Google invests in Proxima Fusion’s push to build Europe’s first commercial fusion power plant

Google is putting money behind Proxima Fusion, a Germany-based nuclear fusion startup developing a “stellarator” approach, in a funding round reported at 411 million euros (about $468 million). The investment adds to Alphabet’s broader interest in long-term clean energy technologies rather than near-term electricity generation, according to coverage of the round.

The round, Proxima Fusion said it led toward building what it calls Europe’s first commercial fusion power plant. Nuclear fusion works by combining hydrogen atoms to release energy, while today’s commercial nuclear plants rely on fission, which splits atoms. Proxima’s effort is aimed at commercializing a technology that still has not been deployed at power-plant scale.

CNBC reported that the financing was led by XTX Ventures and East X Ventures, with RWE and Google participating as strategic investors. Other venture backers included Plural, UVC Partners, Balderton, and Cherry Ventures, according to CNBC’s reporting of Proxima’s announcement.

Proxima Fusion, which hit a valuation reported by CNBC in the $2.7 billion range, said the funding would help it expand its work on high-temperature superconducting components, a key enabling technology for advanced fusion systems. The company also described plans to bring its fusion demonstrator, framed as a proof-of-concept precursor to a commercial plant, online in the early 2030s.

Fusion investors are racing to overcome multiple hurdles, including creating and sustaining the extreme conditions required for fusion and engineering systems that can run reliably over long periods. Proxima’s choice of stellarator technology is one of several main approaches in the field, each with different engineering tradeoffs for controlling plasma and building the necessary magnet systems.

For Alphabet, the bet sits inside a pattern of corporate investments in climate-adjacent technology where outcomes could be years or decades away. Fusion is often viewed by governments and industry participants as a potential source of abundant, firm, carbon-free electricity, which helps explain why companies with large research footprints are willing to support early-stage and pre-commercial work.

What Proxima and its backers did not detail in the publicly circulated coverage is how quickly the company expects to validate performance targets, what specific regulatory pathway it is pursuing for a power-plant buildout, or what technical milestones must be met to avoid schedule slip. As with other fusion efforts, the core uncertainty is whether scientific progress can be translated into a commercially workable system on the timelines the industry is targeting.