As a result of several U.S. refinery closures in 2020, U.S. operable atmospheric crude oil distillation capacity, the primary measure of refinery capacity in the United States, dropped 4.5% to a total of 18.1 million barrels per calendar day (b/cd) at the start of 2021. The end-of-year 2020 total is 0.8 million b/cd less than the 19.0 million b/cd of refining capacity at the start of 2020. According to the data in our annual Refinery Capacity Report, the beginning of 2021 marks the lowest annual capacity figure to start the year since 2015. Based on information reported to us in our recent update, U.S. refining capacity will not expand significantly during 2021.