Proxima Fusion Raises €411 Million in Record Round, Becomes Europe’s Most Valuable Fusion Company
Proxima Fusion raises €411M at a €2.4B valuation, attracting RWE and Google as investors and funding a €2B Alpha demo reactor to advance fusion energy.
Proxima Fusion said on Tuesday it closed a record €411 million financing round that values the Munich-based start-up at €2.4 billion, a milestone that positions it as Europe’s most highly valued fusion company. The fresh capital reinforces the company’s plans to accelerate development of fusion energy and build a demonstration reactor called Alpha in Garching. Company executives framed the round as a signal that international investors trust Europe’s scientific base and its prospects for turning fusion research into industry-scale companies.
Record Financing and Valuation
Proxima’s newest round brings its total financing in under three years to more than €650 million, the company reported, including roughly €95 million from public grants. The €411 million raise alone pushed its post-money valuation to €2.4 billion, surpassing previous European peers. Founders say the valuation reflects investor confidence in Proxima’s speed of progress and its commercial trajectory in fusion energy.
Investor Line-up and Strategic Partners
The financing round was led by XTX Ventures and East X Ventures, with strategic participation from energy group RWE and technology firm Google. Additional backers include KfW Capital, Germany’s federal innovation agency Sprind, and Burda Principal Investments. Proxima described RWE and Google as strategic partners whose investments align with long-term plans to develop reliable, low-carbon baseload power from fusion.
Alpha Demonstration Reactor and Funding Plan
Proxima has outlined plans to build the Alpha demonstration reactor in Garching at an estimated cost of €2 billion, with the company and the Free State of Bavaria each expected to contribute €400 million. The remaining €1.2 billion is anticipated to come from the federal government, according to Proxima’s published plans. Company leaders say Alpha is intended to bridge decades of fusion research and demonstrate a commercially scalable step toward utility-scale fusion power.
Manufacturing and Gundremmingen Project
Alongside the Alpha plans, Proxima is constructing a factory in Gundremmingen to produce large superconducting magnets, each about five metres in diameter, that are central to its stellarator design. The company also intends to work with RWE to site the world’s first commercially usable stellarator-based power plant on RWE’s Gundremmingen site in the mid-2030s. Executives present the factory and site partnership as critical elements of a vertical industrial strategy to scale up from prototype components to full power plant construction.
Technology Choices and Competitive Landscape
Proxima pursues a stellarator approach based on magnetic confinement, contrasting with other European start-ups that favour high-power laser systems. Competitors such as Focused Energy — which secured $240 million in new capital at the end of May — and Marvel Fusion in Munich are developing laser-driven fusion concepts. Industry observers say it remains uncertain which approach will reach commercial viability first, but the diversity of technical routes has drawn significant private and public capital into the field.
Timeline, Risks and Industry Expectations
Proxima projects the Alpha reactor to be completed in the early 2030s, with a commercially usable fusion power plant potentially following in the mid-2030s at Gundremmingen, while independent experts generally estimate fusion energy may not reach commercial deployment before the 2040s. Fusion technology is widely regarded as promising because it produces far less long-lived radioactive waste than fission and could offer abundant, low-carbon power, but it remains technically challenging and capital-intensive. Proxima’s leadership stresses speed and scalability as competitive differentiators while acknowledging persistent engineering and regulatory hurdles.
Proxima was founded in 2023 and employs roughly 200 staff, and company representatives said the new capital will accelerate engineering, manufacturing and regulatory work across its European sites. The round signals strong investor appetite for large-scale climate and energy technologies, and it sets a new benchmark for private financing in the continent’s fusion sector.
Longer term, Proxima’s success will hinge on achieving repeated experimental milestones, delivering industrial-grade components from its Gundremmingen facility, and securing the remaining public financing for Alpha; if those steps proceed as planned, the company aims to move fusion energy closer to commercial reality within the next two decades.
