Proxima Fusion
Pre-revenue venture-funded hardware developer: build the Alpha net-energy demonstrator (Garching, targeted ~2031 / early 2030s), then the Stellaris commercial plant (Gundremmingen site, company target: in the 2030s); long-term model is power plant sales/licensing plus electricity offtake with utility partners
Only the July 2026 round's EUR 2.4B post-money valuation is officially disclosed (Business Wire / Bloomberg / CNBC). Pre-seed, seed, and Series A valuations were never published; those points are order-of-magnitude implied estimates from round size and typical dilution, included solely to shape the trail. Round sizes, dates, and leads are all verified disclosed facts.
Earnings, margins, COGS & capex
Proxima Fusion is a private, pre-revenue fusion developer. Cumulative capital secured exceeds EUR 650M ($740M) in about three years: EUR 7.5M pre-seed (2023; Plural, UVC Partners, Visionaries Club, Wilbe, HTGF and others), EUR 20M seed (2024, led by redalpine), EUR 130M Series A (June 2025, co-led by Cherry Ventures and Balderton - then Europe's largest private fusion round, with UVC Partners, DeepTech & Climate Fonds, Plural, Leitmotif, Lightspeed, Bayern Kapital, HTGF, Club degli Investitori, OMNES Capital, Elaia, Visionaries Tomorrow, Wilbe, redalpine participating), EUR 15M Series A extension (Sept 2025), and EUR 411M ($468M) announced July 7, 2026 at a EUR 2.4B post-money valuation, led by XTX Ventures and East X Ventures with RWE (EUR 25M per RWE) and Google as strategic investors, plus KfW Capital, SPRIND and Burda Principal Investments and 14 returning investors (incl Plural, Balderton, Cherry, Lightspeed, redalpine, Bayern Kapital, EIC Fund). Separately ~EUR 95M in public grants (EU and German programs incl the EIC). No revenue, margin, or burn figures are disclosed.
Revenue trend
Margins
n/a
Burn rising as hardware programs scale
COGS structure
No COGS (no product sales). Dominant input costs: HTS superconducting tape (supply agreement with Faraday Factory Japan, June 2025), precision coil winding and cryogenics, HPC/AI simulation compute, and specialist plasma-physics/engineering talent across Munich (HQ), Zurich, and Oxford.
Capex
The business IS capex: Stellarator Model Coil (SMC) demo magnet targeted 2027, HTS cable and magnet production capacity, then the ~EUR 2B Alpha demonstrator in Garching (framework MoU with Bavaria/RWE/Max Planck IPP signed Feb 26, 2026; Proxima ~20% private financing, Bavaria indicated ~20% state contribution), and ultimately the Stellaris plant at the decommissioned Gundremmingen nuclear site. Multi-billion-euro cumulative requirement to first commercial plant.
Latest earnings
n/a
Company roadmap (not financial guidance): complete the Stellarator Model Coil demo magnet (~2027), Alpha net-energy demonstration targeted ~2031 / early 2030s, Stellaris commercial plant in the 2030s - fusion timelines have historically slipped industry-wide
- Post-money valuation
- EUR 2.4B (~$2.7B), July 2026
- Latest round
- EUR 411M ($468M), announced 2026-07-07, led by XTX Ventures and East X Ventures
- Total secured since 2023
- >EUR 650M incl ~EUR 95M public grants
- Strategic investors
- Google (Alphabet), RWE (EUR 25M), plus KfW Capital, SPRIND, Burda Principal Investments
- Founded
- April 2023, Max Planck IPP spin-off, Munich
- Headcount
- ~200 (July 2026 company disclosure); offices in Munich, Zurich, Oxford
Growth drivers
- Alpha demonstrator — first net fusion energy in a continuous-operation-capable stellarator, targeted ~2031 (July 2026 company language: 'early 2030s')
- Stellaris: first peer-reviewed integrated stellarator power plant concept (Fusion Engineering and Design, Feb 2025); company targets a grid-connected commercial plant in the 2030s
- Feb 2026 MoU with the Free State of Bavaria, RWE, and Max Planck IPP - promised public funding was conditioned on securing private investment, a condition the July 2026 round fulfills
- HTS magnet supply chain build-out (Faraday Factory Japan tape agreement, June 2025; Paul Scherrer Institute magnet partnership since June 2024)
- AI/HPC-driven stellarator optimization leveraging Wendelstein 7-X experimental heritage
- Hyperscaler and utility demand for firm clean power (Google as strategic investor; RWE as utility partner and plausible offtaker)
Bull & bear
Proxima is the only credible commercial heir to Wendelstein 7-X, the one fusion lineage that has already demonstrated the physics of continuous, disruption-free confinement - and stellarators' steady-state operation is what a power plant actually needs. With a EUR 2.4B valuation, Google and RWE on the cap table, Bavaria and the federal ecosystem co-funding via the Feb 2026 MoU, and a licensed-site pathway at Gundremmingen, it is the European fusion champion with a defensible physics moat and a state tailwind.
