Fusion Energy
Fusion is a potential energy source and occurs when one or more lighter elements combine to form a heavier element, releasing energy in the process.
Fusion Energy
Fusion is a potential energy source and occurs when one or more lighter elements combine to form a heavier element, releasing energy in the process. [1] Devices designed to harness this energy are known as fusion reactors. [2] A future fusion plant could use the heat produced by the fusion reaction to produce steam to drive turbines or generators that produce electricity. [3] For almost a century, scientists around the globe have been looking to recreate and harness the power of fusion energy. [4]
Tokamak
Source: ITER
There are two commonly pursued technologies to create and control plasma. Magnetic confinement uses strong magnets to contain plasma. A widely used configuration known as a tokamak[5] uses powerful magnets to confine the plasma within a toroidal reaction vessel, with the magnetic fields keeping the plasma away from the walls of the vessel to prevent damage and unintended cooling of the plasma.[6]
Examples of U.S. companies developing magnetic confinement systems are Commonwealth Fusion Systems, TAE Technologies, Tokamak Energy, Helion Energy, and Thea Energy. Inertial confinement uses high-power lasers or electrical discharges to compress a small capsule of fusion fuel to extreme temperatures and pressures for a short time. This approach is used, for example, in the National Ignition Facility at the U.S. Department of Energy (DOE) Lawrence Livermore National Laboratory. [7] Examples of U.S. companies developing inertial confinement systems are Xcimer Energy, Focused Energy, ZAP Energy, and Shine Technologies. In addition to these methods, several companies such as General Fusion, are pursuing various other pathways to try to create and control fusion reactions, including a hybrid of both magnetic and inertial confinement approaches. [8]
Various fusion fuels are used to power these pursued pathways. According to the U.S. Department of Energy, once developed, first-generation fusion plants may likely use a combination of abundant deuterium and lithium as fuel. [9] Deuterium, lithium and tritium Deuterium-tritium is a highly studied fusion fuel and a likely basis for the first fusion power plants.[10] Lithium is a critical resource for fusion because of its material properties. Lithium is used to breed tritium, the key fuel for fusion. [11] The rare lithium-6 form of the metal, which makes up only 7.5 per cent of all naturally occurring lithium, is the most efficient for sustaining the fusion process. [12] Li-6 is banned in the U.S. because of the harmful mercury waste it generates. [13] So most fusion power concepts rely on “enriched” lithium, where the Li-6 content has been boosted. [14]
Several companies are investing in efforts aimed at commercializing fusion energy. [15] Many of these companies are startups that have raised over $100 million in the past few years. [16] The global fusion energy market size is projected to reach $611.8 billion by 2034, expanding at a CAGR of 5.56% from 2025 to 2034. [17]
Current State - Projections of the time to putting Fusion Energy on the Grid
As of October 2025, fusion reactors remain pre-commercial, with no system yet producing net energy. Fusion energy stakeholders provide varying timelines as to when fusion energy will become technically feasible as an energy source for the electrical grid and when it will become commercially viable. Projections range from 10 years to several decades in the future. [18] Some companies are claiming that they will achieve commercial fusion energy in the next few years[19] while other stakeholders and experts said fusion energy will take more than 20 years. The Fusion Industry Association reported that many commercial companies predict fusion industry will be commercially viable in the 2030’s time frame. [19]
Other stakeholders and experts believe fusion energy might put electricity on the grid in 10 to 20 years, however, significant resources are required to do so.[20] The Figure below illustrates commercialization risks that fusion energy will face on the road to commercial deployment. According to the U.S. Department of Energy, the aspirational timeline as shown is strongly dependent on the level of both public and private investments. [21]
Source: The Global Fusion Industry in 2025—Fusion Industry Association
Commercialization risks for fusion
Source. U.S. Department of Energy, Fusion Energy Strategy 2024
Key Challenges
Claims of commercially viable fusion power being relatively imminent. Several companies have announced plans to build grid-scale commercial nuclear fusion power plants intended to come online in the early 2030s, according to the “The global fusion industry in 2025.”
