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Research Article

Valuation of plug-in vehicle life-cycle air emissions and oil displacement benefits

Jeremy J. Michalek, Mikhail Chester, Paulina Jaramillo, Constantine Samaras, Ching-Shin Norman Shiau, and Lester B. Lave
  1. aEngineering and Public Policy, Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213;
  2. bSchool of Sustainable Engineering and the Built Environment, School of Sustainability, Arizona State University, Tempe, AZ 85287;
  3. cEngineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213;
  4. dRAND Corporation, Pittsburgh, PA 15213;
  5. eMechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213; and
  6. fEngineering and Public Policy, Tepper School of Business, Carnegie Mellon University, Pittsburgh, PA 15213

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PNAS October 4, 2011 108 (40) 16554-16558; https://doi.org/10.1073/pnas.1104473108
Jeremy J. Michalek
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  • For correspondence: jmichalek@cmu.edu
Mikhail Chester
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Paulina Jaramillo
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Constantine Samaras
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Ching-Shin Norman Shiau
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Lester B. Lave
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  1. Edited by Stephen Polasky, University of Minnesota, St. Paul, MN, and approved July 26, 2011 (received for review March 22, 2011)

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Abstract

We assess the economic value of life-cycle air emissions and oil consumption from conventional vehicles, hybrid-electric vehicles (HEVs), plug-in hybrid-electric vehicles (PHEVs), and battery electric vehicles in the US. We find that plug-in vehicles may reduce or increase externality costs relative to grid-independent HEVs, depending largely on greenhouse gas and SO2 emissions produced during vehicle charging and battery manufacturing. However, even if future marginal damages from emissions of battery and electricity production drop dramatically, the damage reduction potential of plug-in vehicles remains small compared to ownership cost. As such, to offer a socially efficient approach to emissions and oil consumption reduction, lifetime cost of plug-in vehicles must be competitive with HEVs. Current subsidies intended to encourage sales of plug-in vehicles with large capacity battery packs exceed our externality estimates considerably, and taxes that optimally correct for externality damages would not close the gap in ownership cost. In contrast, HEVs and PHEVs with small battery packs reduce externality damages at low (or no) additional cost over their lifetime. Although large battery packs allow vehicles to travel longer distances using electricity instead of gasoline, large packs are more expensive, heavier, and more emissions intensive to produce, with lower utilization factors, greater charging infrastructure requirements, and life-cycle implications that are more sensitive to uncertain, time-sensitive, and location-specific factors. To reduce air emission and oil dependency impacts from passenger vehicles, strategies to promote adoption of HEVs and PHEVs with small battery packs offer more social benefits per dollar spent.

Footnotes

  • ↵1To whom correspondence should be addressed. E-mail: jmichalek{at}cmu.edu.
  • Author contributions: J.J.M., M.C., P.J., and C.S. designed research; J.J.M., M.C., P.J., C.S., and C.-S.N.S. performed research; J.J.M., M.C., P.J., C.S., and C.-S.N.S. contributed new reagents/analytic tools; J.J.M., M.C., P.J., C.S., C.-S.N.S., and L.B.L. analyzed data; and J.J.M., M.C., P.J., C.S., and L.B.L. wrote the paper.

  • Conflict of interest statement: The corresponding author has received research funding from Ford Motor Company and Toyota Motor Corporation; however, these funds were not used to support the research presented here, and these organizations did not participate in proposing, defining, guiding, supporting, or evaluating the research presented here.

  • This article is a PNAS Direct Submission.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1104473108/-/DCSupplemental.

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Valuation of plug-in vehicle life-cycle air emissions and oil displacement benefits
Jeremy J. Michalek, Mikhail Chester, Paulina Jaramillo, Constantine Samaras, Ching-Shin Norman Shiau, Lester B. Lave
Proceedings of the National Academy of Sciences Oct 2011, 108 (40) 16554-16558; DOI: 10.1073/pnas.1104473108

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Valuation of plug-in vehicle life-cycle air emissions and oil displacement benefits
Jeremy J. Michalek, Mikhail Chester, Paulina Jaramillo, Constantine Samaras, Ching-Shin Norman Shiau, Lester B. Lave
Proceedings of the National Academy of Sciences Oct 2011, 108 (40) 16554-16558; DOI: 10.1073/pnas.1104473108
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