- QI stellarator = steady-state by construction: no disruptions, no pulsed duty cycle - the failure modes that most threaten tokamak plant economics simply do not exist in this architecture
- W7-X heritage de-risks the physics: Proxima extrapolates from the best-performing stellarator ever built, with IPP as a signed MoU partner, not just an alumni network
- Capital formation is compounding: EUR 7.5M to EUR 411M rounds in three years; XTX Ventures, Google, RWE, KfW Capital, SPRIND validate across finance, tech, utility, and state axes
- Siting advantage is real and unusual: Alpha next to IPP Garching, Stellaris at a decommissioned RWE nuclear plant with grid connection - years of permitting and interconnect time saved
- State co-funding is contractually framed: the Feb 2026 MoU conditioned public money on private investment, and the July 2026 round met that condition; Bavaria has indicated a ~20% contribution to the ~EUR 2B Alpha project
- AI-native design stack (stellarator optimization was computationally intractable until recently) means Proxima's iteration speed rises with compute - and investor Google supplies the frontier of that compute
Proxima is a EUR 2.4B valuation on zero revenue, zero integrated hardware, and a first-net-energy target of ~2031 - roughly four years behind CFS with a fraction of the capital. Stellarator coils are among the hardest objects in applied superconductivity to manufacture at tolerance, the HTS supply chain is a shared bottleneck, and the company must raise billions more across a decade in which any physics disappointment, competitor breakthrough, or funding winter could be terminal.
- Nothing is built: the flagship near-term deliverable is a single demo magnet (targeted 2027); net energy (~2031) and commercial power (2030s, per company) are targets separated from today by every hard problem in fusion engineering - and fusion timelines have historically slipped industry-wide
- Stellarator manufacturing risk is among the worst in the field: complex 3D non-planar HTS coils at millimeter tolerances have never been produced at scale by anyone; W7-X's own coils caused years of delay and cost overrun
- CFS race risk: if SPARC demonstrates Q>1 in 2027 as targeted, capital and offtake gravity shifts decisively to the tokamak path and to the US; Proxima's differentiation becomes a second-place story
- Funding treadmill: >EUR 650M secured is a small fraction of cost-to-first-plant (Alpha alone ~EUR 2B, of which Proxima covers ~20% privately); each future round is exposed to fusion sentiment, European deep-tech capital depth (historically thinner than US), and milestone slippage
- HTS tape supply concentration (Faraday Factory Japan for the demo magnet) amid a global tape squeeze; a supply or price shock directly gates the magnet program
- No revenue model until the mid-to-late 2030s at the earliest even on the company's own plan, and fusion LCOE vs 2030s-2040s solar+storage+SMR economics is unproven - technical success may not equal commercial success
- Valuation supported only by round pricing: EUR 2.4B embeds venture-style success probabilities that public-market investors may never underwrite if the exit window requires an IPO before net energy
What it is worth
Last priced round (primary); cross-checked against private fusion comps. No DCF possible pre-revenue - value is a real-option on technical milestones.
Sub-$1B or down-round/washout if coil manufacturing slips materially, HTS supply tightens, a rival's net-energy win redirects capital, or European growth funding thins; terminal risk is real - pre-revenue hardware companies can go to zero
~$2.7B (July 2026 round mark) grinding higher with milestone-driven up-rounds; next raise plausibly 2027-28 against SMC completion and Alpha progress (timing not disclosed - inference, not guidance)
$6-10B+ within 2-3 years
if the Stellarator Model Coil validates on schedule (~2027), Alpha construction starts at Garching, and German fusion-specific regulation lands - re-rating toward CFS/Helion territory with European-champion scarcity premium; far higher on a successful net-energy demonstration
EUR 2.4B (~$2.7B) post-money set by the EUR 411M round announced 2026-07-07. Comps: CFS has raised ~$3B with a nearer-term net-energy shot (valuation not officially disclosed, reported materially higher); Helion was valued ~$5B+ at its January 2025 round with a signed Microsoft PPA. Proxima prices below both, consistent with its earlier hardware stage, and above all other disclosed European fusion players. Valuation is round-supported, not cash-flow-supported; vintage 2026-07.
