A deep freeze in the USA is taking a toll in the energy industry. Some of the biggest oil refineries in Texas were forced to shut down as an Arctic freeze upended energy markets and led to widespread power blackouts across the country. The deep freeze prompted the state’s electric power suppliers to impose rotating blackouts, leaving nearly 3 million homes and businesses without power. U.S. President Joe Biden has already unlocked federal assistance to Texas, which is one of the biggest gas producing countries and which produces roughly 4.6 million barrels of oil per day.