We determine the change in air pollution damages from U.S. power plant emissions over 2010 to 2017. Annual damages fell from $245 billion to $133 billion over this period, with most of the decline occurring in the East. Decomposition shows that changes in emissions rates reduced damages by $63 billion, changes in generation shares reduced damages by $60 billion, and a reduction in fossil generation reduced damages by $25 billion. However, changes in damage valuations per ton of emissions increased damages by $35 billion. We estimate that marginal damages declined in the East from about 9¢ per kWh in 2010 to 6¢ in 2017. This decrease is slower than the decrease in total damages. Despite little or no change in total damages in the West and Texas, marginal damages increased. The environmental benefit of electric vehicles increased so that they are now cleaner than gasoline vehicles on average, though substantial
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