How close is nuclear fusion power?

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1. 1

   Fusion power (Wikipedia)

   WikipediaPublished Oct 1, 2026Checked Oct 4, 2026

   “Fusion power is a potential method of electric power generation from heat released by nuclear fusion reactions. In fusion, two light atomic nuclei combine to form a heavier nucleus and release energy. Devices that use this process are known as fusion reactors. Research on fusion reactors began in the 1940s. As of 2025, the National Ignition Facility (NIF) in the United States is the only laboratory to have demonstrated a fusion energy gain factor above one, but efficiencies orders of magnitude higher are required to reach engineering breakeven (a net electricity-producing plant) or economic breakeven (where the net electricity pays for the plant's whole-life cost). Thermonuclear fusion reactions require fuel in a plasma state and a confined environment with high temperature, pressure, and sufficient confinement time. The relationship between these parameters is expressed by the Lawson criterion. In stars, gravity provides the conditions for fusing hydrogen isotopes. Experimental reactors use deuterium and tritium, heavier isotopes of hydrogen, in a process known as DT fusion. This reaction forms a helium nucleus and an energetic neutron.”

2. 2

   Nuclear Fusion Power Plants

   IntechOpen eBooks (Takeda & Pearson)Published Feb 6, 2019Checked Sep 30, 2026

   “The promise of nuclear fusion to provide clean and safe energy, while having abundant fuel resources continues to drive global research and development. However, the goal of reaching so-called “breakeven” energy conditions, whereby the energy produced from a fusion reaction is greater than the energy put in, is yet to be demonstrated. It is the role of ITER, an international collaborative experimental reactor, to achieve breakeven conditions and to demonstrate technologies that will allow fusion to be realized as a viable energy source. However, with significant delays and cost overruns to ITER, there has been increased interest in the development of other fusion reactor concepts, particularly by private-sector start-ups, all of which are exploring the possibility of an accelerated route to fusion. This chapter gives a comprehensive overview of nuclear fusion science, and provides an account of current approaches and their progress towards the realization of future fusion energy power plants. The range of technical issues, associated technology development challenges and future commercial opportunities are explored, with a focus on magnetic confinement approaches.”

3. 3

   Overview of the present progress and activities on the CFETR

   Nuclear Fusion (Wan et al.)Published Jun 23, 2017Checked Sep 30, 2026

   “The China Fusion Engineering Test Reactor (CFETR) is the next device in the roadmap for the realization of fusion energy in China, which aims to bridge the gaps between the fusion experimental reactor ITER and the demonstration reactor (DEMO). CFETR will be operated in two phases. Steady-state operation and self-sufficiency will be the two key issues for Phase I with a modest fusion power of up to 200 MW. Phase II aims for DEMO validation with a fusion power over 1 GW. Advanced H-mode physics, high magnetic fields up to 7 T, high frequency electron cyclotron resonance heating and lower hybrid current drive together with off-axis negative-ion neutral beam injection will be developed for achieving steady-state advanced operation. The recent detailed design, research and development (R&D) activities including integrated modeling of operation scenarios, high field magnet, material, tritium plant, remote handling and future plans are introduced in this paper.”

4. 4

   The Spherical Tokamak for Energy Production (STEP) in context: UK public sector approach to fusion energy.

   Philosophical transactions. Series A, Mathematical, physical, and engineering sciences (Baker)Published Aug 26, 2024Checked Oct 4, 2026

   “The UK's fusion energy approach has developed over the past 5 years to include government policy initiatives and a range of public sector investments designed to be delivered in partnership with the private sector. These have aimed to create an environment that stimulates innovation and investment to deliver economic as well as scientific and environmental benefits throughout the lifetime of the public sector fusion energy programme. The Spherical Tokamak for Energy Production acts as a focus and anchor for both public and private sector efforts to develop fusion energy, developing the supply chain and potential for Intellectual Property development and export opportunities well ahead of the anticipated STEP completion date of 2040. This is maximized by the UK's approach to a holistic research and innovation programme backed up by a regulatory and skills programme. This article is part of the theme issue 'Delivering Fusion Energy - The Spherical Tokamak for Energy Production (STEP)'.”

