Google has backed Proxima Fusion, a Germany-based company developing stellarator fusion technology, in a 411 million euro ($468 million) funding round. The deal pushes Proxima to a $2.7 billion valuation and marks the company as Europe’s best-funded fusion startup by a wide margin. For anyone tracking where corporate capital is flowing in the clean firm energy space, this round is worth reading closely, not just as a fusion story but as a statement about how technology companies are thinking about long-term power supply.
What the deal actually involves
The round was led by XTX Ventures and East X Ventures, with RWE and Google participating as strategic investors. A wider group of venture firms, including Plural, UVC Partners, Balderton and Cherry Ventures, also took part. Proxima is pursuing stellarator technology, one of several competing approaches to fusion, and is targeting a fusion demonstrator, a proof-of-concept precursor to a commercial plant, in the early 2030s. A commercial power plant is targeted for later in that decade.
Fusion works by combining two hydrogen atoms into one helium atom, releasing large amounts of energy in the process. This is different from every nuclear plant currently operating commercially, which relies on fission, the splitting of atoms. Fusion has long been described as a potentially abundant, carbon-free energy source, but it has never been deployed at commercial scale, and the industry is still working through significant technical hurdles.
Proxima said the new funding will go toward expanding production of high-temperature superconducting cable and magnets, along with building out the engineering and manufacturing systems needed for stellarators. The company also plans to hire across engineering, manufacturing and operations. This is a useful detail for anyone assessing the round. It shows the capital is being directed at industrial scale-up capability, not just research, which is consistent with a company trying to move from demonstration to commercial deployment within roughly a decade.
Why Google is doing this
Google described the investment as reflecting its continued interest in fusion as a potential source of abundant, carbon-free, firm energy over the long term. That framing matters. Firm power, meaning electricity that is available on demand rather than dependent on weather conditions, is what large technology companies increasingly need as their computing and data center loads grow. Fusion, if it becomes commercially viable, would offer that kind of firm output without the emissions profile of fossil generation.
This is not Google’s first move in the space. The company is also an investor in Commonwealth Fusion Systems, a U.S.-based fusion developer, and signed an offtake agreement with CFS in June 2025 for power once its first commercial plant is operational. At the time, Google described fusion as clean, abundant, inherently safe and buildable almost anywhere, while also acknowledging that commercializing the technology is immensely challenging with no guarantee of success. That combination of enthusiasm and caution is worth noting. Google is treating fusion as a call option on future energy supply rather than a near-term solution, spreading its bets across more than one company and more than one technical approach.
How the funding landscape compares
Proxima’s round is large by European standards, but it is still modest next to the sums being raised by leading U.S. fusion companies. Commonwealth Fusion Systems raised $863 million in August, bringing its total funding to $2.9 billion. Sam Altman-backed Helion Energy raised $465 million in its most recent round, taking its total to $1.5 billion. Against that backdrop, Proxima’s 411 million euro round establishes it as a credible European contender, but the funding gap with U.S. peers remains substantial.
Francesco Sciortino, Proxima’s cofounder and CEO, framed the round as evidence that Europe can build globally competitive companies around breakthrough technology, not just invent it. He also pointed to the geopolitical dimension of the race, noting that Europe is competing with the United States and China to reach the first commercial fusion power plant. That competitive framing is likely to shape how governments and strategic investors in Europe approach fusion funding going forward, particularly as energy security and industrial policy considerations increasingly overlap with climate goals.
What this means for the industry
For businesses operating in or advising on the nuclear and clean firm energy space, this deal reinforces a few points. First, large technology companies are now acting as direct strategic investors in fusion, not just future customers, which brings both capital and credibility to a sector that has historically struggled to attract funding at this scale. Second, the geographic spread of serious fusion players, from the U.S. to Germany, indicates that no single region has a clear lead yet, which creates room for policy, talent and supply chain decisions in the next few years to shape where the industry’s center of gravity ends up.
Looking ahead, expect fusion funding rounds to keep growing in size through the rest of this decade, particularly as more demonstrator projects approach operational status and early offtake agreements, like the one between Google and Commonwealth Fusion Systems, start to appear more frequently. If Proxima and its close competitors hit their early 2030s demonstrator timelines, the period between 2032 and 2035 is likely to be the point where investment shifts from speculative early-stage bets toward more conventional project financing, similar to what has already happened in advanced fission and small modular reactor development. Until then, fusion will likely remain a strategic, long-horizon allocation for large corporate balance sheets rather than a mainstream part of near-term energy procurement strategies.
