Plant size: Capital cost relationships in the dry mill ethanol industry

Paul W. Gallagher, Heather Brubaker and Hosein Shapouri

ISU General Staff Papers from Iowa State University, Department of Economics

Abstract: Estimates suggest that capital costs typically increase less than proportionately with plant capacity in the dry mill ethanol industry because the estimated power factor is 0.836. However, capital costs increase more rapidly for ethanol than for a typical processing enterprise, judging by the average 0.6 factor rule. Some estimates also suggest a phase of decreasing unit costs followed by a phase of increasing costs. Nonetheless dry mills could be somewhat larger than the current industry standard, unless other scarce factors limit capacity expansion. Despite the statistical significance of an average cost-size relationship, average capital cost for plant of a given size at a particular location is still highly variable due to costs associated with unique circumstances, possibly water availability, utility access and environmental compliance.

Date: 2005-06-01
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