Small Modular Reactor Commercialization Act of 2025

This bill updates federal definitions and policies to support small modular nuclear reactors (SMRs). It increases the size threshold for SMRs from 300 megawatts to 500 megawatts per reactor unit (and adjusts combined capacity limits), ensuring projects within this range qualify for federal funding. The bill requires the Nuclear Regulatory Commission and Department of Energy to revise their guidance to align with these new definitions and creates a federal working group to assess U.S. competitiveness in SMR manufacturing and commercialization. These changes directly affect nuclear developers, manufacturers, and federal agencies managing energy policy and regulation.