In an ambitious stride towards sustainable energy, Proxima Fusion is taking on the monumental challenge of nuclear fusion with its innovative stellarator design. Co-founder and CEO Francesco Sciortino is undeterred by sceptics who once dismissed their vision as impossible. With the promise of limitless, low-cost, and clean electricity on the horizon, Proxima’s efforts could very well redefine the future of energy.
The Quest for Fusion Energy
Nuclear fusion, the process that powers our Sun, involves fusing hydrogen nuclei to release vast amounts of energy. Achieving this on Earth, however, requires overcoming formidable obstacles. Unlike nuclear fission, which splits atoms and is currently used in nuclear power plants, fusion combines light elements under extreme temperatures—much hotter than those found in the Sun itself. The typical fuel for this process is a mix of tritium and deuterium, isotopes of hydrogen, heated to create a plasma state that must be carefully controlled to ignite fusion.
Why Stellarators?
While most fusion research has focused on the tokamak design—a doughnut-shaped device that employs powerful magnets to confine plasma—Proxima Fusion is opting for the more intricate stellarator. This complex machinery features twists and turns that make it inherently more challenging to build and operate. Sciortino describes the tokamak as a “beast” compared to the stellarator’s “little cat” nature, which, if successful, could simplify the management of the hot plasma.
“A stellarator should be a ‘dumb machine,’ much like a microwave oven,” Sciortino notes. The key to this design is that its unique shape can enhance plasma control, potentially offering significant advantages over the more conventional tokamak approach.
Investment and Development
The stellarator, dubbed Alpha, will leverage decades of research from Germany’s Max Planck Institute for Plasma Physics. The goal is ambitious: to generate more energy than it consumes. Currently, Proxima Fusion is securing investment, having recently received €400 million (£340 million; $460 million) from the Bavarian government, while also vying for more than $1 billion from the federal government, with a decision expected next year.
Competing in a landscape with over 50 fusion projects globally, Proxima is aware of the urgency to advance. One notable competitor is the UK’s STEP (Spherical Tokamak for Energy Production), which is backed by the British government and aims to create a prototype power plant on a former coal site in Yorkshire. Ryan Ramsey, the director of STEP, acknowledges the tokamak’s historical advantage in experimental success and the straightforward nature of its magnetic systems.
Overcoming Engineering Challenges
Sciortino is acutely conscious of the hurdles Proxima faces in terms of engineering and production. The intricate design of the stellarator’s magnets presents both a financial and logistical challenge. He admits to “losing sleep” over whether the company can develop these complex magnets quickly and affordably enough to make the project viable.
Germany’s manufacturing prowess could provide a crucial advantage. With an estimated 550,000 CNC machinists—experts in operating advanced machinery—compared to only 350,000 in the US, Proxima is well-positioned to harness local talent for precision machining. This is especially vital given that the magnets require a high-grade, costly steel that demands meticulous fabrication.
The timeline is tight; while the W7-X stellarator took over a decade to build, Sciortino aims to have Alpha operational in just a third of that time. Prototypes of the magnetic coils are already in development, with hopes to begin testing next year. Once these are validated, Proxima plans to construct 40 more coils to complete Alpha, with a factory already under construction to meet this ambitious target.
Collaboration and Competition
The fusion industry is rife with collaboration and competition. Sciortino believes that Europe could become a leader in this burgeoning field, especially given the continent’s focus on manufacturing. He reflects on how Europe missed out on the digital revolution, yet still boasts a skilled workforce in engineering and production.
At STEP, Ramsey echoes this sentiment, emphasising that the fusion sector has matured beyond mere theoretical research. “There’s real momentum across fusion right now, and that should be seen as a strength rather than something to divide,” he asserts.
Why it Matters
The efforts of Proxima Fusion and its peers represent not just a race towards clean energy but a potential transformative leap for our global energy landscape. As the world grapples with climate change and seeks sustainable solutions, successful nuclear fusion could provide a virtually inexhaustible energy source. The implications are staggering: a future free from fossil fuels, with clean energy accessible to all. The stakes have never been higher, and the journey towards fusion energy is one that could redefine our relationship with power for generations to come.
