The U.S. is leading the world in small modular nuclear reactor (SMR) development with 28 siting announcements, as of 2026.

This graphic, via Visual Capitalist's Cody Good, in partnership with the National Public Utilities Council, shows which countries are building the most SMRs.

The U.S. Leads Global SMR Development

With 28 siting announcements, the U.S. has more SMR projects in development than the next four countries combined.

Source: The Nuclear Energy Agency

Only 78 of 129 SMR designs being tracked by the NEA are publicly reported in the digital dashboard. The rest have either requested not to be included or are not under active development.

Across the U.S., national laboratories lead in siting announcements (7), followed by a three-way tie among utilities, universities, and SMR developers (5 each).

Why Small Modular Reactors Matter

SMRs are a critical clean-energy technology that are cheaper and more flexible than traditional nuclear power generation.

• Small: SMRs can produce up to 300 MWe, far less than traditional reactors, which typically produce around 1,000–1,400 MWe. 
• Modular: SMRs are designed for mass factory manufacturing to reduce cost and build time.
• Reactor: The four main reactor types are light water reactors, fast neutron reactors, graphite-moderated high temperature reactors, and molten salt reactors.

Their compact, modular design enables easier transport and deployment ideal for data centers or remote sites where grid connection is costly or unnecessary.

The Role of SMRs in the Future of Power

As electricity demand accelerates, SMRs are becoming an increasingly important part of conversations around grid reliability, energy security, and clean firm power. 

For utilities and policymakers, tracking where these projects are emerging can help inform planning, policy, and long-term strategy.