Otrera
Otrera is a French deeptech company developing fourth-generation modular Sodium Fast Reactors that cogenerate electricity and heat. Founded in 2024 as a CEA spin-off, it serves industrial sites, urban heating networks, data centers, and hydrogen producers seeking low-carbon, sovereign energy.
- Company typePrivate
- Founded2024
- HeadquartersAix-en-provence, France
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Otrera does
Otrera is a French deeptech company, spun out of the CEA in 2023 and incorporated in April 2024, headquartered at the Technopôle de l'Arbois cleantech campus in Aix-en-Provence. The company designs fourth-generation Sodium Fast Reactors (SFRs) in a hyper-modular, compact loop-type architecture — six standardized 50 MWth modules producing a 110 MWe / 180–185 MWth cogeneration package (the OTRERA 110) with approximately ten years of operation between refuelings, deployable on under five hectares and constructible in roughly three years. The technology inherits 50 years of French sodium reactor research from the Phénix, Superphénix, and Astrid programs and is differentiated by non-pressurized inert-atmosphere operation, four containment barriers, passive safety systems, in-vessel fuel cooling across three alternating vessels, and a sodium-gas heat exchanger that removes sodium-water and sodium-air reaction risks. The reactor is designed to be compatible with MOX fuel from stored spent assemblies as well as HALEU UO2 for export markets, enabling a closed fuel cycle.
Otrera's commercial model is B2B enterprise sales of reactors, technology licensing, and associated fuel-cycle services to large industrial sites, urban district-heating operators, data centers, hydrogen and e-fuel producers, CO2 capture installations, coastal desalination plants, port and industrial zones, transitioning territories, and electrical grid operators. The company has no disclosed paying customers or revenue to date and positions itself as reactor designer and system architect, with component fabrication, manufacturing, and engineering executed through a consortium of industrial partners (Groupe ADF, REEL/CNIM, SNEF/Ekium, Ingerop, NGE, Onet Technologies, Framatome) formalized through the Club Synergia collaborative framework and the Orano-led MOX RNR working group. Distribution is direct enterprise field sales with strategic engineering, manufacturing, and regulatory partnerships; pricing is not publicly disclosed and would be negotiated per project.
As of late 2025, Otrera employs more than 30 collaborators, has secured a total of €19.5 million across a €2.5M seed round (December 2024) and a €17M Series A (May 2026, comprising equity and France 2030 grants), and is building an industrial plant and technology hub in Cherbourg-en-Cotentin (Les Pieux) backed by a planned additional €40M+ raise by end-2026. Key shareholders include CEA, Groupe EDF, Groupe ADF, REEL, SNEF/Ekium, Ingerop, Onet Technologies, Normandie Participations, Fortil, and Isospin Exergon. Leadership is founder-led by Frédéric Varaine (former Astrid program leader at CEA) as Founder & CEO, with Jean-Éric Lucas as Co-founder COO/CFO, Rémy Dupraz as CTO, and Fabrice Mazaudier as Deputy CTO/CISO responsible for core, fuel, and cycle. The company targets first-unit commissioning by 2032 and has signed an MoU with Japan's JAEA to exchange loop-type SFR knowledge, signaling international ambitions.
Otrera firmographics
Firmographics- Name
- Otrera
- Legal name
- OTRERA NEW ENERGY
- Website
- https://otrera.fr
- Company type
- Private
- Founded year
- 2024
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Otrera is a French deeptech company developing fourth-generation modular Sodium Fast Reactors that cogenerate electricity and heat. Founded in 2024 as a CEA spin-off, it serves industrial sites, urban heating networks, data centers, and hydrogen producers seeking low-carbon, sovereign energy.
- Ownership category
- akta.pro rank
Otrera industry classification
Industry- Product category
- Small Modular Nuclear Reactors
- NAICS
- Nuclear Electric Power Generation (221113)
- SIC
- Cogeneration Services & Small Power Producers (4991), Electric, Gas & Sanitary Services (4900)
- akta.pro primary industry
- Gen IV / Advanced Reactor Systems (SFR, LFR, GFR, MSR, HTGR, Microreactors) (EUAKADAC)
- akta.pro secondary industries
- Fast Neutron Reactor (SFR/LFR) Power Generation (EUACADAE), Advanced & Non‑LWR Fuel Manufacturing (TRISO, metallic fuels, HALEU fuels) (EUAKACAG), Reactor Protection, Safety Systems & Engineered Safeguards (ECCS, Containment Isolation) (EUAKADAI), Containment, Civil Structures & Modular Construction Systems (EUAKADAJ)
Keywords
Where Otrera is headquartered
LocationHeadquarters
- HQ city
- Aix-en-provence
- HQ country
- France
- HQ region
- Europe
Offices2 records
Markets served
Otrera business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Personnel, Infrastructure, Supply Chain, Operations, Marketing or Sales
Revenue model
- Nuclear Reactor Sales and Licensing: Otrera designs and plans to manufacture and sell fourth-generation sodium fast reactors. Revenue will be generated through the sale of reactors, potentially including licensing of technology and associated fuel cycle services. The company positions itself as reactor designer and system architect with an integrated approach covering reactor, fuel, and cycle.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels6 records
Otrera product offering
Product offeringCore offering
Otrera designs and plans to manufacture compact, modular fourth-generation sodium-cooled fast neutron reactors (SFRs) for cogeneration of electricity (110 MWe) and industrial heat (180-185 MWth), with 10-year refueling autonomy and closed fuel cycle. The reactors target decarbonization, energy sovereignty, and reindustrialization for industrial sites, urban heating networks, data centers, hydrogen and e-fuels producers, desalination plants, and grid operators.
