Estimating the Net Energy Balance of Corn Ethanol

Hosein Shapouri , James A. Duffield , and Michael S. Graboski

United States Department of Agriculture

关键词: ethanol;    net energy balance;    corn production;    energy security;   

RP-ID  :  AER-721

学科分类：农业科学（综合）

美国|英语

来源: United States Department of Agriculture Publications

【 摘 要 】

Studies conducted since the late 1970's have estimated the net energy value 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 net energy value of corn ethanol has become positive in recent years 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 ratio of 1.24.