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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFusion joins light atomic nuclei; fission splits heavy ones. Both can release energy as heat, which a power plant can use to make steam and turn a turbine. A future fusion plant would capture heat from fusion reactions in a blanket and coolant system, then convert it to electricity. ITER, a major fusion experiment, does not generate electricity for the grid.
How does fusion release energy?
Fusion happens when light atomic nuclei combine into a heavier nucleus. A leading reaction studied for energy is deuterium–tritium, or D-T, fusion: a deuterium nucleus and a tritium nucleus combine to produce a helium nucleus, also called an alpha particle, and a neutron. The products have slightly less mass than the starting nuclei; that difference is released as energy. The U.S. Department of Energy explains the reaction and its products in its overview of fusion reactions.
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In a magnetic-confinement device, the charged helium nucleus remains affected by the magnetic field and helps heat the plasma. The neutron has no electric charge, so the magnetic field cannot confine it. It leaves the plasma and transfers energy to surrounding structures as heat. ITER estimates that about 80% of the energy from a D-T reaction is carried away from the plasma by the neutron; that energy is deposited in surrounding structures as heat, according to ITER’s explanation of turning neutrons into electricity.
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How could a fusion plant turn that heat into electricity?
A future magnetic-confinement plant would need to capture reaction heat in a blanket surrounding the plasma and transfer it using a coolant. The heated coolant could then supply a heat engine, such as a steam cycle: steam spins a turbine connected to a generator. The nuclear reaction does not directly make electricity; the conversion depends on the same basic thermal-power principle used in many other power stations.
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ITER is testing prototype test blanket modules to study candidate blanket and coolant technologies. It is an experiment, not a power station: cooling water will carry heat away to cooling towers during its operations, rather than being used to produce grid electricity. ITER says plainly that it will not produce electricity, while the test modules will help investigate how a future plant might convert fusion power. See ITER’s explanation of what is needed to make fusion work.
How does fission work, and how is it different?
Fission splits a heavy atomic nucleus into smaller nuclei, often after a neutron strikes it. The process releases energy and additional neutrons; those neutrons can trigger further fissions in a controlled chain reaction. Uranium and plutonium are common reactor fuels, according to the U.S. Department of Energy’s comparison of fission and fusion.
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Commercial fission reactors use the heat from controlled fission to make steam, which drives a turbine and generator. So the fundamental difference is the nuclear change—joining light nuclei in fusion versus splitting heavy nuclei in fission—not the final electricity-making step. Both can use heat to power a turbine-based cycle.
| Question | Fusion | Fission |
|---|---|---|
| What happens to the nucleus? | Light nuclei combine into a heavier nucleus. | A heavy nucleus splits into smaller nuclei. |
| Example | D-T fusion produces a helium nucleus and a neutron. | Uranium or plutonium fission can release neutrons that sustain a chain reaction. |
| How can it generate electricity? | A future plant could collect heat in a blanket and coolant, then use a heat engine such as a steam turbine. | Operating reactors use fission heat to make steam for a turbine and generator. |
| Current electricity generation | ITER does not generate electricity; its blanket modules study technologies relevant to future plants. | Commercial reactors use controlled fission to produce heat and electricity. |
Does fusion make more energy than fission?
ITER’s 2023 article says controlled fusion releases about four times the energy of nuclear fission. That is ITER’s comparison of energy released by the nuclear reactions; it does not mean a commercial fusion plant currently produces four times the electricity of a fission plant. Reaction energy and the net electricity a complete facility exports are different measures. A plant must account for the electricity consumed to operate its systems as well as the efficiency of converting heat to electricity. ITER notes that future commercial designs must compare fusion output with total electrical input.
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Why is fusion electricity not yet a demonstrated commercial power source?
Producing fusion reactions is only one part of a power plant. The system must sustain the plasma, capture its heat, and operate components exposed to intense neutron radiation and high heat loads. ITER’s fusion FAQs describe outstanding challenges that include materials, heat exhaust, maintenance, tritium breeding and recycling, and efficient heat removal.
- Materials: Components surrounding the plasma must withstand neutron exposure and heat.
- Heat exhaust: The plant needs to remove intense heat without damaging the structures designed to capture it.
- Maintenance: Components inside the machine may need repair or replacement in a demanding radiation environment.
- Fuel cycle: A D-T plant would need reliable systems to breed, recover, and recycle tritium.
- Whole-plant efficiency: Generating fusion energy is not enough; a plant must convert enough of it to electricity to cover its own needs and deliver a net supply.
Fusion approaches do not all confine fuel in the same way. Magnetic confinement uses magnetic fields to hold plasma; inertial-confinement experiments compress and heat a target. The blanket-and-coolant explanation here describes a prospective magnetic-confinement plant, not every experimental approach. The Department of Energy outlines these approaches in its fusion energy overview. The cited sources identify continuing research and engineering work, not a definitive commercial deployment date.
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