Funding rounds
Announced	Stage	Amount	Valuation	Lead investors	Other investors	Confidence
May 21, 2026	Undisclosed	~$19.8M	—	—	Electricite de France (EDF), Exergon, Fortil, Groupe ADF, Ingerop, Normandie Participations, Onet Technologies, REEL Group, SNEF Group	Confirmed
Dec 5, 2024	Seed	~$2.6M	—	—	Axe Capitole, CEA Investissement, Ekium, Exergon, Fortil, Groupe ADF, NGE, REEL Group	Reported

Undisclosed
With Electricite de France (EDF), Exergon, Fortil, Groupe ADF, Ingerop, Normandie Participations, Onet Technologies, REEL Group, SNEF Group
Confirmed
~$19.8M
May 21, 2026
Seed
With Axe Capitole, CEA Investissement, Ekium, Exergon, Fortil, Groupe ADF, NGE, REEL Group
~$2.6M
Dec 5, 2024

Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.

Systems1

OTRERA 110

A nuclear reactor designed to provide electricity and heat.

Maturity not rated

Newest unveiled first. Open a system for its milestone timeline, components and sources.

Capabilities1

Capabilities
Technology	Role	Maturity	TRL	Notes	Confidence
Small modular reactors	Developer	Development	—	—	Reported

Small modular reactors
Developer
DevelopmentReported

Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.

People3

All 3 people →

Frédéric Varaine
Founder & CEO
Guillaume Tremblay
Chief Business Officer
Rémy Dupraz
Chief Technology Officer (CTO)

Sources10

Profile4

1
DatabaseOtrera - PitchBook company profile
PitchBook · Supports Organization · employee range, Organization · linkedin url, Organization · x url
“employee_range: 11-50 (profile: 45)”
2
DatabaseSixth-Domain public startups directory
Sixth-Domain · Supports Organization · country, Organization · kind
“{"country": "France", "hq_iso2": "FR", "id": "41a69f99-36ac-4f74-80b8-ec77e220e939"}”
3
DatabaseOtrera - Crunchbase company profile
Crunchbase · Supports Organization · employee range, Organization · hq city, Organization · linkedin url, Organization · x url
“employee_range: 11-50 (profile: 11-50)”
4
DatabaseOtrera - LinkedIn company profile
LinkedIn · Supports Organization · employee range, Organization · linkedin url
“employee_range: 11-50 (profile: 11-50 employees)”

Systems1

5
CompanyTechnologie et combustible | OTRERA - Redefine nuclear energy
Otrera · Supports System
“Le réacteur OTRERA 110 produit 110 MW d’électricité et 180 MW de chaleur à 100-150°C que l’on peut multiplier facilement en implantant plusieurs réacteurs et moduler pour s’adapter aux besoins.”

Technologies1

6
CompanyRéacteur nucléaire 4ème génération | Otrera - Redefine nuclear energy
Otrera · Supports Organization · description, Organization · name, Organization · website, Organization technology
“Otrera développe un réacteur nucléaire innovant de 4ème génération pour produire une énergie durable, bas carbone et compétitive.”

Funding3

7
CompanyOTRERA accelerates: €17M secured to advance its 4th-generation fast neutron reactor
Otrera · May 21, 2026 · Supports Funding round · amount
“OTRERA announces €17 million in funding, consisting of equity and grants from the France 2030 program.”
8
NewsOtrera boucle sa première levée de fonds de 2,5 millions
Gomet' · Dec 23, 2024 · Supports Funding round · amount, Organization · ownership
“a annoncé le 5 décembre dernier la clôture de son premier tour de levée de fonds, qui a permis de réunir 2,5 millions d’euros”
9
NewsFrench Nuclear Startup Otrera Completes €17 Million Funding Round For Generation IV Reactor
NucNet · Supports Funding round
“The funding round also includes shareholders such as Groupe ADF, Groupe EDF, Exergon Fund, Ingerop, Fortil Group, Normandie Participations, Onet Technologies, REEL Group, and SNEF Group.”

People1

10
CompanyOtrera - team page
Otrera · Supports Role
“Frédéric Varaine Founder & CEO”

Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.