Small Modular Reactor Commercialization Act of 2025

Key Points

• Congress would raise the size limit used to define a “small modular reactor” from 300 to 500 megawatts, letting larger designs count as “small.”
• The Energy Department would have to treat more efficient reactors as eligible under certain nuclear liability/capacity rules by increasing allowed output and combined site capacity.
• The Nuclear Regulatory Commission and the Energy Department would have to update their public guidance so their “small” and “micro” reactor definitions match this bill.
• The Energy Department could not block funding help for grid-scale small modular reactor projects just because one reactor unit is between 50 and 500 megawatts.
• The Energy Department would set up a multi-agency working group to speed commercialization, manufacturing, and workforce planning for these reactors, with yearly reports through 2030.

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