In a deregulated fuels market, biofuels and fossil fuels are close substitutes. Without blend mandates or flexible subsidy schemes, biofuels will lose competitiveness in times of low oil prices or expensive feedstock prices. This paper provides a quantitative outlook of a potential post-mandate era for the US biofuels industry and highlights the importance of focusing on the random nature of feedstock and gasoline prices. The calibrated gasoline/ethanol model predicts that under all likely scenarios the distribution of profits for a representative ethanol unit will be in the range of 2$/g to 2$/g. We also observe that even with a sufficient subsidy to keep the average ethanol price competitive, ethanol plants may shut-down 40%-60% of the time. The skewness of ethanol producer's profit is in the range of 2.3-2.5, in contrast to the 0.91 skewness of corn feedstock prices. We discuss the effects of improved technical efficiency, higher subsidies, willingness to pay, and price volatility on ethanol plant shutdown frequency. A set of possible risk management strategies to protect the biofuels sector in a deregulate scenario is offered. (C) 2017 Elsevier Ltd. All rights reserved.