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The Energy Balance of Corn Ethanol: An Update

Author

Listed:
  • Shapouri, Hosein
  • Duffield, James A.
  • Wang, Michael Q.

Abstract

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.

Suggested Citation

  • Shapouri, Hosein & Duffield, James A. & Wang, Michael Q., 2002. "The Energy Balance of Corn Ethanol: An Update," Agricultural Economic Reports 34075, United States Department of Agriculture, Economic Research Service.
    • Handle: RePEc:ags:uerser:34075
    DOI: 10.22004/ag.econ.34075
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    References listed on IDEAS

    as
    1. Dovring, Folke & McDowell, Donald R., 1980. "Energy Used for Fertilizers," Illinois Agricultural Economics Staff Paper 243896, University of Illinois at Urbana-Champaign, Department of Agricultural and Consumer Economics.
    2. Ali, Mir B. & McBride, William D., 1994. "Corn: State-Level Production Costs, Characteristics, and Input Use, 1991," Statistical Bulletin 154831, United States Department of Agriculture, Economic Research Service.
    3. Taylor, Harold H., 1994. "Fertilizer Use and Price Statistics, 1960-93," Statistical Bulletin 154834, United States Department of Agriculture, Economic Research Service.
    Full references (including those not matched with items on IDEAS)

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