 SAN ANTONIO--BUSINESS WIRE--NuStar Energy L.P. NYSE: NS today announced its fourth quarter and full-year 2020 earnings results. As we came into 2020, we had just booked the best fourth quarter in company history and we were expecting a record year. However, by March 2020, the COVID-19 pandemic had devastated much of the global economy, said NuStar President and CEO Brad Barron. Faced with historically difficult conditions, our employees stepped up and through hard work and prudent planni 