Calogena Lands €40M EU Grant for First Commercial Nuclear Reactor

French nuclear startup Calogena has secured a €40 million grant from the European Commission's Innovation Fund to build its first commercial small modular reactor (SMR) in Pierrelatte. It's the first time European funding has gone to an SMR earmarked for the direct construction of a commercial facility.

The reactor will supply low-carbon heat to district heating networks, not electricity. "This funding marks a major milestone for Calogena. Having developed our technology and brought it to industrial scale, we are now entering the construction phase of our first commercial reactor," said Julien Dereux, Executive Chairman of Calogena.

Who is Calogena?

Groupe Gorgé, a Paris-based high-tech industrial group with roughly 3,500 employees and €600 million in revenue, founded Calogena in 2021 as a subsidiary. The startup is developing a 30-thermal-megawatt, water-cooled SMR built specifically to decarbonise district heating networks.

The design leans on pool-type research reactor technology, a configuration already proven in hundreds of installations worldwide. It runs at 100°C and 6 bar — less pressure than a bicycle tyre — which the company says makes it simpler and safer to operate than conventional power reactors.

The unit's footprint is compact. It needs just 3,000 square metres of land and under 1,000 square metres of building. It doesn't require major water or electricity supply, and refuelling takes one lorry delivery every two years. Each module can heat around 20,000 households and produces less than 80ml of nuclear waste water over its lifetime.

What does the €40 million pay for?

The grant funds construction of Calogena's first commercial reactor in Pierrelatte, which will serve as the company's inaugural commercial reference project. The town will get locally produced, low-carbon heat — an alternative to the carbon-intensive, largely imported energy sources that currently account for nearly one-third of Europe's total energy demand.

The EU money follows more than €50 million Calogena has already raised under France 2030, the national industrial strategy programme that helped bring its technology to industrial readiness.

"The European Commission's support confirms the maturity of our project and its potential to address one of Europe's major energy challenges: producing local, low-carbon, cost-competitive heat at scale while strengthening energy sovereignty. Pierrelatte would be our first commercial reference and should pave the way for wider deployment across Europe," Dereux added.

Where next for the SMR maker?

Beyond Pierrelatte, Calogena is pursuing projects across Europe. It's in contention to supply more than fifteen reactors in Finland, where it opened a subsidiary in 2025. In June, it signed a cooperation agreement with Veolia, a European leader in district heating, to explore SMR deployment across Central and Eastern Europe.

The commercial case rests on scale. The European district heating market is projected to reach around 1,000 TWh by 2050, and Calogena argues its technology can deliver price-stable heat over the long term while reinforcing energy sovereignty.

The timeline is set. Calogena is targeting initial deployments from 2030, with the first commercial reactor in Pierrelatte scheduled to go live in 2032. If that reference plant performs, the company will have a template for the pan-European rollout it's already lining up in Finland and with Veolia.