The brief
- PWR-20 is 20 MWe with factory-built modules that assemble on site in roughly 24 months instead of a decade.
- Raised $164M total; Series C of $100M closed December 2025. 10 PWR-20s for Poland, 24 for UK.
- DOE Reactor Pilot Program: targeting first criticality and plant commissioning in Poland by end-2026.
Technical approach
Factory assembly
Modules made in controlled factories
Factory-manufactured modules are pre-tested and fit together like Lego. Quality is higher and assembly faster than on-site construction.
Pressurized water cooling
Proven PWR technology at smaller scale
Standard PWR design, 4.95% enriched fuel, 300°C output, closed-cycle air cooling. No cooling towers or water supply needed.
Rapid deployment
Two-year timeline from factory to power
Modular assembly compresses timeline from 10+ years to 24 months, reducing financing risk.
Industrial heat and power
Target is data centers and heavy industry
20 MW and 300°C heat suit industrial users and hyperscale data centers seeking decarbonization.