5. 5

   Superconductors for fusion: a roadmap

   Superconductor Science and Technology (Mitchell et al.)Published Jun 9, 2021Checked Sep 30, 2026

   “With the first tokamak designed for full nuclear operation now well into final assembly (ITER), and a major new research tokamak starting commissioning (JT60SA), nuclear fusion is becoming a mainstream potential energy source for the future. A critical part of the viability of magnetic confinement for fusion is superconductor technology. The experience gained and lessons learned in the application of this technology to ITER and JT60SA, together with new and improved superconducting materials, is opening multiple routes to commercial fusion reactors. The objective of this roadmap is, through a series of short articles, to outline some of these routes and the materials/technologies that go with them.”

6. 6

   A data-driven modeling of public acceptance for fusion energy: analyzing public perceptions through future-centric empirical segmenting framework.

   Scientific reports (Lee et al.)Published Aug 11, 2026Checked Oct 4, 2026

   “Drawing on "Future Orientation Theory", we designed an exploratory profiling framework that categorizes public attitudes based on three axes: social direction, vision feasibility, and participation intent. A comprehensive survey of 1,000 South Koreans was analyzed using this integrated segmenting framework to identify eight distinct conceptual profiles, which were then empirically mapped onto three data-driven clusters. The analysis reveals that "Strategist" and "Visionary" groups demonstrate significantly higher acceptance rates (over 80%) compared to "Skeptic" group (approximately 37%). Furthermore, a strong correlation exists between understanding of advanced technology and positive fusion perception, suggesting that acceptance is significantly associated with active attitude toward future social changes. Finally, we propose an "Intelligent Engagement Roadmap" that provides optimized communication strategies for each profile. This study demonstrates that integrating social-perception data into the engineering design process is essential for the sustainable implementation of fusion energy systems.”

7. 7

   Nuclear fusion (Wikipedia)

   WikipediaPublished Sep 30, 2026Checked Sep 30, 2026

   “Nuclear fusion is a reaction in which two or more atomic nuclei combine to form a larger nucleus. The difference in mass between the reactants and products is manifested as either the release or the absorption of energy. This difference in mass arises as a result of the difference in nuclear binding energy between the atomic nuclei before and after the fusion reaction. Active stellar cores are powered by fusion. Nucleosynthesis via fusion, in the Big Bang and in stars, creates all elements lighter than nickel (atomic number 28). Fusion typically occurs via thermonuclear fusion, an isotropic process requiring a triple product of very high temperature (in the kiloelectronvolt or hundred million Kelvin range), density, and confinement time. These conditions occur only in, thermonuclear weapons and boosted fission weapons, and fusion power experiments. A nuclear fusion process that produces atomic nuclei lighter than nickel-62 is generally exothermic, due to the positive gradient of the nuclear binding energy curve. The most fusible nuclei are among the lightest, especially deuterium, tritium, and helium-3.”

8. 8

   Progress in the ITER Physics Basis

   Nuclear Fusion (Ikeda)Published Jun 1, 2007Checked Sep 30, 2026

   “Ivanov (Kurchatov Institute, Russia) Y. Kamada (Japan Atomic Energy Agency, Naka, Japan) P.K. Kaw (Institute for Plasma Research, India) S. Konovalov (Kurchatov Institute, Russia) M. Kwon (National Fusion Research Center, Korea) J. Li (Academy of Science, Institute of Plasma Physics, China) S. Mirnov (TRINITI, Russia) Y. Nakamura (National Institute for Fusion Studies, Japan) H. Ninomiya (Japan Atomic Energy Agency, Naka, Japan) E. Oktay (Department of Energy, USA) J. Pamela (European Fusion Development Agreement—Close Support Unit) C. Pan (Southwestern Institute of Physics, China) F. Romanelli (Ente per le Nuove tecnologie, l'Energia e l'Ambiente, Italy and European Fusion Development Agreement—Close Support Unit) N. Sauthoff (Princeton Plasma Physics Laboratory, USA and Oak Ridge National Laboratories, USA) Y. Saxena (Institute for Plasma Research, India) Y. Shimomura (ITER Organization) R. Singh (Institute for Plasma Research, India) S. Takamura (Nagoya University, Japan) K. Toi (National Institute for Fusion Studies, Japan) M. Wakatani (Kyoto University, Japan (deceased)) H. Zohm (Max-Planck-Institut für Plasmaphysik, Garching, Germany)”