We present a novel method to infer CO₂ emissions from individual power plants, based on satellite observations of co-emitted NO₂. We find that the CO₂ emissions estimated by our satellite-based method during 2005–2017 are in reasonable agreement with the CEMS measurements for US power plants. The broader implication of our methodology is that it has the potential to provide an additional constraint on CO₂ emissions from power plants in regions of the world without reliable emissions accounting.