SWOT
Strengths
- Direct lineage from Max Planck IPP and the Wendelstein 7-X stellarator - the world's most advanced stellarator experiment - with a formal institutional partnership (Feb 2026 MoU) no US rival can replicate
- Stellarator physics advantage — intrinsically steady-state, disruption-free operation vs tokamaks' pulsed operation and disruption risk
- Best-funded fusion company in Europe (EUR 2.4B post-money, >EUR 650M secured) with deep-pocketed strategic backers (Google, RWE) and state alignment (Bavaria MoU, KfW Capital, SPRIND, EIC)
- Stellaris is the first peer-reviewed integrated stellarator power plant concept, published in Fusion Engineering and Design (Feb 2025)
- Sited path to commercialization — Alpha at Garching next to IPP, Stellaris at the decommissioned RWE Gundremmingen nuclear site with existing grid connection
Weaknesses
- Pre-revenue with zero product sales; every euro of value rests on future technical milestones
- No integrated device built yet — the near-term deliverable is a demo magnet (Stellarator Model Coil, targeted 2027); net energy is a ~2031 target, not a result
- Stellarator coils are among the hardest magnets in fusion to design and manufacture (complex 3D non-planar geometries) - manufacturing risk exceeds tokamak peers
- HTS tape supply concentration (Faraday Factory Japan agreement for the demo magnet) in a market where CFS and others compete for the same tape
- Roughly 4 years behind Commonwealth Fusion Systems on the demonstrate-net-energy clock (SPARC Q>1 targeted 2027 vs Alpha ~2031), at a fraction of CFS's cumulative funding
Opportunities
- European energy sovereignty push post-2022 — EU and Germany actively seeking a home-grown fusion champion; German fusion funding programs favor Proxima
- Repurposing decommissioned German nuclear sites (Gundremmingen) — grid interconnects, cooling, and licensed-site heritage lower plant-siting cost
- Hyperscaler firm-clean-power procurement wave (Google already an investor; the Microsoft-Helion PPA set precedent)
- If tokamaks stumble on disruptions/pulsed-operation economics, QI stellarators become the default magnetic-confinement path and Proxima is its clear leader
- Potential regulatory tailwind — Germany moving toward fusion-specific regulation outside nuclear-fission law, which would materially de-risk licensing
Threats
- Commonwealth Fusion Systems (SPARC first plasma 2026-27, Q>1 targeted 2027; ARC plant in Virginia early 2030s) could win the race and capture capital, talent, and offtake mindshare
- Fundamental physics/engineering risk — no fusion device has ever produced net electricity; QI stellarator performance at reactor scale is extrapolated from W7-X, not demonstrated
- Capital-markets dependence — needs multi-billion further funding before revenue; a fusion-sector sentiment reversal or a high-profile competitor failure could shut the window
- HTS tape supply crunch as CFS, Tokamak Energy, Type One, Thea and grid/magnet applications all scale simultaneously
- Talent war with better-capitalized US rivals — state-backed fusion programs elsewhere (US public-private, Chinese national programs) accelerating on faster state timelines (competitive context only)
Moats, dependencies & bottlenecks
Moats
decades of German state investment in W7-X (construction cost ~EUR 1B+) is effectively Proxima's subsidized R&D base; not replicable by new entrants IPP is a formal MoU partner (Feb 26, 2026), not just a talent source
Stellaris is the first peer-reviewed integrated stellarator plant concept; optimization know-how compounds, but Type One Energy and Thea Energy pursue adjacent stellarator paths Physics moat is real but shared with a small cohort
KfW Capital, SPRIND, EIC) Moderate-Strong political tailwinds can shift, but European fusion-champion status is sticky once public capital is committed MoU public funding was explicitly conditioned on private investment; the July 2026 round met that condition
Garching (Alpha) + decommissioned Gundremmingen nuclear site (Stellaris) grid interconnect and licensed-site heritage save years, but the advantage is Germany-specific
small global pool of stellarator experts, many within Proxima's IPP orbit ~200 staff (July 2026), offices in Munich, Zurich, Oxford
Dependencies
June 2025 agreement to supply HTS tape for the Stellarator Model Coil demo magnet; global HTS tape demand from CFS, Tokamak Energy, and grid applications is surging
Research partner / physics base W7-X data, siting adjacency at Garching, and credibility all flow through IPP; MoU signatory
SPRIND, EIC, Bavaria MoU) Capital + regulatory Bavaria indicated ~20% contribution to Alpha; public money is milestone- and politics-dependent; fusion-specific regulation still in progress
Strategic investor / utility partner / site owner RWE invested EUR 25M in the July 2026 round, owns the Gundremmingen site, and is the most likely first utility partner; partner priorities could shift
Magnet development partner HTS magnet development and testing partnership since June 2024
