A European champion for fusion: Proxima Fusion spins out of the Max Planck Institute for Plasma Physics

May 30, 2023

Munich, May 30th 2023 – Proxima Fusion, a fusion start-up that is designing fusion power plants based on the stellarator concept, completed its pre-seed fundraising of €7m. The fundraising is co-led by Plural and UVC Partners, and joined by High-Tech Gründerfonds (HTGF) and the Wilbe Group.

Proxima Fusion is the first spin-out from the Max Planck Institute for Plasma Physics (IPP). The startup was founded by former scientists and engineers from the Max Planck IPP, MIT, and Google-X. The group aims to deploy a new high-performance stellarator over the coming years. Its roadmap targets a first-of-a-kind fusion power plant within the 2030s.

Fusion is the process that powers the stars. To make it possible on Earth, one can confine high-energy ionized matter, called “plasma”, via magnetic fields. Tokamaks and stellarators are two approaches that do so by creating a magnetic “cage” in doughnut-shaped devices. Stellarators use a complex set of electromagnets outside of the plasma, whereas tokamaks combine external electromagnets with a large current within the plasma, which simplifies the overall design but incurs significant control challenges. Modern magnetic confinement devices can already routinely reach plasmas at more than 100 million degrees – 10 times the temperature at the center of the Sun. The opportunity to leverage fusion as a safe, clean, and abundant energy source has motivated academic research in this domain for decades.

The Proxima Fusion project stands on the shoulders of IPP’s Wendelstein 7-X (W7-X), which is by far the most advanced stellarator in the world. Although more complex in design than tokamaks, stellarators present compelling features for a fusion power plant: they can operate in a steady state, with smaller operational challenges, and present an attractive solution to manage excessive heat loads on material surfaces. However, stellarators have long been affected by major drawbacks: poor plasma confinement at high temperatures, high losses of fusion products, challenging construction tolerances, etc.. Many of these challenges have been solved in recent years:

Experimental progress from W7-X and recent advances in stellarator modeling have radically changed the picture. Stellarators can now remedy the key problems of tokamaks and truly scale up, radically improving the stability of the plasma and reaching high performance in steady state.

Francesco Sciortino, co-founder and CEO of Proxima Fusion

The performance of fusion devices has historically been quantified with the “triple product” of density, temperature, and confinement time. Since the start of its operations in 2015, W7-X has been rapidly catching up over the most advanced tokamaks, which have collectively received vastly more funding so far. However, the triple product says little of the engineering and economic viability of a fusion concept for power plants. W7-X excels in these respects: its February 2023 record of energy turnaround [1], i.e. the total heating power multiplied by the duration of the experiment, is only the latest demonstration of how stellarators like W7-X are superior in a number of important ways.

Figure: triple product of ion density, ion temperature and energy confinement time as a function of the time the triple product was sustained. Adapted from Refs. [2] and [3].

Proxima Fusion is based in Munich, Germany’s most active deep-tech hub. Its proximity to one of IPP’s research centers aims to maximize opportunities for collaboration with the Institute.

We are building on decades of visionary investment by the German government in stellarator technology. It is this investment that created the opportunity for Proxima to be a European champion for fusion. Now, it is up to us to bring fusion energy to the grid.

Jorrit Lion, a co-founder and expert in the modeling of stellarator power plants

Martin Kubie, joining his co-founders after a decade of work in the McLaren Formula-1 team, Google-X and its spin-off Wing, acknowledges the hard work ahead:

Fusion is the challenge of our time. Our task will be to make it a commercial reality. Over the next 12 months, in collaboration with its academic and industry partners, Proxima will focus on completing its initial fusion power plant design.

Martin Kubie, a co-founder of Proxima Fusion

Stellarators offer the most robust and clearest path to fusion energy. The Proxima team has the energy and the speed that we need. They are ecosystem players, with a thrilling sense of ambition building on top of the Wendelstein 7-X stellarator – a masterpiece of German leadership. Europe needs the audacity of this team and their willpower to take on the fusion challenge.

Ian Hogarth of Plural Platform

In the coming years, the energy issue will be one of our most existential ones. We already know today that we need a clever mix of different energy sources. Proxima’s efforts for fusion leverage the massive investment made on stellarators in Germany. We are convinced that the team is ready to change the picture – for the world, and particularly for Germany and Europe, which are in urgent need of reliable sources beyond wind and solar.

Benjamin Erhart, General Partner at UVC Partners.

Proxima Fusion Team

About Proxima Fusion
Fusion will be one of the greatest breakthroughs of this century. Proxima Fusion is working to develop power plants via optimized stellarators, devices that form magnetic cages for high-energy matter. Proxima is the first-ever spin-out company from the Max Planck Society Institute for Plasma Physics, which built and operates the most advanced stellarator on the planet, W7-X. Research over the past decade has now set the stage for Proxima to leverage modern optimization tools and design capabilities, and accelerate fusion. With W7-X reaching high-performance in continuous operation, uniquely among fusion concepts, Proxima Fusion is catalyzing the creation of a new fusion ecosystem in Europe. Connecting partners from industry and academia, the Proxima Fusion founding team, coming together from the Max Planck Society, MIT and Google, is now entering the race for fusion energy to turn stellarators into economically viable fusion power plants.
For further questions, contact: press@proximafusion.com

About Plural
Set up by founders for founders, Plural is an investment platform focusing on providing early stage venture capital to exceptional European tech companies & founders addressing opportunity gap and tackling systemic risks. Its investors with scar tissue support founders to build tech companies that can make a GDP impact.

About UVC Partners
UVC Partners is a Munich- and Berlin-based early-stage venture capital firm that invests in European start-ups, from pre-seed to series A, across deep tech, climate tech, hard- and software, and mobility. As an independent partner of UnternehmerTUM, Europe’s most extensive innovation center, UVC Partners has access to proprietary deal flow, an industrial network of more than 1,000 corporates, and access to talent from the leading European technical university.

About Wilbe
Wilbe is a venture group that supports entrepreneurial scientists from leading academic institutions in developing disruptive and high impact science companies through education, venture building, investment and operational support. Wilbe has worked alongside Proxima Fusion from its early stages.

About High-Tech Gründerfonds
The seed investor High-Tech Gründerfonds (HTGF) funds technology start-ups with growth potential and accompanied more than 700 start-ups since 2005. With the start of its fourth fund, HTGF has about EUR 1.4 billion under management. The team consisting of experienced investment managers and start-up experts supports young companies with knowhow, entrepreneurial expertise, and passion. HTGF’s focus are high-tech incorporations in the areas digital tech, industrial tech, life sciences, chemistry and related business fields. To date, external investors invested more than EUR 4.5 billion over more than 2,000 follow-up financing rounds into the HTGF portfolio. Moreover, the fund successfully sold its shares on more than 170 companies.

The fund investors of this public-private partnership include the Federal Ministry for Economic Affairs and Climate Action, KfW Capital, the Fraunhofer Society, as well as more than 40 companies from various fields.

Media contact
High-Tech Gründerfonds Management GmbH
Tobias Jacob, Senior Marketing & Communications Manager
T.: +49 228 – 82300 – 121
t.jacob@htgf.de


[1] https://www.ipp.mpg.de/5322229/01_23
[2] Kikuchi and Azumi, Frontiers in Fusion Research II, Springer, Berlin, 2015
[3] Wolf et al., Physics of Plasmas 26, 082504, 2019.

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