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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE. 46(4): 959–968. (doi: 10.13031/2013.13951) @2003
Authors:   H. Shapouri, J. A. Duffield, M. Wang
Keywords:   Corn production, Energy, Ethanol, Net energy balance

Studies conducted since the late 1970s have estimated the net energy value (NEV) of corn ethanol. However, variations in data and assumptions used among the studies have resulted in a wide range of estimates. This study identifies the factors causing this wide variation and develops a more consistent estimate. We conclude that the NEV of corn ethanol has been rising over time due to technological advances in ethanol conversion and increased efficiency in farm production. We show that corn ethanol is energy efficient, as indicated by an energy output:input ratio of 1.34 and 1.53 under a bestcase scenario.

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