Major biofuels producers including ADM, Neste, REG, Shell, POET, Abengoa, & Valero operate facilities generating billions of gallons annually. ADM produces over 1.8 billion gallons of corn ethanol whilst POET exceeds 3 billion gallons across 30 plants. Neste leads renewable diesel production exceeding 3 million metric tons from waste oils achieving 50-90% emissions reductions. REG produces over 500 million gallons of biodiesel from diverse feedstocks. These companies address transportation decarbonization whilst confronting challenges including feedstock competition, policy dependence, & cost competitiveness relative to petroleum & emerging electric vehicles.