Product overview
Otrera offers a portfolio of nuclear energy solutions centered on its fourth-generation Sodium Fast Reactor (SFR) technology. The core product is the Otrera modular reactor (OTRERA 20 to OTRERA 200 range), delivering 110 MWe electricity plus 180-185 MWth cogenerated heat with 10-year fuel autonomy. Complementing the reactor is a Nuclear Materials Management Simulator for fuel cycle scenario planning, and Club Synergia—a collaborative ecosystem initiative uniting industrial partners around the development program. The company is spin-off from CEA, founded in 2024, developing reactors designed for MOX fuel recycling and closed fuel cycle operations.
Differentiator
Problem solved
Functional benefit
Products and services
- OTRERA Sodium Fast Reactor (SFR)
Quantifiable outcome
- 110 MWe + 180-185 MWth cogeneration output per unit
- +4 more outcomes
Companies that use Otrera
Customer profileSegments8 records
Ideal customer profiles4 records
Otrera technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability2 records
Feature8 records
Otrera partnerships and signals
Strategic signalPartnerships
16 partnerships are on record, tiered core and supporting.
- Groupe ADFcoreGroupe ADF participated in the €17 million funding round and partners on industrialization of the primary vessel for the reactor. ADF contributes manufacturing expertise for critical reactor components.
- IngeropcoreIngerop joined the €17 million round and partners on regulatory engineering and design. Contributes engineering consultancy expertise for nuclear regulatory compliance.
- Onet TechnologiescoreOnet Technologies joined the €17 million round and partners on instrumentation, maintenance, and operability for the reactor systems. Contributes nuclear services expertise.
- Groupe REELcoreGroupe REEL joined the €17 million round and partners with CNIM Systèmes Industriels on nuclear design and manufacturing of reactor components.
- SNEF / EkiumcoreSNEF/Ekium joined the €17 million round and partners on techno-economic modeling for reactor development. Contributes engineering and industrial expertise.
- Japan Atomic Energy Agency (JAEA)coreMoU signed September 30, 2025 (formalized November 5, 2025) for exchange of knowledge on loop-type sodium-cooled fast nuclear reactors. JAEA contributes operational experience from the JOYO reactor in Ibaraki Prefecture, Japan.
- OranocoreOtrera joined the 'MOX RNR' working group initiated by Orano, bringing together advanced nuclear sector players to redesign industrial schema for MOX fuel relative to fast neutron reactors. Orano is a key actor in nuclear fuel cycle.
- CEA (Commissariat à l'énergie atomique)coreCEA is the original parent organization from which Otrera spun off. CEA holds an equity stake and provides access to 50 years of fast reactor research, technical expertise, and nuclear industry relationships.
- Nuclear ValleysupportingOtrera is a member of Nuclear Valley, the French nuclear industry competitiveness cluster, providing ecosystem connections and industry collaboration.
- GIFENsupportingOtrera is a member of GIFEN (Groupement des Industries Françaises de l'Energie Nucléaire), the French nuclear energy industry association.
- La French TechsupportingOtrera is recognized as part of the La French Tech ecosystem, supporting French tech and innovation companies.
- CapenergiessupportingOtrera is associated with Capenergies, the competitiveness cluster for energy transition in the Provence-Alpes-Côte d'Azur region.
- FramatomesupportingFramatome is listed as a collaboration partner, bringing nuclear reactor design and components expertise to the Otrera ecosystem.
- ApavesupportingApave partners on integration of safety requirements for the reactor development, contributing nuclear safety consultancy.
- NEEXTsupportingNEEXT contributes to energy conversion cycle architecture for the reactor, providing specialized engineering for the conversion systems.
- Club Synergia MemberscoreClub Synergia founding members include: Reel CNIM Systèmes Industriels, SNEF EKIUM, Groupe ADF, Ingérop, NGE, and Onet Technologies. This collaborative framework accelerates industrial development and commercial deployment.
Scale indicators6 records
Recent moves9 records
Expansion highlights7 records
Otrera competitors and assessment
Company assessmentMarket position
Strengths5 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Otrera social profiles
Digital presenceOtrera compliance and trust
Trust signalCompliance2 records
Otrera financial estimates
Financial estimateRevenue estimate
Valuation estimate
Otrera leadership team
Management profileNumber of profiles
Profiles8 records
Otrera funding detail
Funding detailFunding overview
Funding rounds3 records
Investors13 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Otrera M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Otrera
What does Otrera do?
Otrera designs and plans to manufacture compact, modular fourth-generation sodium-cooled fast neutron reactors (SFRs) for cogeneration of electricity (110 MWe) and industrial heat (180-185 MWth), with 10-year refueling autonomy and closed fuel cycle. The reactors target decarbonization, energy sovereignty, and reindustrialization for industrial sites, urban heating networks, data centers, hydrogen and e-fuels producers, desalination plants, and grid operators.
Is Otrera a public or private company?
Otrera is a private company. It is classified as venture growth investor backed and is currently operating.
When was Otrera founded?
Otrera was founded in 2024. It employs 11 to 50 people.
Where is Otrera based?
Otrera is headquartered in Aix-en-provence, France, in the Europe region.
How does Otrera make money?
One revenue line is on record: nuclear Reactor Sales and Licensing.
Does Otrera have an API?
No public API is recorded for Otrera.
What industry is Otrera in?
Otrera's product category is Small Modular Nuclear Reactors. Its primary akta.pro industry code is EUAKADAC, Gen IV / Advanced Reactor Systems (SFR, LFR, GFR, MSR, HTGR, Microreactors), with a secondary code of EUACADAE, Fast Neutron Reactor (SFR/LFR) Power Generation. Its NAICS code is 221113 and its SIC code is 4991.