48 1ST 2ND 3RD 4TH Improvement in Mechanical Availability Industry Benchmark Quartiles 2018 2008 Mechanical Availability In 2021, we achieved 97.2% mechanical availability, continuing our strong performance in avoiding unplanned downtime, minimizing environmental events and successfully executing planned and unplanned refinery maintenance in a timely manner. Highly reliable refinery operations are essential to curbing environmental incidents and improving safety. Our capital investments in reliability, along with our program of comprehensive reliability assessments and proprietary management systems, have also contributed to consistent process safety performance excellence. We also achieved a record low refinery Tier 1 Process Safety Event rate of 0.05 events per 200,000 working hours in 2021. The Tier 1 process safety rate is the American Petroleum Institute’s measure of recordable safety incidents occurring in conjunction with a loss of process containment. Industry benchmarking and Valero’s performance statistics from Solomon Associates and Valero. 2018 is the most reliable industry data set, as the results of Solomon’s 2020 Fuels Study were impacted by COVID-19-related demand destruction.