List of Small Modular Nuclear Reactor Developers

Small Modular Reactor Developers: The New Nuclear Landscape

The SMR sector has entered a decisive phase. With over 80 reactor designs under development across 18 countries, the question has shifted from whether SMRs will be built to which designs will capture market share first. For utility planners and investors, understanding the competitive landscape is essential to making informed deployment and portfolio decisions.

Market Leaders and First Movers

NuScale Power holds a unique position as the only SMR developer with a fully certified design from the U.S. Nuclear Regulatory Commission. Their 77 MWe light-water module scales from 308 MWe (4 modules) to 924 MWe (12 modules). In September 2025, NuScale announced a landmark 6 GW deployment program with ENTRA1 Energy and the Tennessee Valley Authority.

GE Vernova Hitachi Nuclear Energy is advancing the BWRX-300, a 300 MWe boiling water reactor leveraging the licensed ESBWR design basis. Construction of the first unit began in May 2025 at Ontario Power Generation's site in Canada, with completion targeted for late 2029.

Rolls-Royce SMR secured selection by the UK government through Great British Energy in June 2025 for domestic deployment of its 470 MWe pressurized water reactor.

Technology Diversity

Light Water Reactors

NuScale, BWRX-300, Rolls-Royce SMR

High-Temperature Gas-Cooled

X-energy Xe-100 — TRISO fuel, process heat up to 750°C

Sodium-Cooled Fast Reactors

TerraPower Natrium, Oklo Aurora

Molten Salt Reactors

Terrestrial Energy IMSR, Kairos Power KP-FHR

Big Tech Driving Demand

Amazon: 5+ GW of X-energy capacity. Google: 500 MW with Kairos Power. Meta: 6.6 GW deals with Oklo and TerraPower announced January 2026.

Global Deployment Status