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Integrated energy, environmental and financial analysis of ethanol production from cellulosic switchgrass

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  • Felix, Erika
  • Tilley, David R.

Abstract

Ethanol production from cellulosic sources such as switchgrass (Panicum virgatum L.) requires the use of natural resources, fossil fuels, electricity, and human-derived goods and services. We used emergy accounting to integrate the ultimate amount of environmental, fossil fuel, and human-derived energy required to produce ethanol from switchgrass. Emergy is the total amount of energy of one form required directly and indirectly to make another form of energy. Forty-four percent of required emergy came from the environment either directly or embodied in purchased goods, 30% came from fossil fuels either directly or embodied in purchased goods, and 25% came from human-derived services indirectly. Ethanol production per petroleum use (emergy/emergy) was 4.0-to-1 under our Baseline Scenario, but dropped to 0.5-to-1 under a scenario that assumed higher input prices, lower conversion efficiencies and less waste recycling. At least 75% of total emergy was from non-renewable sources. Energy ‘hidden’ in indirect paths such as goods and services was 65% of the total. Cellulosic-ethanol is not a primary fuel source that substitutes for petroleum because its production relies heavily on non-renewable energy and purchased inputs. It is a means for converting natural resources to liquid fuel.

Suggested Citation

  • Felix, Erika & Tilley, David R., 2009. "Integrated energy, environmental and financial analysis of ethanol production from cellulosic switchgrass," Energy, Elsevier, vol. 34(4), pages 410-436.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:4:p:410-436
    DOI: 10.1016/j.energy.2008.10.013
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