Before revision:  We analyze the statistical significance of CO_2 emissions reductions in the U.S  power sector from March through July 2020 and we present model-informed expectations of the likelihood of sustained reductions in CO_2 emissions.
After revision:  We analyze the statistical significance of CO_2 emissions reductions in the U.S . power sector from March through July 2020 and we present model-informed expectations of the likelihood of sustained reductions in CO_2 emissions.