Best Nuclear Energy Companies in France
The 40 best Nuclear Energy companies in France in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Newcleo.
Ranked: Best Nuclear Energy companies in France
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Newcleo 🦄 Provider of advanced nuclear energy technologies, focused on designing, building, and operating small modular… | $685M | 7 mo ago | Series B | Luciano Cinotti Co-Founder & CSO | 2021 | ContentfulJavaYouTube+10 | 7 patents Advanced modular nuclear reactor core designs with integrated safety and control systems | 1 partnership |
| 2 | NAAREA Developer of nuclear energy project | $66M | 33 mo ago | Series C | Ivan Gavriloff Co-Founder | 2021 | BugHerdNode.jsThree.js+13 | 25 patents Molten-salt nuclear fuel processing and actinide composition monitoring for MSR reactors | — |
| 3 | HEXANA Developer of modular, flexible fourth-generation nuclear reactor and thermal storage systems | $27M | 19 mo ago | Series B | Sylvain Nizou Co-Founder & CEO | 2023 | WordPressMySQLPHP+15 | — | 1 partnership |
| 4 | Jimmy Operator of thermal generators providing decarbonized heat to industrial clients | $17M | 46 mo ago | Series A | — | 2021 | WebflowSwipercore-js+13 | 6 patents Advanced electret and nanofiber nonwovens for high‑efficiency filtration and functional textiles | 1 job opening |
| 5 | Renaissance Fusion Manufacturer of magnetic confinement fusion | $16M | 18 mo ago | Series A | Francesco Volpe Founder | 2020 | Cart FunctionalitySquarespace CommerceSquarespace+17 | 45 patents Patents concentrated in computing, sensing & instrumentation | 1 award |
| 6 | Framatome Designer, manufacturer, and supplier of nuclear steam supply systems & nuclear equipment | — | 11 mo ago | Funding Raised | Bernard Fontana CEO | 1958 | Cart FunctionalityProgress SitefinityApple iCloud Mail+13 | 815 patents Nuclear reactor operation, fuel handling, inspection, and control system monitoring equipment | 2 job openings |
| 7 | BERNARD CONTROLS Provider of storage, extraction, and transportation services for water, oil & gas industries | — | 63 mo ago | Funding Raised | Etienne Bernard CEO | 1936 | Apple iCloud MailVarnishPlatform.sh+5 | 82 patents Modular mechanical power transmission gearboxes and reducers for industrial equipment. | — |
| 8 | aeib fans AEIB Fans specializes in the design and production of industrial fans and ventilation devices. | — | — | Acquired | — | 1969 | WordPressMySQLPHP+13 | — | — |
Top 7 Nuclear Energy companies in France
#1
Newcleo 🦄Series B · Paris, Ile de France · founded 2021 · 430 employees$684.8Mraised▾
Provider of advanced nuclear energy technologies, focused on designing, building, and operating small modular lead-cooled fast reactors. The company focuses on small modular reactors that recycle nuclear waste into fuel, closing the fuel cycle for sustainable power. The reactors use liquid lead cooling and fast neutron flux to avoid long-lived radioactive waste like plutonium and reduce the need for geological storage.
- Feb 2026Series B$85M
- Sep 2024Series B$151M
- May 2024Series B$109.4M
- Mar 2023Series B—
#2
Series B · Aix-en-Provence, Provence-Alpes-Cote d'Azur · founded 2023$27.1Mraised▾
Developer of modular, flexible fourth-generation nuclear reactor and thermal storage systems. It designs an energy platform combining fast neutron sodium-cooled modular nuclear reactors with a thermal storage system. The technology offers high-temperature heat and decarbonized electricity production, along with the capacity for high-temperature heat storage, which can be converted into electricity. This approach aims to stabilize the electrical grid and provide a flexible energy solution. It also focuses on revalorizing used nuclear fuels to reduce dependence on imported uranium and support the production of synthetic fuels, enhancing energy sovereignty.
- Jan 2025Grant (prize money)$10.8M
- Jan 2025Series B$16.3M
#3
Series A · Fontaine, Auvergne Rhone Alpes · founded 2020 · 23 employees$16.4Mraised▾
Manufacturer of magnetic confinement fusion
- Mar 2025Series A$34.3M
- Jan 2023Seed$16.4M
- 2022Seed—
- 2021Seed—
#4
Series C · Paris, Ile de France · founded 2021 · 140 employees$65.8Mraised▾
Developer of nuclear energy project
- Nov 2023Series C$65.8M
#5
Series A · Levallois Perret, Ile de France · founded 2021 · 36 employees$17.3Mraised▾
Operator of thermal generators providing decarbonized heat to industrial clients. The company designs, installs, operates, and dismantles thermal generators. These generators utilize high-temperature reactor technology to supply heat. The generators offer a competitive and secure heat source.
- Oct 2022Series A$14.8M
- Feb 2022Seed$2.5M
#6
Funding Raised · La Defense, Ile de France · founded 1958 · 2046 employees—raised▾
Designer, manufacturer, and supplier of nuclear steam supply systems & nuclear equipment. The company designs, services and installs components, fuel, and instrumentation and control systems for nuclear power plants
#7
Funding Raised · Gonesse, Ile de France · founded 1936 · 500 employees—raised▾
Designer and manufacturer of electric actuators intended to serve power, water, Industry and oil and gas markets. The company's automation of industrial machinery and equipment addresses human and financial challenges of security and productivity, enabling customers to receive industrial valves and dampers to carry out their functions smoothly.
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Nuclear Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Nuclear / Small Modular Reactors is moving in France
A read on the academic research around Nuclear / Small Modular Reactors — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 337 France-affiliated papers.
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives153
- CEA Cadarache84
- Centre National de la Recherche Scientifique59
- CEA Paris-Saclay38
- École Polytechnique Fédérale de Lausanne27
- Nuclear reactor1→15
- Neutron1→9
- Research reactor1→7
- Neutrino1→5
- Nuclear reactor9→14
- Research reactor3→7
- TRIGA3→7
- Thermal1→5
- Molten salt6→9
- Nuclear power4→10
- Nuclear power plant1→6
- Neutrino1→6
- Nuclear reactor6→10
- Context (archaeology)3→7
Where nuclear smr is researched across France
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing nuclear smr patents in France
France nuclear smr patent filing is cooling — 2,310 filings from 857 assignees (2016–2025), led by Commissariat Energie Atomique, Areva NP, Framatome; annual filings 285→224.
- Commissariat Energie Atomique1437
- Areva NP1066
- Framatome540
- Electricite DE France391
- Areva NC253
- DCNS112
- SOC Technique POUR Lenergie Atom112
- TN INT110
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.