Google’s parent company Alphabet and German energy firm RWE have joined a record $468 million funding round for Proxima Fusion, a Munich-based nuclear fusion startup developing stellarator reactor technology and targeting construction of Europe’s first commercial fusion power plant in the 2030s. The round, announced on July 7, values the three-year-old company at €2.4 billion and ranks among the largest financing events in the history of the fusion energy sector.
What Happened
Proxima Fusion raised €411 million (approximately $468 million) in a round led by XTX Ventures, the investment arm of algorithmic trading firm XTX Markets, alongside London-based East X Ventures. Alphabet’s Google and German utility company RWE AG joined as strategic investors. The capital will be used to advance Proxima’s stellarator technology toward a fusion demonstrator — a proof-of-concept device at meaningful scale — that the company aims to complete in the early 2030s, ahead of a pilot plant and eventual commercial power generation.
Stellarators use a complex magnetic field geometry to confine plasma and offer potential advantages in stability over the more widely funded tokamak design, though they require highly precise engineering to build. Proxima’s founders include scientists from the Max Planck Institute for Plasma Physics, which operates the Wendelstein 7-X stellarator in Greifswald — one of the most advanced fusion experiments currently running in the world.
Why It Matters
Google’s investment in Proxima is part of a deliberate strategy to hedge its long-term energy supply across continents. In June 2025, Alphabet signed a power purchase agreement with US-based Commonwealth Fusion Systems for 200 megawatts of fusion electricity in Virginia; the Proxima deal fills in the European side of that picture. The motivation is unmistakable: Google’s AI buildout drove a record 37% surge in electricity consumption in 2025, and the company is acutely aware that grid power constraints and rising energy costs could cap its ability to expand AI compute capacity indefinitely.
For the broader fusion industry, the round signals renewed confidence from both the technology and energy sectors. Private fusion investment has been accelerating since the National Ignition Facility achieved ignition in December 2022, and Proxima’s raise is among the largest a pure-play fusion startup has completed. Energy and cooling innovations are emerging as critical constraints on AI infrastructure, with venture and corporate capital flowing into everything from water-efficient cooling to long-duration storage. Fusion represents the most ambitious long-term answer to that challenge.
Background and Context
Proxima Fusion was founded in 2023 as a spin-out from the Max Planck Institute and has grown rapidly to become one of Europe’s most prominent fusion companies. Its stellarator approach differs from that of US competitors such as Commonwealth Fusion Systems, which uses a high-temperature superconducting tokamak, and TAE Technologies, which pursues a field-reversed configuration. Stellarators are less commercially mature than tokamaks but offer the potential for continuous rather than pulsed plasma operation, a characteristic that may prove advantageous for grid-scale power delivery.
RWE’s participation as a strategic investor adds significant weight to the deal. As one of Europe’s largest electricity producers and a major developer of offshore wind capacity, RWE has a direct commercial interest in whether fusion becomes viable before mid-century. Its presence suggests that at least some major utilities are beginning to treat fusion as a credible planning scenario rather than a distant scientific ambition — a meaningful shift in how the energy industry approaches long-range investment.
What Comes Next
Proxima’s near-term milestone is its fusion demonstrator, targeted for the early 2030s. From there, the company’s roadmap moves toward a pilot plant and ultimately a commercial plant feeding electricity into the European grid. The timeline is ambitious and dependent on sustaining technical progress across plasma physics, materials science, and high-precision manufacturing simultaneously.
Whether commercial fusion power arrives in the 2030s or slips beyond that window, the widening flow of capital into the sector reflects a growing consensus that the technology’s moment has shifted from theoretically possible to practically plausible. For Google, RWE, and their co-investors, a stake in a €2.4 billion fusion company is a hedge on the possibility that clean, abundant power may arrive sooner than conventional energy models have assumed.
