The US Nuclear Regulatory Commission (NRC) has certified the first small modular reactor (SMR) design, developed by NuScale Power. This design is an advanced light-water SMR that can generate 50 megawatts of emissions-free electricity. The certification allows utilities to reference NuScale's SMR design when applying for a combined license to build and operate a reactor. The NRC's certification is a significant step towards the deployment of SMR technology in the US.