Google and RWE Bet €411 Million on Fusion Startup Proxima Fusion

July 10, 2026 4 min read

Google and German energy giant RWE have committed €411 million to Proxima Fusion, a Munich-based fusion energy startup, in one of the largest single financing rounds for nuclear fusion technology in Europe. The investment signals growing confidence that commercial fusion power, long promised but never delivered at scale, may finally be approaching viability. The funding will accelerate construction of a demonstration reactor, with the company targeting a working prototype by the early 2030s.

The Deal and What It Includes

The €411 million represents a Series A round, with Google Ventures and RWE's clean energy division co-leading the investment alongside several undisclosed institutional investors. Proxima Fusion will use the funds to scale its engineering team from roughly 80 researchers to over 300 and begin site preparation for a pilot facility in Bavaria. The company confirmed its headquarters in Munich will serve as the primary development hub.

Unlike traditional tokamak designs that rely on superconducting magnets, Proxima Fusion's approach uses high-temperature superconducting tapes arranged in a novel stellarator configuration. The company claims this design can achieve net energy gain while maintaining plasma stability for longer periods than conventional reactors. The technology stems from research originally conducted at the Max Planck Institute for Plasma Physics.

Why Google Entered Fusion

Google has previously backed early-stage energy projects through its venture arm, but this marks the company's most substantial commitment to fusion technology to date. The tech giant has pledged carbon neutrality by 2030 and sees advanced nuclear power as essential to meeting that target. The company declined to specify its exact share of the €411 million round.

"Data centres require enormous amounts of reliable power," a Google spokesperson told reporters. "Fusion offers the prospect of clean, baseload electricity without the waste concerns of fission." The company operates server infrastructure across multiple continents, including facilities in Texas, Oregon, and Singapore.

RWE's Bet on the Energy Transition

RWE, Germany's largest power producer, is undergoing a strategic shift away from coal and toward renewable and next-generation energy sources. The utility has already invested heavily in offshore wind and solar farms across Europe. Executive board member Katja Böttger confirmed RWE views fusion as a long-term complement to wind and solar, particularly for industrial demand that requires continuous power supply.

The company operates power stations in Germany, the Netherlands, and the United Kingdom. Its involvement brings industry credibility and potential access to grid infrastructure, which Proxima Fusion will need when moving from prototype to commercial deployment. The partnership also positions RWE to secure power purchase agreements with the startup once a reactor becomes operational.

Fusion's Long Road to Commercial Viability

Fusion energy mimics the reactions that power the sun, combining hydrogen atoms at extreme temperatures to release enormous amounts of energy without carbon emissions or long-lived radioactive waste. Scientists have pursued the technology for decades. The International Thermonuclear Experimental Reactor project in southern France, backed by 35 nations, expects to achieve first plasma by the end of this decade but remains years behind its original schedule.

Private investment in fusion has accelerated recently. Commonwealth Fusion Systems, a spinout from the Massachusetts Institute of Technology, raised over $1.8 billion in 2021. Helion Energy, backed by Sam Altman, secured $375 million in 2021 and another $250 million in 2023. TAE Technologies in California has collected more than $1 billion in private capital over the past decade.

Challenges Ahead for Proxima Fusion

Despite the funding boost, significant hurdles remain. Fusion requires heating hydrogen plasma to temperatures exceeding 100 million degrees Celsius, then containing it long enough to extract usable energy. No private company has yet demonstrated net energy gain, where the reactor produces more power than it consumes. Proxima Fusion must also navigate regulatory approvals, supply chain constraints for specialized superconducting materials, and the immense cost of building demonstration reactors.

The timeline from prototype to commercial power plant typically spans decades. Utility companies and governments have historically been cautious about committing to nuclear projects with such long payback periods. Proxima Fusion will need to demonstrate technical milestones consistently to maintain investor confidence, with performance targets set at six-month intervals under the terms of the financing agreement.

What Happens Next

Proxima Fusion expects to break ground on its Bavaria demonstration site by 2026, pending environmental and zoning approvals from local authorities. The company plans to hire aggressively across plasma physics, materials science, and mechanical engineering over the next 18 months. RWE has indicated it will explore joint development of grid connection infrastructure once the pilot design reaches a more advanced stage.

Investors will watch closely for the company's first plasma experiment, currently scheduled for 2028. Whether that milestone delivers on its technical promises will likely determine whether additional capital flows into the sector or whether fusion faces another period of investor skepticism. The outcome will also influence how other utilities approach long-term decarbonisation strategies, particularly in energy-intensive industries like steel and cement production.