 – International Atomic Energy Agency (IAEA): The IAEA was founded as fears about nuclear technology began to develop. It is an organization within the United Nations that seeks to promote the safe, secure, and peaceful use of nuclear technologies through international cooperation.
  • 1974 – The International Energy Agency (IEA): The IEA was founded in response to the major oil disruptions in 1974. It promotes international energy cooperation, including nuclear power, and is made up of 31 member countries. 
  • 1994 – Nuclear Energy Institute (NEI): The NEI was founded as the policy organization of the nuclear power industry. They seek to promote the global growth of nuclear power through effective policies. 
  • 1998 – World Nuclear Transport Institute (WNTI): The WNTI was founded to represent the collective interests of the nuclear transport industry. They aim to ensure safety and security in the global transport of nuclear materials. 
  • 2006 – The ITER Agreement: ITER is a global scientific partnership established as a collaborative international project to develop fusion energy for peaceful purposes. Upon construction, the ITER tokamak will be the largest magnetic confinement fusion experiment in the world. 
  • 2018 – The Fusion Industry Association (FIA): The FIA was formed to be the voice of the private fusion industry. They are a nonprofit organization comprised of private companies striving to make nuclear fusion commercially viable.

If you are interested in learning more about country-specific nuclear power policies, you can visit the IEA’s nuclear power policy database.

What Are Currently the Different Types of Nuclear Power

In general, nuclear power is generated when neutrons either fuse or divide, which releases heat, produces steam, spins a turbine, and drives generators to produce electricity. The two ways we can generate nuclear power are via nuclear fission or nuclear fusion.

Related: Are you interested in learning more about nuclear power? Check it out in this article here: “Nuclear Power Explained: All You Need to Know”

Nuclear Fission Is How We Currently Produce Nuclear Power

Nuclear fission is the process by which neutrons are used to split the nucleus of an atom, which releases an enormous amount of energy in the form of heat and radiation. 

Illustration of the nuclear fission process
International Atomic Energy Agency: Nuclear Fission

Uranium-235 (U-235) is the isotope of Uranium used in nuclear fission because its atoms are easily split apart in nuclear reactors. Each time the reaction occurs, more neutrons are free to strike more and more nuclei, causing a chain reaction that turns a turbine and spins a generator to produce electricity. 

Related: Are you interested in learning more about nuclear fission? Check it out in this article here: “The History of Nuclear Fission: The Big Picture”

Nuclear Fusion Is Still in the Research and Development Phase

Nuclear fusion is the process by which lighter atoms are combined or fused to create larger and heavier atoms. The sun and stars get their energy from nuclear fusion, as hydrogen atoms fuse together to form helium and matter converts into energy. 

Illustration of the nuclear fusion process
International Atomic Energy Agency: Nuclear Fusion

Fusion reactions take place inside fusion reactors in plasma, a hot, charged gas made of positive ions and free-moving electrons. Deuterium and tritium, isotopes of hydrogen with extra neutrons, are the most commonly used nuclear fusion materials. 

The two most common fusion reactors in use today are tokamaks and stellarators. Both use magnetic fields to confine plasma in the shape of a donut.

  • Tokamaks: Induce electric currents inside of the plasma. Tokamaks are easier to build than stellarators and are better at keeping plasmas hot. They are the preferred option today for nuclear fusion energy power plants.
  • Stellarators: Use external coils to generate a twisting magnetic field. They require less injected power, have greater design flexibility, and are better at keeping plasma stable than tokamaks. However, they are also more complex to build.

Nuclear fusion is very hard to control within a laboratory setting; therefore, nuclear fusion is still very much in the research and development phase. More still needs to be done to determine if it could be another viable energy source.

Related: Are you interested in learning more about nuclear fusion? Check it out in this article here: “The History of Nuclear Fusion: The Big Picture”

Final Thoughts

The early history of nuclear fission and fusion dates back to the late 1800s, with studies about the science of atomic radiation, the atomic model, and the fission and fusion processes. When Enrico Fermi unknowingly directed the first man-made nuclear chain reaction and Mark Oliphant demonstrated nuclear fusion in a laboratory setting in 1934, it kickstarted the nuclear power movement. Once both processes were experimentally and theoretically verified, the industry saw rapid growth beginning in 1950.

Nuclear fission is currently our second-largest source of low-carbon energy behind hydropower energy. Nuclear fusion does not currently supply energy to our power grid, but the focus remains on refining the technology and increasing investments. The formation of the International Energy and World Nuclear Association plus the implementation of the Paris Climate Agreement Climate has propelled nuclear power into the spotlight as one replacement for traditional fossil fuels.

Nuclear power faces an uncertain future. Although nuclear fission can produce relatively emissions-free energy and adjust its energy output to compensate for shifts in renewable energy output, it also faces high upfront costs and negative public opinion. And most experts agree that we are unlikely to achieve large-scale nuclear fusion energy generation before 2050. Despite all of this, experts still predict that nuclear power, specifically nuclear fission, will play a key role in the clean energy movement for years to come.

Stay impactful,

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Grace Cabrera

Grace loves to research and write about all things related to climate action and sustainability. She holds a Bachelor’s degree in Environmental Biology and works as a Natural Resource Specialist. Outside of work, she loves to work out, play soccer, and take her dog for long walks.

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