Life cycle assessment of greenhouse gas emissions from plug-in hybrid vehicles: implications for policy.
Plug-in hybrid electric vehicles (PHEVs), which use electricity from the grid to power a portion of travel, could play a role in reducing greenhouse gas (GHG) emissions from the transport sector. However, meaningful GHG emissions reductions with PHEVs are conditional on low-carbon electricity sources. We assess life cycle GHG emissions from PHEVs and find that they reduce GHG emissions by 32% compared to conventional vehicles, but have small reductions compared to traditional hybrids. Batteries are an important component of PHEVs, and GHGs associated with lithium-ion battery materials and production account for 2-5% of life cycle emissions from PHEVs. We consider cellulosic ethanol use and various carbon intensities of electricity. The reduced liquid fuel requirements of PHEVs could leverage limited cellulosic ethanol resources. Electricity generation infrastructure is long-lived, and technology decisions within the next decade about electricity supplies in the power sector will affectthe potential for large GHG emissions reductions with PHEVs for several decades.
Department of Engineering and Public Policy, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213-3890, USA. csamaras@andrew.cmu.edu
Constantine
C
Samaras
Kyle
K
Meisterling
D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution; D002244:Carbon / Q000737:chemistry; D002482:Cellulose / Q000032:analysis; D003246:Conservation of Energy Resources; D011211:Electric Power Supplies; D004560:Electricity; D004736:Energy-Generating Resources; D004784:Environmental Monitoring / Q000379:methods*; D000431:Ethanol / Q000032:analysis; D005579:Fossil Fuels; D017752:Greenhouse Effect; D011640:Public Policy; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D005579:Fossil Fuels; D001335:Vehicle Emissions; D000431:Ethanol; D002244:Carbon; D002482:Cellulose