Proxima Fusion Raises €411M: Europe’s Largest-Ever Fusion Bet Draws Google and RWE

What Proxima Fusion Actually Raised

On July 7, 2026, Proxima Fusion announced it had closed a €411 million (roughly $469 million) Series A2 round, co-led by XTX Ventures and East X Ventures, pushing the company’s valuation to €2.4 billion (about $2.7 billion). The round is described by the company itself as the largest private fusion financing round ever closed in Europe, and it makes Proxima Fusion the continent’s first fusion-energy unicorn.

The investor list is unusual for a company still years from generating a single watt of net power. Alongside the co-leads, Google and the German utility RWE joined as strategic investors, with RWE contributing €25 million directly tied to a plant-siting partnership. Returning backers from Proxima’s earlier rounds — Balderton Capital, Cherry Ventures, Plural, UVC Partners, DST Global Partners — participated again, joined by new strategic and public money from KfW Capital, SPRIND (Germany’s federal innovation-funding agency), and Burda Principal Investments. Counting €95 million in public grants layered in over time, Proxima Fusion has now raised more than €650 million in total, making it, according to The Fusion Report’s mid-2026 funding tracker, the most highly funded fusion company in Europe and the sixth-most-funded fusion company worldwide.

Proxima Fusion is a spin-out of the Max Planck Institute for Plasma Physics (IPP), founded roughly three years before this announcement to commercialize stellarator research built on decades of work at IPP’s Wendelstein 7-X experiment — the world’s largest stellarator, based in Greifswald. Unlike Wendelstein 7-X, which was built to prove continuous plasma operation, Proxima’s Alpha demonstrator is designed specifically to validate the energy-confinement scaling and heat-removal engineering a commercial power plant needs.

Why Google and RWE Are Betting on a Reactor That Doesn’t Exist Yet

The money is arriving against a backdrop where fusion is still a rounding error in global energy investment. The Fusion Report puts total lifetime private funding across the entire commercial fusion sector at $11.52 billion as of June 30, 2026 — up $2.4 billion from a year earlier — while fusion overall captures less than 1% of global venture capital, against roughly $510 billion in VC deployment during the first half of 2026, where AI alone took an estimated 70% of second-quarter dollars. Four companies worldwide have crossed $1 billion in lifetime funding, per The Fusion Report‘s mid-2026 tracker: Commonwealth Fusion Systems at $2.923 billion, Helion Energy at $1.502 billion, TAE at $1.321 billion, and Shine Fusion at $1.040 billion. On July 30, 2026, Commonwealth Fusion Systems itself added another $1 billion round on top, pushing its cumulative total to roughly $4 billion and underlining just how capital-hungry the category has become even for its leaders.

Against that backdrop, a European company drawing Google and a national utility into a single round is a distinct kind of signal. Google’s involvement marks the company’s first direct fusion bet in Europe, arriving as hyperscalers globally chase firm, always-on power for AI data centers and increasingly look past renewables-plus-storage toward baseload alternatives. RWE’s participation is not passive: the utility has partnered with Proxima to build Stellaris, a planned commercial stellarator plant, at the site of a former nuclear fission facility in Gundremmingen, Bavaria — a location choice that reuses existing grid connections and cooling infrastructure rather than starting from a greenfield site. The financing itself moved fast: it closed within roughly three months of a February 26, 2026 memorandum of understanding among the Free State of Bavaria, RWE, and the Max Planck Institute for Plasma Physics, though Proxima still needs an additional €1.2 billion in federal funding that has not yet been committed. CEO Francesco Sciortino framed the round as evidence that “Europe can not only invent breakthrough technologies, but also build globally competitive companies around them,” while IPP’s scientific director Sibylle Günter said the “joint approach — combining scientific excellence, industrial implementation, and private capital — is convincing on an international level.”

