Constellation Energy stands as the largest carbon-free energy producer and the leading nuclear plant operator in the United States. Following its corporate spin-off from Exelon, Constellation manages a massive fleet of commercial nuclear power reactors spread across multiple states, generating vast amounts of reliable baseload electricity for American households and industrial clients. Other major corporate utilities operating extensive domestic nuclear assets include NextEra Energy, Duke Energy, and Southern Company, all playing pivotal roles in regional power grids.