European Fusion Energy Milestone
Proxima Fusion Raises €411M, Valued at €2.4 Billion, Advancing Europe's Commercial Fusion Energy Future
Key Points
The €411 million round was led by XTX Ventures and East X Ventures, with strategic backers including Google and RWE, underscoring strong cross-border and strategic investor interest in Europe’s fusion push.
Proxima was founded as a spinout from the Max Planck Institute for Plasma Physics in 2023, and its core approach is the stellarator design that uses magnets to confine hot plasma for fusion.
A framework agreement signed by Proxima, RWE, Bavaria, and the Max Planck Institute for Plasma Physics aims to pursue a commercial fusion facility, with Gundremmingen identified as the prospective site for the future plant.
Proxima is funding and building the Alpha demonstrator near Munich — a net-energy stellarator intended to validate key fusion technologies ahead of any commercial plant.
Alphabet/Google’s participation is framed as a lasting commitment to Europe’s fusion ambitions and is described as one of the largest fusion-sector investments in Europe to date, reflecting broader strategic moves in nuclear energy.
Munich-based Proxima Fusion has raised €411 million in one of Europe's largest private tech investments of the year, valuing the fusion startup at €2.4 billion — roughly $2.7 billion — according to PitchBook. The round was led by XTX Ventures and East X Ventures, with strategic backing from Google and German energy giant RWE.
The company, spun out of the Max Planck Institute for Plasma Physics in 2023, is building a stellarator-based fusion reactor. A stellarator uses powerful magnets to hold super-hot plasma in place — the key step needed to produce fusion energy. The funding puts Proxima on a path toward a working commercial plant by the late 2030s.
Google and RWE Bet Big on German Fusion
Alphabet, Google's parent company, joined RWE — one of Germany's biggest energy firms — as strategic investors in the round, according to Benzinga. New backers also include KfW Capital, SPRIND, and Burda Principal Investments. Existing investors topped up their stakes as well. The deal is described as one of the largest fusion-sector investments ever made in Europe.
Google's involvement signals more than just a financial bet. Seeking Alpha noted Alphabet has been expanding its interest in nuclear energy broadly. For RWE, the investment fits a strategy to secure clean, firm power as Europe tries to cut dependence on Russian gas and meet growing electricity demand from factories and data centers.
Alpha Demonstrator Aims to Prove Fusion Works by 2031
Proxima is now building a facility near Munich called Alpha. It is a net-energy stellarator — meaning it aims to produce more energy than it consumes. That would be a landmark moment for fusion power. The company is targeting operation around 2031, according to PitchBook.
If Alpha succeeds, it would validate the core technology before Proxima moves to a full commercial plant. The €411 million raise is designed to fund that entire demonstrator phase. Getting a working stellarator online would mark a major step beyond the pilot-project stage that has defined fusion for decades.
Gundremmingen Nuclear Site to Host First Commercial Plant
Proxima has signed a framework agreement with RWE, the state of Bavaria, and the Max Planck Institute for Plasma Physics. The deal names Gundremmingen — a former nuclear power plant in Bavaria — as the site for Europe's first commercial fusion facility, according to Yahoo Finance. The target date is the late 2030s.
Reusing a former nuclear site makes practical sense. Gundremmingen already has grid connections, cooling infrastructure, and regulatory history. Bavaria's involvement also signals political support, which matters for a technology that still needs new safety and licensing rules written around it.
Fusion Sector Gains Momentum but Challenges Remain
Proxima's raise comes as the fusion industry attracts serious capital worldwide. The €2.4 billion valuation puts it among the most valuable private fusion companies in Europe. Analysts say the funding builds confidence that fusion could move from lab experiments to market-ready power within this decade, according to Yahoo Finance.
Still, real hurdles remain. Fusion has no established commercial regulatory framework in most countries. Building and running a stellarator at commercial scale has never been done. Proxima must prove Alpha works by 2031 — then raise even more capital to build the full plant. The clock is running.
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