What Deep-Tech Investors and Energy Buyers Should Do About It

1. Read the round as a milestone bet, not a revenue bet

Proxima Fusion has no product, no offtake customer, and no functioning reactor — the €2.4 billion valuation is priced entirely on the credibility of hitting the Alpha net-energy milestone in the early 2030s and Stellaris shortly after. Investors and corporate partners evaluating a position in this round (or the next one) should model the valuation against milestone-completion risk, not discounted cash flow. Commonwealth Fusion Systems’ parallel $1 billion round on July 30, 2026, priced against its Sparc reactor’s 2027 breakeven target, shows the same logic at a different stage — the earlier the milestone, the more the valuation compresses toward “prove it first.”

2. Treat strategic corporate money as a demand signal, not a subsidy

Google and RWE are not writing checks out of philanthropy. Google is chasing firm power for AI infrastructure that renewables-plus-storage cannot yet reliably deliver at hyperscale, and RWE is securing first-mover access to a technology it may need to replace its own retiring fission and coal capacity. Anyone reading this round as a signal about fusion’s investability should separate the strategic-buyer logic (secure future supply, learn the technology early) from the financial-return logic (a 2.4x-plus paper markup on a company that raised at a much lower valuation in its prior round) — they point in different directions on risk tolerance.

3. Model 2030s timelines into planning, not 2026 ones

Alpha is targeted for the early 2030s and Stellaris for “later that decade” — realistically 2035 or beyond before any commercial electron reaches a grid. Utilities, industrial energy buyers, and data-center operators exploring fusion power-purchase conversations today should treat this as a decade-plus planning horizon, not an near-term hedge against 2026-2028 power shortages. Building fusion into a 2027 capacity plan is premature; building it into a 2035 diversification strategy is defensible.

4. Watch the government co-funding gap as the real risk factor

Proxima still needs roughly €1.2 billion in additional federal funding that Germany has not yet committed, on top of the €650 million-plus already raised privately and in grants. That gap — not the technology risk alone — is the most concrete near-term threat to the Alpha/Stellaris timeline. Investors and partners should track German federal budget decisions on fusion as closely as they track Proxima’s own engineering milestones; a funding shortfall at the federal level could delay Alpha regardless of private capital availability.

5. Benchmark against the full funding table before over-weighting one company

Proxima’s €650 million-plus lifetime funding ranks sixth globally and first in Europe, but it remains well behind Commonwealth Fusion Systems’ $2.923 billion. Anyone constructing an exposure thesis to fusion — direct equity, a diversified basket of listed fusion players, or a corporate partnership — should benchmark against the full table (CFS, Helion, TAE, Shine Fusion, Proxima) rather than treating one high-profile European round as representative of the sector’s overall maturity or risk profile.

Where This Fits in Europe’s 2026 Fusion Race

Proxima Fusion’s round matters less as a single transaction and more as confirmation that Europe now has a fusion contender that can draw the same category of strategic investor — a hyperscaler, a major utility, a national innovation-funding agency — that has so far clustered mostly around US-based players like Commonwealth Fusion Systems and Helion. The Max Planck Institute pedigree and the Bavarian government’s direct involvement via the February 2026 memorandum give Proxima a state-backed credibility that few deep-tech startups anywhere can claim, but that same closeness to government also means its timeline is now partly hostage to a federal funding decision outside the company’s control. For the broader fusion sector, the round is a data point in a trend rather than an outlier: total lifetime private funding grew by $2.4 billion in the twelve months to June 2026, and four to five companies globally can now credibly claim to be racing toward a commercial demonstrator within a decade. Whether Europe’s entrant reaches Alpha before its American and Chinese rivals reach their own milestones will be decided less by this round’s size than by whether the remaining €1.2 billion in federal co-funding actually materializes on schedule.

Frequently Asked Questions

Sources & Further Reading

• Proxima Fusion Raises €411 Million to Build Europe’s Commercial Fusion Champion — Proxima Fusion
• Google, RWE Back Proxima Fusion in €411 Million Financing Round — Global Banking & Finance Review
• Proxima Fusion Raises €411 Million from Google, RWE — Tech Funding News
• Proxima Fusion Raises 411 Million Euros — Max Planck Society
• Commercial Fusion Energy Funding Status: Mid-Year 2026 — The Fusion Report
• Fusion Power Darling Commonwealth Fusion Systems Raises Another $1B — TechCrunch