Civil nuclear power is going through a global revival. Against this backdrop, a 40-person French startup has just achieved what few players manage to pull off: convincing EDF, Europe’s leading electricity utility, to come on board as a shareholder. Behind that signal lies a strong industrial conviction in a technology France has mastered for fifty years, but whose industrial development had been put on hold for lack of funding.
Analysis by the experts at Auris Finance, advisors in mergers, acquisitions and financial engineering.
Aix-based deeptech Otrera has closed a second round of 17 million euros, with EDF joining the round. The deal secures the FEED phase of its factory producing components for fourth-generation nuclear reactors in Cherbourg-en-Cotentin, due by 2028.
The financing, made up of equity and grants from the France 2030 programme, brings together a consortium of strategic shareholders: Groupe ADF, Groupe EDF, Isospin Exergon, Ingerop, Fortil Group, Normandie Participations, Onet Technologies, Groupe REEL and SNEF / Ekium.
Otrera, a CEA spin-off rethinking the nuclear reactor
Otrera is a spin-off of France’s Atomic Energy Commission (CEA), founded by Frédéric Varaine, former head of the CEA‘s Astrid programme. Its team comes from the Astrid, Phénix and Superphénix programmes, which means it carries most of France’s accumulated industrial know-how on fast neutron reactors, a technology the country has mastered since the 1970s but whose development had been suspended. The founders are not trying to replicate what was done before. That experience has allowed them to make different technological choices, precisely the ones that were missing to make the sector industrially viable.
What Otrera is developing differs from current nuclear plants on three fundamental points: far less long-lived radioactive waste, the ability to use spent fuel from other reactors, and better energy efficiency. Sodium cooling, rather than water, allows higher operating temperatures and therefore these performance gains. The Cherbourg plant will manufacture the most critical components: vessels, heat exchangers, electromagnetic pumps and rotating control rods. The Otrera-One demonstrator, rated at 200 MWth, is planned on a CEA site in Marcoule or Cadarache from 2032.
What the cap table reveals
What sets this deal apart is the make-up of the investor group. Otrera did not raise from generalist financial funds. The company has built a 100% French consortium of nine strategic shareholders, combining nuclear industry players, regional funds and a national energy operator.
EDF‘s entry into the capital is the strongest signal. Europe’s leading electricity utility is taking a stake in this type of technology for the first time in several years. Its chief technology officer Bernard Salha has confirmed that EDF “supports R&D work on sodium-cooled fast reactors and is following developments in this technology“. A player the size of EDF does not take a stake in a project it does not consider industrially credible.
The Normandy region has also come on board as a minority shareholder and awarded a 1.5 million euro grant. The land is due to be purchased in 2026, construction is set to start in 2027 and the site is expected to be delivered by the end of 2028, with production scheduled to start in 2029. In time, around 600 skilled jobs could be created around the Cherbourg-en-Cotentin plant.
A structured financial roadmap towards industrialisation
In December 2024, Otrera had closed its first round of 2.5 million euros. This second round of 17 million euros consolidates the trajectory. Otrera has already announced its intention to launch, by the end of 2026, a new round of at least 40 million euros to finance the TRL ramp-up of critical components, the continuation of engineering studies and the acceleration of the factory project.
This trajectory reflects the financing model that is typical of capital-intensive industrial deeptech: each round funds the next validation step, which in turn unlocks access to the following round. The presence of industrial players on the cap table at every stage reduces the risk perceived by incoming investors and creates an implicit commercial validation. By 2027, once the demonstrator is under construction and the plant launched, the question will be how to finance large-scale industrialisation and the role to be played by the industrial partners already invested, with EDF first among them.
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