Source. The Global Fusion Industry in 2024—Fusion Industry Association
However, several challenges must be overcome to achieve commercial fusion energy. For instance, harnessing fusion energy still faces challenges such as physics of a plasma in combustion, heat extraction, manufacturing of sophisticated components such as the blanket, effect of 14-MeV neutrons on material. [1] below are some of the challenges facing commercialization of fusion energy technology up to 2030 identified in Fusion Industry Association’s The Global Fusion Industry in 2024 report.
Additional challenges are discussed in a 2023 technology assessment by the Government Accountability Office. [2] For instance,
“One key scientific challenge is in the physics of plasmas; the state of matter needed for fusion. Researchers do not fully understand the behavior of burning plasmas, those whose main source of heat is from the fusion reaction itself rather than an external source. Researchers have made advancements in this area but lack sufficient experimental data to validate their simulations. One key engineering challenge is the development of materials that can withstand fusion conditions for decades, such as extreme heat and neutron damage, and no facility exists where materials can be fully tested. More generally, the task of extracting energy from fusion to provide an economical source of electric power presents several complex systems engineering problems that have yet to be solved.”
A long-recognized drawback of fusion energy is neutron radiation damage to exposed materials, causing swelling, embrittlement and fatigue. [3] Plasma-facing components are materials and structures located at the inner walls of a fusion reactor, directly exposed to a large amount of heat energy transferred to a surface in a short period of time (high heat flux), energetic plasma and intense neutron irradiation. Notably, no existing material can simultaneously withstand all these extreme conditions for long-term operations. The commercial viability of fusion energy depends on developing plasma-facing components capable of enduring these harsh environments. [4]
Knowledge Hub
In 2024, the U.S. Department of Energy (DOE) Office of Science released its fusion energy vision, “Building Bridges: A Vision For The Office of Fusion Energy Sciences,” which identified three strategic actions to help bridge the interests of the private fusion energy sector and the public programs supported by the Office of Science: creating a U.S. Fusion Science & Technology Roadmap; establishing Fusion Innovation Research Engine Ecosystems; and developing a public-private consortium framework supporting fusion energy development.
In June 2024, the Office of Science released the “Fusion Energy Strategy 2024,” outlining its vision for the future of the Fusion Energy Sciences program. The strategy report organized DOE’s fusion energy goals into three high-level objectives: (1) closing science and technology gaps to a commercially relevant fusion pilot plant; (2) preparing the path to sustainable, equitable commercial fusion energy deployment; and (3) building and leveraging external partnerships. DOE is also developing a National Fusion Science and Technology Roadmap, to be released in the future, which focuses on closure of science and technology gaps to commercially relevant fusion pilot plants.
Other fusion energy Policy studies include the long-range plan issued in 2020 by DOE’s Fusion Energy Sciences Advisory Committee, titled “Powering the Future: Fusion and Plasmas”; a 2021 study by the National Academies of Sciences, Engineering, and Medicine, titled “Bringing Fusion to the U.S. Grid”; and a 2023 technology assessment by the Government Accountability Office, titled, “Fusion Energy: Potentially Transformative Technology Still Faces Fundamental Challenges.”
Conferences
August 2-5, 2026, Seattle, WA.
Organized by NEI, this national conference will cover topics such as licensing and regulatory reform to next-gen fuel, inclusion, and workforce development. This is a members-only event.
August 16-20, 2026, Chicago, IL
Global, organized by American Nuclear Society, is a series of international conferences that cover all facets of nuclear technology. The theme in 2026 is “Deploying Sustainable Nuclear Fuel Cycles.”
Nuclear Energy Conference & Expo (NECX)
August 24-27, 2026, Dallas, TX.
NECX attracts over 1,000 professionals from the nuclear energy ecosystem, offering a technology expo and various networking opportunities.
4th World Nuclear SMR & Advanced Reactor Congress 2026
September 29-30, 2026, Nashville, TN
Considered the “intelligence hub for the SMR and advanced reactor industry,” this event features more than 60 expert speakers and attracts over 500 attendees and over 300 companies.
May 11-12, 2027, Austin, TX
This event attracts over 750 attendees across the entire supply chain of the new nuclear industry with the goal of building new partnerships.
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