Fusion’s Billion-Dollar Race Runs Into Commercial Reality

Private fusion companies are raising money at an unprecedented pace as tech giants seek clean, round-the-clock power. According to market research firm PitchBook, fusion startups raised $3.8 billion during the first eight months of this year, already surpassing the $3.3 billion raised by the entire industry during all of last year.

The Fusion Industry Association reports that the number of private fusion companies worldwide has doubled over the past five years, now exceeding 50. Startups are breaking ground on test facilities, signing power delivery contracts, and aiming to supply electricity to the grid by the end of this decade.

“`nn“`

Pacific Fusion recently broke ground on a new test facility in Albuquerque, New Mexico. Washington-state-based Helion Energy has announced plans to provide commercial electricity to Microsoft by 2028 under a power purchase agreement signed in May 2023.

That agreement requires Helion to deliver at least 50 megawatts of fusion-generated power within five years or face financial penalties. It is backed by hundreds of millions of dollars in venture funding, including significant personal investment from OpenAI CEO Sam Altman. Helion maintains that its 2028 commercial target is viable because it is built upon the iterative development of seven distinct prototypes.

Other startups are targeting commercial plant operations in the 2030s. Inertia Enterprises, which is working to commercialize fusion technologies originally developed at Lawrence Livermore National Laboratory, argues that the foundational scientific risks have already been resolved.

Jeff Lawson, chief executive of Inertia, said private companies are building on a massive foundation of taxpayer-funded science. “We don’t have to solve a physics problem,” Lawson said, pointing to the “60 years and $30 billion of investment” provided by the U.S. government.

The current wave of investment was highly catalyzed by a major scientific milestone in December 2022 at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory in California. Using an inertial confinement fusion process, researchers utilized 192 intense laser beams to compress a tiny fuel pellet of deuterium and tritium.

The experiment achieved net energy gain, or “scientific breakeven,” producing 3.15 megajoules of fusion energy from 2.05 megajoules of laser energy delivered to the target. The facility’s lasers, however, required roughly 422 megajoules of electricity from the local grid to generate those 2.05 megajoules of light energy.

The NIF experiment was not designed to operate as a commercial power plant. A commercial reactor must achieve “engineering breakeven,” meaning it must generate far more electricity than the entire facility’s systems consume.

This requirement is tied to the recirculation power fraction. Most proposed fusion reactor designs rely on the heat generated by the fusion reaction to boil water, create steam, and drive conventional turbines to make electricity. The plant itself would also require massive amounts of power to run cryogenic cooling systems, heat the fuel to extreme temperatures, and operate powerful magnetic confinement fields.

An analysis of a 2023 conceptual commercial plant design by Adam Jackson, a former systems engineer at General Fusion, revealed that the proposed facility would have to retain approximately 60% of its generated electricity just to run its own internal systems. Only 40% of the generated power would be available to send to the electrical grid, meaning a fusion plant would need to generate more than twice as much thermal electricity as a conventional fission or coal plant to deliver the same net output.

The reactors must create and confine hydrogen plasma at temperatures exceeding 100 million degrees Celsius, far hotter than the core of the sun. Materials inside the plasma chamber must also survive bombardment by highly energetic neutrons, which damage and degrade structural materials over time, making them brittle and radioactively contaminated.

Mohamed Abdou, professor emeritus of mechanical and aerospace engineering at the University of California, Los Angeles (UCLA), has cautioned that a single material failure or leak in the vacuum vessel could force a complete facility shutdown. Such a failure would require months of complex, robotic repair work.

Alain Bécoulet, chief scientist at ITER, the massive 34-nation experimental tokamak fusion project currently under construction in Cadarache, France, expects various test facilities to generate substantial fusion power over the next decade. He warned that these reactions will likely occur in brief, intermittent bursts, perhaps lasting no longer than 20 seconds at a time.

“There is no point. You cannot sell anything out of [an intermittent source],” Bécoulet told The Financial Times, noting that electrical grids require steady, predictable baseload power.

The fuel supply chain presents another unresolved bottleneck. Most near-term commercial fusion designs plan to use a fuel mixture of deuterium and tritium, two isotopes of hydrogen. Deuterium is abundant in water, but tritium is exceptionally rare in nature and has a half-life of only 12.3 years.

Global supplies of tritium are highly limited, produced primarily as a byproduct in CANDU heavy-water fission reactors in Canada and South Korea. A commercial fusion plant would have to breed its own tritium fuel to operate continuously.

That theoretical process involves surrounding the plasma chamber with a “breeding blanket” containing lithium. Neutrons emitted from the fusion reaction split the lithium atoms to produce tritium. Tritium breeding technology has only been demonstrated in small-scale laboratory experiments and has never been integrated into an operating power reactor.

Institutional researchers therefore maintain a far more conservative timeline than venture-backed startups. Steven Cowley, director of the Princeton Plasma Physics Laboratory—a U.S. Department of Energy national laboratory managed by Princeton University—expressed confidence that a pilot facility capable of producing net electricity could be online by the late 2030s.

Cowley emphasized that a pilot facility is not a commercial product. “I would like to keep that separation between commercial and pilot plants very clear in our mind,” Cowley said. He expects early pilot installations to serve as technology demonstration projects requiring about a decade of rigorous testing, data collection, and component refinement.

In Cowley’s view, a fully commercialized fusion reactor is unlikely to be ready before the middle of the century. Startups face intense market pressure to accelerate their timelines because securing multi-million-dollar funding rounds requires presenting private investors with a clear, near-term path to revenue.

The final cost of the electricity will also heavily influence the technology’s viability. General Fusion estimates its levelized cost of energy (LCOE) will fall between $64 and $73 per megawatt-hour. Commonwealth Fusion Systems—an MIT spin-off utilizing high-temperature superconducting (HTS) magnets to build a compact tokamak called SPARC—has set an even more aggressive target of around $50 per megawatt-hour.

By comparison, the Nuclear Energy Agency estimates the cost of newly constructed conventional fission plants in the United States at approximately $71 per megawatt-hour, while utility-scale solar generation sits at about $38 per megawatt-hour.

Advanced computing, machine learning, and artificial intelligence are rapidly improving scientists’ ability to model, predict, and control volatile plasma behavior. The transition from computer models to physical hardware remains the industry’s primary hurdle.

As Cowley observed, physics researchers have successfully figured out how to “put the Sun in a bottle.” The challenge now belongs to engineers and utilities: “We haven’t put it in a commercial bottle.”