Multi-billion further raises required before any revenue; sentiment-exposed
Stellarator optimization is compute-bound; Google is now a strategic investor
Advantages
- Only major commercial player on the QI stellarator path with direct W7-X heritage - steady-state, disruption-free physics
- Best-funded fusion company in Europe (EUR 2.4B post-money, July 2026) with Google + RWE strategic backing
- First peer-reviewed integrated stellarator power plant concept (Stellaris, Fusion Engineering and Design, Feb 2025)
- Sited pathway: Alpha at Garching, commercial plant at the decommissioned Gundremmingen nuclear site
- State-aligned capital stack (KfW Capital, SPRIND, EIC, Bavaria) lowering effective cost of capital
- AI-era tailwind: stellarator optimization improves directly with compute availability
Weaknesses
- Pre-revenue, pre-prototype: no integrated fusion device yet built
- Net energy targeted ~2031 / early 2030s - behind CFS's SPARC timeline (Q>1 targeted 2027)
- Hardest-in-class magnet manufacturing risk
- HTS tape supply concentration (Faraday Factory Japan)
- Multi-billion remaining funding gap to first plant
- Exit path unclear: an IPO before net energy would test public-market appetite for pure-play fusion
Bottlenecks
- Manufacturing complex 3D non-planar HTS coils at required tolerances and yield - the single hardest engineering step
- HTS tape supply volume and price against competing global demand
- Stellarator Model Coil completion and validation (demo magnet targeted 2027) - gates the entire Alpha schedule
- Fusion-specific licensing/regulatory framework in Germany (not yet finalized)
- Cumulative capital requirement to first plant (Alpha alone ~EUR 2B; multi-billion EUR total) vs European deep-tech funding depth
- Tritium fuel-cycle and blanket engineering - unsolved industry-wide, deferred to later stages
Top signals & trends
Top signals
Largest European fusion raise on record; strategic (not just financial) capital; RWE's own ticket was EUR 25M
State co-commitment de-risks siting and part of the ~EUR 2B Alpha capital stack (Bavaria indicated ~20%)
Scientific credibility marker rare among fusion startups
Hardware maturity lags valuation narrative
A rival's success reprices the field's leaders and laggards asymmetrically
A regulatory framework outside fission law would be a material de-risk
Trends
Google invested here and in CFS/TAE; the Microsoft-Helion PPA set precedent
Germany explicitly backing a national fusion champion; SPRIND/KfW/EIC engaged
Rising tide, but capital concentrates in perceived leaders
More supply coming (Faraday Factory ~10x output since 2020; Fujikura, MetOx expansions) but demand growing faster near-term
Disproportionately benefits stellarators, whose historical weakness was design intractability
Oklo (OKLO), NuScale (SMR) offer nearer-term firm power to the same buyers
Ecosystem & competitor graph
Suppliers feed the company; customers pull from it. Line thickness shows the strength of each tie (supply-chain dependency, customer earnings contribution). Hover to isolate a tie.
HTS tape supplier under a June 2025 agreement - critical enabling material for the Stellarator Model Coil demo magnet
Major alternative HTS tape producer
HTS tape supplier via SuperPower subsidiary
US HTS tape scale-up, potential second source
GPU compute underpinning stellarator optimization and plasma simulation toolchains (category exposure)
Industrial gases / cryogenics class supplier for HTS magnet cooling (category exposure, no disclosed contract)
Strategic investor (EUR 25M), MoU partner, Gundremmingen site owner, and the most likely first utility offtaker/site host
Strategic investor; hyperscalers are the emerging first-buyer class for fusion power - no Proxima offtake disclosed
Prospective plant buyers from the 2030s (company target; fusion timelines commonly slip); no offtake contracts disclosed as of 2026-07
MIT spin-off, HTS tokamak; SPARC ~75% built with first plasma 2026-27 and Q>1 targeted 2027, ARC plant in Virginia early 2030s; ~$3B raised incl Google and NVIDIA - the global funding and timeline leader
Field-reversed configuration, direct electricity capture; Microsoft PPA (2028 target); ~$5B+ valuation (Jan 2025 round), Sam Altman-backed
US stellarator company (W7-X alumni); Infinity One program with TVA - Proxima's closest architectural rival
Princeton-lineage planar-coil stellarator - attacks Proxima's hardest problem (coil complexity) with a simplified magnet architecture
Field-reversed configuration, ~$1.3B+ raised, Google-partnered on ML optimization
UK spherical tokamak + merchant HTS magnet business
Fellow Munich company, laser inertial fusion - competes for German talent and state funding
Sheared-flow Z-pinch, magnet-free low-capex approach
Canadian magnetized target fusion; 2025 funding difficulties illustrate the sector's downside case
Not fusion - advanced fission microreactors; competes for the same clean-firm-power offtake budget on a nearer timeline
Public SMR fission developer; substitute product for 2030s firm clean power