Why Heavy Hybrids?
 A productive, innovative trucking industry is essential to our economic prosperity. Approximately 80% of the total quantity of goods included in the United States gross domestic product are transported by various classes of trucks. Therefore, satisfying truck transportation energy requirements for goods transport and for services is critical. That's why the U.S. Department of Energy (DOE) started the Advanced Heavy Hybrid Propulsion System (AH2PS) Project in 2000. Led by NREL, this project aims to increase vehicle efficiency and decrease emissions by advancing next-generation heavy hybrid technology.
 According to 1997 figures, the approximately 5.5 million Class 3-8 commercial trucks constitute one of the fastest growing energy use transportation sectors. These trucks use approximately 22.9 billions gallons of fuel annually. All Class 1-8 truck energy use accounts for all of the increase in highway transportation energy use in the last 30 years. This contributes significantly to our nation's reliance on imported oil and threatens national security. A major goal of the AH2PS is to significantly reduce U.S. dependence on imported oil.
Advanced heavy hybrid vehicles will likely be commercialized in several vehicle classes later in this decade. They will significantly improve fuel efficiency and reduce vehicle emissions. See the Statement of Work for examples of salient technologies.
In concert with the AH2PS technological advancements, DOE initiated other activities to develop essential power systems and truck electrification to more efficiently manage electrical, mechanical, and thermal power on trucks. These activities are expected to provide a pathway for truck electrification that complements the AH2PS project. DOE also has ongoing projects in diesel engine research, exhaust aftertreatment, heavy vehicle systems research (aerodynamic drag, friction and wear, thermal management), and materials.
For more information about the AH2PS project, check out About the Project.
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